Finally, a reliable inexpensive RAM upgrade for the Atari ST! (That you can make yourself)

well hello everyone and welcome back to adrian's digital basement on today's video we're going to be revisiting the old atari 520s t there's been several parts to this video so if you haven't been following along i recommend you look below in the description i'll have links to all the previous videos because it's a good idea to catch up before you watch this one in fact it's been a little bit of time since i made the last video on this machine and i myself had to go back and review my own video to see what was up next for the repairs on this so with the st in today's video we're going to be installing a new ram expansion card probably the most reliable ram expansion possible for the 520 we'll be checking out this cartridge that came with this machine it's called the desk cart from qmi i'll also be finishing up that disk drive which is sort of disassembled after trying to get it working on the last video and also if there's time be testing out some software on this thing so without further ado let's get right to it [Music] all right the pretty much left for dead atari t i retrobrited this case in a previous video when the weather was more amenable to that outside and it really did come out great there's absolutely no flaws whatsoever with the case it's a little bit dusty because it's been a few months the keyboard on the other hand of course i did not attempt to retrobrite and that's gonna have to wait until well maybe i can break out the old blue box i'll put a link in the description to that if you haven't seen my videos on that but it's a box with some leds that seems to do a pretty good job retrobriting but ultimately i prefer to do it outside in the sun and here in oregon where i live well it's winter time that means there's really not much sun to be had and there's definitely no warmth which helps with the retrobrite process so for now i will just be living with this two-tone look to the old 520 st which while looks weird i actually don't mind it so much now as a bit of an upgrade i actually have the st connected to the open source scan converter using a couple cables that i made plugged into the back of the machine so i can actually do video captures from the st which is awesome i even went so far as to add an rca audio output from the cable because this particular st doesn't have rca jacks on the back as you can see the machine is still booted up and it's working perfectly after the repair i did in a previous part as a quick refresher the mmu chip in this machine actually went bad in addition it had a ram expansion which is in here we'll look at that in a second which required a couple traces to be cut on the board so in addition to that new mmu that works again i had to undo the mods that were required to make this ram expansion work so the computer is still working great so thumbs up to that so i never put the case screws back in this so we can just lift the hood to get access to this machine and there it is the motherboard of the early versions of the atari st it only has the capability of having 512k on the motherboard later machines or later versions of the 520st actually had two rows of chips and sometimes they were in different positions on the motherboard where you could actually upgrade the board by removing the solder and installing a second set of chips which would at least turn your 512k machine into a 1020 4k machine this is the memory management unit that i replaced on this st which made it work and if we take a look at the schematics for this machine here is that mmu chip now one thing that's kind of cool is even though atari only sold this machine originally with 512k they actually designed the memory management chip with four megabytes capability in mind and if we look at all the signals that come out of this chip there are two things that are responsible for allowing it to support up to four megs of ram now first off there's only 512k on this schematic just like what matches on this motherboard right here you have the address lines that go to the ram chips and you can see zero through eight are actually connected but notice there is an address line 9 sick pin 64 on the mmu that's not connected at all and then if you look down here you see these raz and kaz lines well ras0 and cast 0 high and low are for addressing the first bank of memory which is really the first 16 chips on the motherboard as seen on this particular 520. there's actually a ras one and a cas one high and low which isn't connected as well and that is to support the second bank of memory now keep in mind this is a 16-bit machine which means you need 16 chips to equal one bank of memory and eight of those chips each is connected to cash high and the other eight to cash low so the way it would work on an st that supported a one meg right on the motherboard is it would have a second set of ram chips connected to raz one and these two kaz lines that's the second bank of 512k totaling one make if atari had only supported the second bank with these raz and kaz lines then the most memory that would be possible to support on any st that uses this mmu would be one megabyte but the fact is this extra address line is sitting here and when you hook up this extra address line to appropriate ram chips you actually quadruple the capacity of that bank of ram which would turn this 512k into two megabytes but of course you need larger capacity ram chips which have a different pin out so you can't just install those on the motherboard i'm pretty sure that some smart hardware hacker back in the day figured out how to piggyback a second set of 512k of ram on top of these and you would just need to run the extra raz and kaz lines lifting them from your soldering job and running those barge wires over to the mmu probably some points on the motherboard and then you have to connect all those lines together that would enable this thing to have one meg of ram right on the motherboard so that brings us to this st ram upgrade fragile so this is the marpit ram upgrade that was in this machine when i got it so i wrote fragile because this thing is super fragile and it's actually funny about the way that these ram upgrades all seem to work on the st so obviously right here we have four megs of memory and due to these fragile sim sockets there's like a lot of hot glue or whatever to hold that together but this ram board is literally only holding this ram it doesn't really do much you have to interface this memory with what's on the motherboard obviously when you have four memory modules installed in here that's taking up both banks of memory that the mmu supports so the onboard memory does need to be disabled and that was done by cutting those traces which i have since reversed and i did that on the back of the motherboard but to use this memory expansion you have to connect the ram to a couple different things you have to connect it to the data bus so that's all 16 data bus lines on the atari st you have to connect it to the address bus and that again are these address bus lines seen on the mmu here and then you also of course need to hook this up to the raz and the kaz lines and that's both sets of them because there are two banks of memory here so that is these lines right here on the mmu well you notice that this ram expansion has these two boards on the end of these ribbon cables the first one here has a 40 pin dip socket on it and the equivalent pins on the bottom that plugs under this chip here which is called the shifter chip this is the graphics chip so to speak on the st it interfaces directly to the ram so it has access to all 16 data bus lines so you simply lift this chip out of the socket and install this into there and that gives this ram board here access to all the data bus lines it needs but this chip does not have access to the address bus lines that the mmu generates for the memory and to get to that this board was created i think i talked about how this works in the video where i removed this thing but i understand it a lot better now than i used to so if you notice this little pcb has these very thin pins here and the idea is you push this these pins and this little circuit board over the mmu the idea are these pins are supposed to go between this plastic outer shell and these metal contacts that contact this plcc chip the problem though is that these plcc sockets and the pins in here are very fragile and any kind of damage that you cause to these pins will create a non-functional atari st in addition any contact problems from these pins and the mmu socket and the mmu chip are going to cause problems because basically this thing is talking directly to the ram on those address lines and those razz cast lines and you need those signals to be very clear without any integrity issues or you're of course going to have issues and crashes and other problems to make matters even worse is atari used non-standard plcc sockets now a viewer donated several sockets and ships for me to repair atari's in the future and in his little package of connectors are two of the plcc sockets now this is one that could replace this one if it were bad luckily it's not and the reason that these are non-standard is the pin spacing every other plcc socket i've ever seen has pins that are arranged in rows around the edges this thing has a staggered layout you're probably not gonna be able to see it very easily but the pins go back and forth in a zigzag motion around the sides completely different and incompatible with every other socket that you could still easily buy today for very little money so i'm holding on to these two rare plcc sockets here along with some of these other weird din sockets used for i think the floppy drive and stuff like that for the day i ever have to replace or repair an st and change out this socket especially if it's been damaged by a ram expansion board like this one now it's pretty much my understanding that all st ram expansions work this way well not all but almost all just be because this is a way a user could actually do the install themselves the 40 pin ribbon cable here is very easy but i can imagine many a user tried to install one of these boards themselves by pushing this over the mmu and damaged the socket rendering their st broken but unfortunately the alternative would be you'd have to solder wires for each of the address lines and all the razz cast lines to various points on the motherboard like around these resistors and it would just be a bit of a mess it'd be totally doable but you'd have to know exactly what you were doing with the exact revision of st motherboard because as i mentioned atari moved things around a lot like sometimes the rams over here sometimes there's two banks there are many permutations of these motherboards therefore those connection points move around this ribbon cable thing just means you plug this in you plug this in i think you hook up this ground line and it should work now after i talked about the fact that i would probably try to reinstall this in the machine i had many viewers reach out to me and say do not do that you're just asking for problems of course i could damage this socket and most likely it's going to result in an unreliable atari st especially over time if it gets jostled or bumped it'll just stop working so this is where one of my viewers steve from the uk comes in he went ahead and sent me this which is an open source ram expansion for the atari st will bring it up to four megabytes of ram and it's soldered into the machine in a way that a won't risk any damage to the mmu and b also will never come out besides the fact that this board is not going to get come loose and cause crashes the negative about it is you have to remove all the ram on the motherboard before you can install this into the same place on the board where the ram is so it's going to look like that one is done but of course i have the arduous task of removing these 16 ram chips and because this plugs into the existing holes on the motherboard there are signals that aren't available and if we go back to the schematics we can imagine right here it's going to be this ninth address line along with the raz one and kaz one lines well there are holes right here where i'm gonna have to solder wires for four connections from there to a couple points on the motherboard to bring those signals into this board there's a couple of minor problems with this ram board if you download from github it will outline those on the project you have to swap well i guess i would swap the wires that go to cas1l and h so that's just mislabeled also there's a missing trace that goes from that pin on that ram chip over here to this pin on that ram chip so i'm just going to have to add a barge wire after i am done with the installation and the only other potential issue is after this is installed it'll have a permanent 4meg ram upgrade i'm thinking that i could probably disable half the memory by i think rat taking the ras line off and bridging it to 5 volts or basically pulling it high for these two ram chips and that should have the effect of completely disabling at least 2 megabytes of the memory i've heard there are some pieces of software that don't like having 4 megs of ram and won't run but i think pretty much everything will work fine with two megs of ram although i'm not totally sure about that so i think it's time to take this motherboard out of here and start taking these chips out i'm gonna do a time lapse for the removal of the chips desoldering this many ics and pins is not for the faint of heart a total of 256 pins across all of these chips make sure you have a really good desoldering iron and your technique is rock solid otherwise you do risk causing damage to your board i have to admit the hakko 301 i'm using gets a little heavy in your hand when you're holding it for this long i'd probably benefit from having to desolder an iron where the main suction is external to what you're holding so it's not quite so bulky and heavy what i'm doing at this point is after i desoldered one set of pins i go back with the desoldering iron and i just sort of pushed the pin away from the via because a lot of times the pin will stick with a little tiny bit of sour that's left and when you just push it away with some heat you'll feel it tick and kind of release itself that just helps remove the chip later now i'm working on the little ram expansion board steve had actually soldered in some pins for me to keep them from falling out i guess during shipping but the problem is is they were all crooked and i can't get them into the board like that so i had to remove all of them all right i am ready to go for installing this board finally that was quite an arduous task getting the ram out of the motherboard actually wasn't too difficult but i really don't recommend you try this unless you have a really good desoldering equipment if you try to do this with soldering braid you will be in for a world of hurt if you don't have something like a hakko d soldering iron or something else what i recommend you do is if you're really gonna do this with no turning back basically take some snips like these and cut along the top of the chip to remove the package that will leave just these pins behind in the motherboard and then what you can do is you can take your soldering iron a pair of tweezers and then pull each one out carefully but you're still going to have to clean up all the holes on the motherboard but once the package is out the soldering braid desoldering braid that is should work okay next up is the ram expansion board i had to remove all of these pin headers that steve had soldered on he had only put them on bot with one pin on every single one of them but the problem is is they are all a little bit crooked and ideally the way i see this working is it's best to put all the pins into the motherboard and then without soldering anything down put the ram board on top of them that way you can angle and adjust them all so it fits perfectly and then basically go ahead and solder all the rest of the connections unfortunately these are the thick pin or the square pin type of headers and they just fit in very tightly into this pcb so desoldering them was actually pretty difficult i might have spent not quite as much time as i did on the ram but yeah a good amount of time on that this is what i'm going to be using to attach this to the motherboard these types of pins are much smaller and more forgiving with the positioning and that should allow getting this into place a lot easier so let's proceed with the time lapse installation i made a last-minute decision to install sockets first in the motherboard so that's what i'm doing here and the plan is to put the sockets in but not solder them in and then push all of the necessary pins into the sockets which should hold them up and align them and then put the ram expansion pcb over those sockets and with everything not soldered in i should be able to jiggle it around and get those pins aligned properly into all the holes getting the pins to actually go into the pcb was a little bit of a trick requiring quite a lot of fiddling and bending of the ram board as i started on the left side and tried to get the pins in and then slowly made my way through all the way to the right side using a little pick or a small screwdriver in this case to actually adjust the pins so they would go in it was all very difficult and very fiddly i had my water bottle at hand so i stuck that on top of the board so that it would hold it in place while i started soldering just some of the pins on the top side to keep the port from moving and all the pins coming out a little blue tack on both sides held the board to the motherboard so i could flip it over and at least solder some of the pins to the sockets on so that i could keep it from all falling apart and having to redo all the alignment again it was important for me to make sure that the sockets were getting soldered down flat onto the motherboard so i would solder one pin and then i would reach underneath and sort of bend and push the socket into the board with my other finger and then re-melt that one pin so that the socket would be flat against the motherboard at this point everything is held in with at least one pin on each socket so now it's time to go through and solder everything on completely so that all the pins will be fully connected again [Music] it's now time to connect those extra signal wires from the ram board to the motherboard and i'm also referencing the original documentation steve sent to connect that barge wire between the ram chip and that one pin to replace that missing trace i'm using my cheap hot glue gun to just dab little bits of hot glue to hold that barge wire down into place and now just the final connections between those razz kaz lines and a point on the motherboard all right the installation is complete the board's looking good installed on the atari st now i decided to go with sockets i just couldn't bring myself to permanently installing this into the motherboard and with sockets i can always remove this if something's wrong or whatever and go back to regular dram chips these are the ones i took out of the board installation of this board was definitely pretty fiddly i have to say that a more universal and easy to install solution would probably be a combination of both this market board specifically something to go under the shifter chips here to access the 16 data bits and then you would only need to really connect up to these two sockets to get all the address lines and the kaz raz lines and to be honest all you really need is one of the sockets actually to get all the address lines because those are shared across every chip here and then you would just have to run barge wires to the razz kaz lines on that chip and also on the underside of the mmu to get these extra lines now i used really thin wire wrap barge wire here and i was able just to run it through the little holes that are in this ground plane right there so that's what i decided to do i know that another solution would just be to run it through that hole right there but it's a little tighter there because there's a screw stand off that sticks through there when you install the motherboard and this way it's just right there and it's nice and neat now what i have done if we flip this over we can see this is these barge wires here actually aren't connected to the mmu yet the raz and kaz lines i just connected those right to 5 volts that's going to keep those high and keep that bank of ram completely disabled and i also connected address line 9 which is what enables it to go from 512k per bank to 2 megs per bank i connected that right to ground so that's just basically going to keep this machine right now this should show up as 512k again so i think at this point it's time for testing and uh let's get everything hooked up let me do a quick test without the keyboard or the disk drive just i have the power and the monitor connected here we go all right we got a white screen oh look it's working everyone it came up all that manhandling of this motherboard and this this um this ram board i was like bending it to get it in i was sort of afraid that it wouldn't work but it's working okay great sign let me grab the disk drive all right try number two let's turn on the floppy drive i do have it plugged into the in port this time not like the the mistake i made last time power on the atari um i got no floppy drive on the desktop and that is simply because i did not plug in the power supply for the disk drive this bird's nest cables definitely is a detraction from using these earlier ataris i don't know if the disk drive is on maybe maybe not let's try again all right it's access scenes good sign i have a floppy disk here labeled atari st utilities not quite sure what's on here so we'll stick this in all right so it's booted up again and the mouse is not working is this because the keyboard is not connected maybe let me connect up the keyboard to see if that is somehow related i don't recall that to be the case i know that without the keyboard connected the machine beeps continually once it's booted up but uh obviously i don't have a speaker hooked up oh what just happened there what is happening it's like crashing now hmm boy we're having issues here unplug the keyboard let me fiddle around here see if i can get this thing working okay without the keyboard connected it boots straight up into the toss desktop there let's try it with the keyboard again holding it above the machine so it's not shorting or anything uh oh and the mouse works all right um so who knew that you need the keyboard to get the mouse working i mean i know on later st's the keyboard and the mouse are the same the mouse actually plugs in on the underside of the keyboard but on this original when the joystick ports are on the side of the machine all right i have sysinfo.prg here let's run this and the machine is crashing okay let's try the ram tester nope the ram tester needs to be in the medium resolution as well so let me change it all right well anytime i try to go to set preferences oh there we go the machine is definitely unhappy it keeps crashing let's see if it actually stays in medium resolution nope so all is not well with this machine all right i think it's time to check my work here maybe the way i've hooked up the raz and kaz lines or didn't hook them up is making this whole thing somewhat unhappy just checking that the barge wire that i installed is in the right spot and it is it goes from there to the ninth pin over from here which definitely matches what's on here okay okay so i've hooked up this board fully and no more funny bypass although i did install this switch here you're probably wondering what the heck is this all about well i took the address line 9 and i ran it through this switch and then goes back and right here onto the board where it's supposed to go and then there's one side of the switch that also goes to ground so with one position you're actually hooking up address line nine to the mmu and the other position you're going to be grounding it that should have the effect of running this machine at four megabytes or when you switch this it should be one megabyte and here's the bottom of the board so all four lines are now hooked up this is the address line nine right there and then these are the raz cavs and uh well the two kaz lines and then the raz line that blue wire there and there's one over here that was from last time repairing the cut traces on the top side of the board when they installed the marpit ram upgrade i do have to add that this board plugged into the round hole sockets is really sturdy like i can i can lift the whole board from the ram expansion this is not going to come out accidentally from these sockets so let's plug everything back in and see if this machine is working any better certainly a little concerned that it was acting so crashy and weird especially because i think the way i had hooked up before should have worked without issue it's a little hard to get it all in frame here the keyboard is connected it's just off to the side here as is the mouse power monitor and the floppy drive and here's the floppy drive okay let's turn it on see what happens okay it booted up now you notice it's in medium resolution and you can ignore that it's a little hard to read some of the pixels that's just because i don't have the open source scan converter set up exactly right i used my other st to set the desktop up in medium resolution and then i saved the desktop so that means it boots up into this resolution okay so let's see what sysinfo says in if it runs at all floating oh hey look at that it actually ran all right so look it says one megabyte right here if i scroll over there there's one megabyte total so that the up position on this switch here is actually one so i am just gonna draw a little one here and a four and i'm going to use this little sharpie here to uh draw a little arrow there we go just uh from my reference all right so let's power this off and switch this over to four turn it back on all right well it booted up i'm still not really confident in the reliability of this machine not sure what was going on with that crashing like i said all right there it is four megabytes actually says four mags that is cool uh right mouse button for menu all right let's uh exit out of here and try to run the ram test yet another ram tester all right test low memory first just to make sure that the program itself can run and then you just push a key on the keyboard and it starts the full ram test so i'm going to leave this here and i'll capture the video and we'll let it run through a few cycles of this test it's going to take a lot longer obviously with four megs of ram than when i ran this test last time okay that just crashed right out of there okay that's not reassuring especially because why would it crash out when the program loaded what the heck is going on okay now i wait what i can't click on anything okay i was able to run the ram tester again but i was trying to run the the assist info just so we could see what the memory shed and that wasn't running let's try running this again what the heck is going on all right well now it's already gotten further with this ram test than it did that first time when it it out but the fact that this crashed out like that is really not reassuring i never had that problem on this machine before i didn't really show this on video but i actually did try some games on this computer and they absolutely worked perfectly and i didn't just run them for like a minute i actually played for 20 30 40 minutes i don't really remember i sat down and had a little gaming session without any issue with this machine it was working flawlessly so the ram test is still actually working so i'm just going to let it run and i'm going to step away and i'll come back and see if it's on pass number two i just came back downstairs and i see it's still on the first pass it really does take a lot longer with this four megabytes in here so and it currently says zero errors but yet still working so these kinds of weird randomy problems like i didn't even touch this machine i didn't bend the board so if it's like a bad contact i just simply reset it and that's what we're doing right now and it's working these types of weird intermittent issues wreak of one thing to me power supply and i haven't opened the power supply or looked inside maybe there's some capacitors that are leaking in there and it's not quite working perfectly well i have had some experience before where i powered up an old computer that hadn't been used in a long time and everything was working perfectly and then over time as in there wasn't that much time from when i started using it i started noticing that the machine was crashing and acting weird and i opened up the psu as a pc on the inside and sure enough several of the main filter caps had started leaking inside and actually what kind of clued me into that being the problem is i actually heard a little bit of like a hissing sound when the machine was running and maybe possibly that's gone on with this st power supply it's sitting up here that basically was working fine but then me starting to use it it kind of warmed it up and those caps started leaking and maybe they're having issues possibly okay so i notice here on the ram test we're on pass number two that means that all this four megs of ram is working these chips are working so it really has me confused about what is happening because i think if these ram chips were bad or something let me um let me just bump on this a little bit i'm just going to tap on the ram card here while it's running the ram test see if it crashes out no it's not it's fine it's still running without issue move these cables around maybe this power connector all right well let me reboot out of this and let's see if we can move back into toss let's try running something let's try sysinfo i mean it works i don't fully trust this thing let's uh let's turn this off switch back to one meg power this back on i lost the video signal that happens occasionally that's the open source gang converter gets a little confused by the atari signal all right sis info again okay that worked let's see i'm going to turn it off let me just pick this motherboard up bang it around a little bit push down on things see if that makes the difference here let's see what happens well loaded right into toss but it was doing that even from the very start it just works i mean i think everyone saw right i'm not imagining that earlier on in the video when i had this all hooked up for four megabyte operation it definitely was crashing out right and then it just stopped let's switch over to virtual bench here and i have the multimeter probes here let's hook these up and see what we got on the power rail here there's a main cap all right we're getting 4.86 volts on virtual bench that's not bad i mean that's not too low it's low-ish but it's certainly not on the low on the too low side now this st has a somewhat beefy 470 microfarad cap right here doing the bulk of the 5 volt filtering there's also bypass caps around the board like for each of these ics here it'll be between the 5 volt and the ground this board as well has bypass caps for these two ram chips not to mention on the motherboard itself where it's getting power from these two spots right here there's also bypass caps so i'm definitely at a loss as to what's going on let's uh let me power cycle the computer again while we switch back to four megabyte mode just see what happens here when i turn it back on is this gonna be reliable i mean i just don't like these types of problems yeah it's working i just hate problems like this where things aren't working quite right and then seemingly they're fixed that makes no sense to me and that's very frustrating so i think at this point i'm just going to reassemble this back into the case i'm going to put the disk drive back together so that's not hanging out like this because this drive seems to work perfectly there's no issues with that i can tell and then let's try running some software on here and with the motherboard back in the case and the rf shield on the computer still showing four megs of ram it booted right up it didn't crash or anything and i was about to screw the motherboard in but i just had a horrible thought that what if the keyboard won't fit in the case because the keyboard rests right here over the motherboard what if this ram board is too tall now because i didn't put it directly onto the motherboard i put sockets that would completely completely suck i guess all i can do is try it out oh boy here we go [Laughter] it does not go into place oh no i gotta say i am not undoing all the work i did on this machine if this cannot fit it could be that it's simply the switch looks like that toggle switch i installed there for the uh four or two megs is the problem so i'm just going to move that down here onto the board it's just hot glued in place wow the hot glue is strong let's just disconnect this and let's just pull this up here all this hot glue on here it will come off with alcohol i'm temporarily just going to stick this the thing down here i guess whatever out of the way nope oh man oh man it does not fit in this case the i could see the ram chip is hitting the bottom of the keyboard when it tries to sit down in the case so that unfortunately was a major fail on my part i should have just installed it right into the motherboard that was a lot of work that was actually quite a lot of work considering that was such a fail i'm just thinking about what what happened here so i think i am really bummed out that really really bums me out wow so i'm extracting this ram board from the machine i just um removed those connections there to the extra raz lines and now this should just pull out what a bummer look at that so there are sockets under there so i can install ram again and i guess it's possible to put this thing back in but wow if i had used lower profile pins perhaps this probably would have worked as well these are just really tall lower profile pins would have probably got this got this right in there i was really curious when i put this thing together if i did pull this out would it even be possible to get the thing back in look at that it goes right back in really easily so that's interesting that's kind of cool in a way because i i had it all connected together with all the pins in the sockets when i solder the top and the bottom on so what that means is that everything was in exactly the right place so it comes off and goes back on really easily but i can't use this the only thing i'm thinking is maybe i can relocate this like over here if i take this marpit 16 bit adapter from the shifter and then i solder the address lines directly onto the board and if i put the board like something like this then i would have to run the razz kaz lines there and 10 address lines to there and there's also some razz kaz lines that would come from the motherboard here that would go to that i don't know is it worth it is it actually worth it there were a lot of comments from viewers who said that the 512 k that actually was on this is the lowest common denominator for the st and that almost every piece of software except for productivity software completely works fine if you're talking about games that is so i think right now unfortunately this video is a bit of a bust i'm gonna not install that again i'm just going to put the original ram back in this thing and i'll put this computer back together just like it was when i got it 512k a little sad music montage here just reinstalling the original chips i took out of this machine back into it it's actually really easy to get them back in the sockets so that's a nice change and i'm just putting some heat shrink on those extra wires to the razz kaz line so when i put the computer back together they don't short on anything [Music] i dug into my screw collection of commodore screws and that's what i'm using to put this computer back together they seem to work for the most part and didn't seem to stress out the standoffs too much [Music] well i think i'm going to end the video here i know i intended to get to the disk drive the cartridge and testing out the st but that is going to have to wait until a future video this one was getting a little bit long it's really cool to know that this ram upgrade for the atari st that steven sent totally works and that toggle switch i installed is also a convenient way to switch between one meg and four mag so if you're installing one of these into your machine you might as well make that mod and of course if you're daring enough put a hole in the side of your st and you can actually put the toggle switch on the outside i'm not quite sure i was ready to do that on this st because the case after retro biting is in perfect shape i am truly disappointed that i ended up not being able to use this in this machine due to the mistake of installing those sockets maybe one point in the future i'll gain enough courage to remove those sockets and then i'll install this directly into the motherboard like it was designed to do just keep that in mind if you're doing it yourself do not use sockets i think with this video that's going to be the last video on this st for a little while so i really want to thank richard who was the original viewer from seattle who donated this machine to me along with the people that donated to him and he actually passed it on to me i do have a substantial amount of 8-bit atari stuff that i would like to get to a lot of it's going to need repairs and stuff so this won't be the end of the road for atari stuff but i just want to go back to the simpler things with eight bits i'd like to thank my patrons their names are scrolling up the side of the screen of course if you want to become a patron there's a link in the description and you can do so but i also want to thank you the viewer for watching my videos all the engagement and everything i get on the channel is what allows youtube to show it to more people and helps my channel spread and that means so much to me the channel has grown quite a lot in 2021. the year's almost over it's almost the end of the year and i don't know what 2022 is going to bring for me i think there's potentially going to be some changes in the future for me but i'm not going to talk about that at this point so anyhow yeah if you liked this video i would definitely appreciate a thumbs up but if you didn't you know what to do hit that subscribe button don't forget to check out my second channel you know all the usual youtube stuff and i guess that's gonna be that so stay healthy stay safe and i will see you next time bye [Music]

Channel: Adrian's Digital Basement

Views: 29,802

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Id: uqWCmKcaZtI

Length: 41min 55sec (2515 seconds)

Published: Sat Dec 18 2021