Restoring an In-Box Apple PowerBook from 1991!

hey everyone it's colin how's it going so here's something you don't see every [Music] day [Music] so this thing crossed my path recently and i just couldn't say no unfortunately it's not new one box but it's fairly complete inbox the only thing that i think is really missing is just the original packing materials while i'm going to go through and try to restore this machine get it fixed up as best i can within reason ultimately it's going to end up out at the free geek twin cities thrift store i don't really need to keep this for my own use i've got a similar model already so we're just going to keep that in mind as i go through and and try to get this machine working again also fair warning this video is going to be fairly long and pretty rambling so if you're in the mood for something short and concise and just gets to the point right away you probably want to skip this episode okay before we start looking at the computer itself there's some interesting accessories and stuff in the box that i kind of want to go through first so before we get into the contents of the box i actually want to take a look at some of the stuff on the outside because it tells an interesting tale this is like the original i guess config label for this machine it's the powerbook 170. again very standard model four megabytes of ram fdhd means it includes a floppy drive and a hard drive which all of these models did hd 80 80 megabytes sc stands for scuzzy and then what's also interesting is it came with not just system software 701 and around the time that this machine shipped system 7 was fairly new and it was a substantial upgrade over system 6 but also included the system 7 tune-up which was just kind of like a bunch of patches to kind of fix some bugs and that sort of thing also interesting to note is this was an assembled in ireland machine in the early 90s when this shipped apple had global manufacturing of course and a lot of the computers that apple manufactured and sold were actually made in the us but for a very long time apple had and still has operations in ireland where it's not just an office space but they did manufacturing there too and even to this day it's still possible to get a product from apple that was assembled in ireland i feel like it's becoming less and less common but it is kind of neat to see and then here's another couple of labels that help tell the story of this machine the first sticker that i noticed here is this price tag university bookstore get a load of this 3379 for this laptop and that's actually like the educational discount and rate because the powerbook 170 when it came out it was the top end of apple's powerbook line basically in the early 90s apple's first like true laptop computers there were three models the powerbook 100 the 140 and then the 170. this thing retailed or at least msrp when it launched was somewhere around forty five hundred dollars u.s so clearly there was not just some time that had passed and prices came down but also a pretty substantial educational discount it seems so yeah that's kind of it for labels on this box we might as well start going through what's inside it now unfortunately like i said it's missing its packing materials which i i'm kind of not surprised by i mean having the box in and of itself is kind of a surprise especially since it's a laptop because it's a laptop what's the first thing you're gonna do when you unpack it you're probably gonna throw it in like a laptop bag or a briefcase or something like that why would you ever need the box again but it does have some cool goodies in here so let's go through them so you might be wondering why this powerbook fax data modem is a separate manual and a separate driver floppy disk like why is it not included just as information in the rest of the booklets and the floppy holder and all that that's because this was actually an optional upgrade for the computer i mean this was the early 90s not everyone had access to the internet not everyone needed to do faxes so it was just something you could buy and add on to the computer either from the factory or as an optional add-in that like a computer dealer would install later something i noticed is that there's no reference to the facts data modem on the box that could have just been default with the config of the computer but it also could have been something added on afterwards and they just happen to keep the documentation and the floppy along with it either way you know communication and connectivity is just something we absolutely take for granted with computers these days and even 20 years ago having like an ethernet port and a modem built into a laptop was just a standard feature you wouldn't buy a computer without it but in like 1991 1992 yeah not everyone needed that a lot of people still use computers and laptops as just these standalone devices so the system disks i mean obviously if your hard drive failed or your os got corrupted or whatever you'd need a way to reinstall it so they'd give you a full set of floppies here and so the entirety of system seven came on there's four floppies down here some of these are kind of doubled up as you can see and then there's another two up top here for install one and install two and these all include various things like this one's disk tools and this is one that you could boot off of and we'll probably end up using this disk later to like reformat the hard drive and get the installation started of the operating system and then other components of the os that in some cases were optional and other cases were mandatory came on these additional disks so you had install one and install two for kind of the core components and then you could add things like fonts and then printing is going to be like some drivers and support for apple's printers tidbits is just miscellaneous stuff probably like software and extensions specific to laptops or specific computer models and you know it's just you'd go through the floppy disks and the computer would ask you to put the right one in the drive at the right time and it would load off of it i mean again that's something that we're totally haven't had to deal with in forever i mean you know installing windows so most people just do that off of a usb flash drive if you're doing a fresh install but even for the last 20 plus years i mean you just boot right off of the cd and load everything straight away installing software and especially the os way back in the 90s was a much more shall we say hands-on affair the thing that really kind of strikes me the most out of all the documentation included with the machine is these guides in these manuals i mean obviously a thin like getting started guide like this makes a lot of sense right like you know how do you plug the computer in how do you turn it on just the basic use kind of stuff right but what really gets me is these books so you've got it getting started with your macintosh and this is not necessarily going to be laptop specific this is about you know using the computer using the mac os i should say in general but there's two things about this that we just don't see anymore first is this is like a spiral bound book meaning it's intended for you to go back into it frequently it they did this sort of binding for a reason they could have gone with like a really cheap you know perfect binding where it's just glue down the middle but those books generally aren't too conducive to being used frequently so by going with the spiral bound they're intending for this to be kind of a reference guide that you can go back to at any point if you need it the other thing is the contents of this book like these pages it shows you how to use the mouse everybody these days knows how to use a mouse we're at a point where pretty much everybody knows how to use a computer at least to a basic extent there were plenty of people back in the early 90s who had never used a computer before and this particular machine could have been the very first computer they had ever used in their entire life and so learning how to do things like point and click and drag and double click i mean they're teaching you just stuff that we kind of laugh at these days because it's so i don't know in intrinsic to our knowledge now but back then no no you absolutely needed guides like this just to teach people how to use computers and then going even deeper in you've got this mac user's guide this book basically teaches you everything you need to know about the computer and how to use it like from the operating system perspective and even some of the basic applications like literally everything because you couldn't really get on the internet and google it back then right there were no knowledge based articles or youtube tutorials or anything like that unless you had someone that you knew that could hands-on teach you this kind of stuff or a very patient like computer dealer or whatever who would sit there with you you needed a book and so this was just included in the box with every computer and pc manufacturers did this too this wasn't just a mac thing when was the last time you ever got any sort of documentation anywhere near this like exhaustive about a piece of technology that you've bought it's been a very long time and you know what even though like we all know what's in this book it's still kind of fun to just page through it and see how they teach you to do stuff and the language that they use there's very simple language in here it's not very technical at all and there's a lot of like reassuring language that i've found in these books that try to keep people comfortable because computers back then i mean they were pretty daunting especially if it's a brand new thing to you that you've never used before right next up let's take a look at some of the accessories that came in the box with the computer this is a little holder and it's got they it's not used some double-sided tape on the back and this is for holding the external microphone it looks like with actually this is an extra one because i'm seeing one of those holders already in this package i haven't seen an unused one of these in forever but i've never seen this clip one before but i mean it kind of explains they came with a pretty decent length of cable on them so the clip you know maybe the intention was for you to be able to wear it like if you're doing i don't know voice memos or whatever i mean max we're definitely multimedia machines like by design but it wasn't until later in the 90s that people started doing like heavy-duty audio production kind of stuff and it wasn't until even later on that people started doing you know video like rudimentary video conferencing kind of things so generally if you were going to use a mic on a mac in the early 90s it was to do kind of quick little voice memo type of things but i mean clearly they wanted you to get the best audio quality you could so they included a like a wearable clip version for this mic alright one more accessory that was in the box and then we'll start looking at the computer itself i haven't seen one of these in a long time but i definitely remember using them this is called a local talk adapter local talk was a more basic serial based networking protocol that apple had from the late 80s and through the 90s it predates ethernet at least the appearance of ethernet on macs but it was also a much less expensive and simpler way to network mac computers together the big thing that this was used for in other than just sharing files between computers but was also sharing printers and so you could get one of these simple dongles it basically plugged into one of the serial ports on the back of the mac and then broke out into what looks like a pair of phone jacks the idea is a local talk network was going to be daisy chains so you'd have like an input and an output and it used regular phone cables in fact you only needed i believe two wires in order to make local talk work so i've heard over the years some really interesting stories about people using like the spare phone wiring in their house like if their house was wired with four conductor phone wiring but they only had one phone line so it took just two of the wires like red and green they could then repurpose the yellow and black wires in their phone cable for local talk like without having to pull new wiring throughout their house but the idea is you know you'd have one computer's cable coming into here and then you know this would be connected to a computer and then maybe the output would go into another one of these adapters plugged into a printer and that way both computers or multiple computers could share the same printer and you could share files between the computers what's interesting about this particular adapter and what makes it a little bit different than some of the ones i've seen is this on off switch on here and it took me a second to realize what this was for local talk networks that use the phone cables required termination on either end of the cable and that's that's a long kind of electrical engineering explanation that i'm just not going to get into this time but basically the first device in the chain and the last device in the chain whatever unused ports you had on these adapters you had to stick a little terminator in and it was basically a phone plug that had like a resistor wired between the two wires this one basically has a terminator built into it which is nice because otherwise you'd lose those little terminators and you'd need one of course at the time when you lost it and so everything was going haywire you can just turn that terminator on and off through this little switch these were actually fairly inexpensive back in the day at least far less expensive than getting into ethernet or token ring networking i'd like to say memory serves these were only like 25 to 30 bucks each and just plug straight into the mac you didn't need any special cards or adapters or anything other than just these dongles and some phone cables all right so first impressions after taking the computer itself out of the box is that it's really clean whoever had this machine before obviously took very good care of it there's just a little bit of dust but that's kind of to be expected considering its age and how long it's been sitting around i don't think that this machine traveled very much just because there is like no scrapes or scratches or bumps or wear or anything on it and even if it did travel a lot taking care of machines like this made a lot of sense i mean you saw the price tag on the box like would you really beat up a computer that you paid that much money for so people generally got proper carrying cases and bags and stuff to put their laptop computers in they also generally only had the laptop as their primary machine so instead of being like a second computer and if it breaks oh whoops at least they still have another computer to use yeah this would have been it so they had a vested interest in taking as good of care of it as they could i'm going to try and open the screen carefully this is the first time i've opened the machine just because there's the possibility of brittle plastics and yeah minimal yellowing of the keyboard for whatever reason on these powerbook 100 and i've also seen it on the 500 series just the different types of plastic that they used the keycaps tend to turn yellow a lot quicker than the rest of the case in this case they're very similar shades so this thing was in the very least i think kept in a good location one bummer that i am seeing over here though is again kind of the sign of brittle plastic there's a crack in the casing over here and i don't think that was due to wear i think that's just a function of time sad to say of course the thing that can absolutely make or break just how restorable this computer is is going to be the condition of the battery it's got the battery cover yeah it looks like the battery itself is still in here if this thing leaked badly enough it can end up on the motherboard and i've seen it ruin computers completely survey says no leakage at all that's not common usually these leak and what's even nicer is that the little plastic tab on the cover is still intact the latch that keeps it in place if these batteries leak but not too badly you can actually detach the outer cover from the battery which is something i've talked about before in other laptop videos i really liked it when manufacturers did that because inevitably a battery like this will go bad it will leak but being able to detach the cover means you can put it back on the computer without the battery in there and it still looks at least complete yeah and a quick peek inside the battery bay those contacts look clean there's there's never been a battery that's leaked in here that's a really good sign and then around back a pretty typical complement of ports for a mac of this vintage power button reset interrupt that's like to drop you into kind of a debug thing it was what programmers used when writing programs or fixing bugs in their programs pair of serial ports audio in and out adb for keyboard mouse accessories like that scuzzy port for an external like cd-rom drive or hard drive and then that optional fax data modem okay and for the million dollar question will it power on a boot i've got the ac adapter plugged in let's uh hit the button see what we get [Music] [Laughter] absolutely nothing at all well then yeah normally i'd at least expect to hear some kind of pop out of the speaker or some sign of life and oftentimes on these old macs even just plugging the power cord in is enough to get the machine to power on like if the battery backup is bad or anything like that but this thing's just dead right now i'll try a different power brick and we'll see what we get all right spare known good ac adapter what do we get this time [Music] yep still a whole lot of nothing sad to say best case scenario the dc in jack on the back of the machine just needs to get re-soldered since the internal battery is obviously just completely dead it feels okay when i plug the cable into it though so sad to say i really suspect i've got some recapping to do on this motherboard so i don't think it's caps and that's because while i totally forgot with these models and machines there really aren't any electrolytic caps on any of the boards not on the cpu ram daughter card the main motherboard even underneath the modem card which i unscrewed there's a few tantalum caps on the board but those don't fail nearly as often as electrolytic ones do so i think this thing not wanting to power on is due to something else i've got the machine just loosely put back together none of the screws are in it but i pulled the main battery out i can't say i've ever seen a bad main battery prevent the machine from booting or working correctly but you know it was the first time for everything so i'm gonna just power it on i've got the ac adapter connected we'll see if maybe it wants to work this time well hey that's different the hard drive itself does spin up however the heads don't move that's what that clicking sound is you should normally get normal hard drive clicking kinds of sounds but that repetitive tapping sound basically means that the drive heads well you know what the drive is kind of done let me get this machine apart and i'll show you exactly what the problem is and i was hoping i wouldn't run into any of these but well this standoff i'm trying to get this screw out when i turn the screw the standoff underneath it just spins so this plastic post i'm gonna have to glue that one back together as best i can so uh this is interesting the drive says it's a 40 meg unit i could've sworn the box said 80 megs very interesting i am not surprised however to see that this is a counter drive because these counter drives are probably the worst when it comes to this particular issue although my understanding is that some of the quantum drives that were from this same era the two and a half inch scuzzy drives well they exhibit the uh the same problem let's pop the cover on this drive since it's we kind of have nothing to lose at this point and i can show you exactly what's going on so normally when you work on hard drives whenever you take the top cover off you need to work on them in a very clean environment specifically like a clean room environment or a very carefully designed filtered air type of setup underneath a you know a laminar flow hood that sort of thing because the data density on the platters is so high that even a little speck of dust can be enough to destroy data that's already on the drive however the data density on drives like these this thing's only 40 megabytes that density is so low that you don't have as big of concerns now the other thing is i'm going to more or less say that this drive is kind of a write-off so i'm willing to open this as a way to show you what's going on some people have actually managed to repair these drives and they work again and i've actually done that myself however i wouldn't trust a drive that's been opened in just a regular environment and repaired like this to be kind of a permanent fix i would do it only really for data recovery purposes i know some of you are going to disagree with just opening a drive in open air that's fine best you know best course of action would be to try and find a proper data recovery facility that can do this however try to find a data recovery facility that can work on a hard drive that's 30 years old that'll have the technology to be able to even read data off of this that sort of thing that's going to be difficult and very expensive so i think it's worth the diy approach at least sometimes if you can now obviously you know in a non-climate controlled or air controlled environment you're going to want to try and minimize the sources of dust if you can um because otherwise yeah it gets you know it gets a little bit more risky and i'm already starting to see one problem and that is with this gasket around the outside but we'll take a closer look at that when i get this hook the cover off this all right so very carefully open this up and you can see the inside of the drive and this one's got two platters and so being a 40 megabyte drive the platters are double-sided there's only 10 megabytes per side of each platter so very low data density obviously you don't want to get this thing dusty inside it however i'm again i know some people may disagree with opening a drive like this just in open air and again this drive i'm going to consider kind of a goner so i'm willing to do it but push comes to shove i have seen repairs like this done successfully all right i've got the screws taken out of the upper magnet here and then the trick is trying to lift this thing away there are actually two problems that can happen with these drives the first one is actually very simple in that you've got this gasket around the cover that seals the drive closed that gasket is made of a rubbery kind of material and like a lot of 30 plus year old rubbery material it can kind of turn to goo and in some cases that stuff liquefies to the point where it physically contaminates the drive platters themselves there's really no recovering from that if that's the case you can't clean these platters off physically without damaging them further so if you get any of the sticky cover goo on the platters the drive is definitely toast that is not what happened in this case what you can notice down here is that the drive is in its what they call parked position where it's all the way towards the middle of the platters there's actually no data in this like inner ring kind of area and down here is a little arm coming off of the armature so that little bit of rubber inside there comes into contact with this metal bit on the end of the arm and serves as a bump stop so basically as the drive head is flying back and forth if the voice coil tries to make it go too far it'll just bump into this piece of rubber instead of letting the head keep going and crash into like the center of the platter or anything like that the problem of course is this is also kind of a rubbery material and over time it gets sticky the voice coil doesn't have a whole ton of torque to it it's good at moving the head really fast back and forth but it doesn't it's not strong it can't pull the head away from the stickiness of this rubber bumper very well it's through like that little cutout that the end of the armature hits that rubber bump stop so what i'm going to do is i'm going to put a piece of cap on tape covering over that little window and that should be enough to keep the arm from actually touching the rubber part and getting stuck we'll put the drive back together hopefully that'll get it working so what about these standoffs where the drive mounting bracket went in obviously the plastic completely broke off of both of these and normally you've got these little brass standoffs that sit within the plastic and that's you know these threaded inserts is where the screws for the bracket ties into there's not much left well what i'm going to do is a semi-temporary slash semi-permanent somewhere in the middle kind of repair where there's still some plastic left in this standoff right i've had experience replacing these with 3d printed brackets on the display assembly and what i've found is you can actually melt the threaded inserts into place now i don't have replacement brackets for these modeled up and i haven't seen any online that'll be something that i'll need to do eventually for this repair though i'm going to try just melting those threaded brass inserts into what's left of these standoffs and see how well that works if it doesn't work it's no big deal you can always remove that threaded insert and mill away this plastic stand off and then put like a 3d printed bracket in its place glue them in place but i'm curious if you know with what plastic i have left if that's not going to work and the trick for actually doing this is to use a soldering iron let's see if i can get this to work out properly here that actually seems to work really nicely try and get this other one going cool let's uh try to get that bracket back in place all right the drive has been repaired power cable plugged in let's go oh that pattern's interesting although that could just be because the pram battery might be dead oh ho yeah check it [Music] all right see i just did a real quick clean up of any personal files that were on this machine there actually weren't very many and i will still absolutely be wiping this drive that'll actually be the next task but i just wanted to show you now yeah it boots this machine it powers on and boots from its own hard drive so you absolutely can again in quotation marks repair these drives do i trust this drive absolutely not as just a retro item for tinkering playing old games whatever you know the reliability of the drive doesn't matter you're not going to use a computer like this for daily tasks and storing important information anymore so if the data is priceless absolutely try to seek out some sort of data recovery company that can work with like retro drives like that but i'm just not aware of very many i still can't explain the whole 80 megabytes on the box 40 megabytes in the computer discrepancy but hey let's um let's get a disk tools floppy and see if the floppy drive works and then we can wipe the drive so i don't want to test the floppy drive with one of those good like in box original apple floppies so i've got system seven disc tools on a floppy i made myself if the drive decides to eat the disc at least it's eating a generic one [Music] i didn't hear it try to seek that disc at all and it came back with the whole you know disc is damaged think the floppy drive is probably bad or needs some service let's eject this one and try another disc just to make sure so here's like disc one of the system seven install set that i made up let's just see if it can read this oh it can says my disc tools floppy bad it sees all the files maybe i'll get lucky and not have to repair the floppy drive let's try the disc tools disc again no okay so hmm but it worked with the other disc so i'm guessing this one might just be corrupted or something well you say spin the wheel of death and try the original disc tools disc if if it eats this disc i've got another complete set of these floppies that i'll throw in instead so don't don't worry yeah and it reads that one okay fair enough so my other disc tools disc is bad let's um let's restart up off of that one it's going to spit it out pop it back in yeah it's totally booting off the floppy okay cool so you may be noticing that this display looks kind of yellow i think that's a combination of two things one the back lights these are compact fluorescent the ccfl cold cathode fluorescent backlight tubes and they just kind of go that way over time the other thing is i don't actually ever remember these displays being like perfectly white backlights even when they were new anyway so it's not horrible and actually the contrast on this display is really nice and i should also note that this display thankfully doesn't suffer from a very common problem that affects these machines it's called like tunnel vision is kind of what the community has named it i've talked about it more in another power book video if you want to go check that one out but basically the seal between the two panes of glass in the lcd panel fails over time and you get this weird like effect with the corners start to darken as the display gets used until you get like nothing viewable so that's why they call it tunnel vision this one doesn't seem to be experiencing that at all which is really nice this is the higher end active matrix display that was really the primary difference between the powerbook 170 and the 140 which was kind of the mid-range model the 140 had a passive matrix display which was not as nice to look at because the refresh rate was really really low however those are immune to that tunnel vision problem it only suffers on the the active matrix display so machines like the powerbook 170 and the 180 especially is susceptible to it this one looks really good and it's nice and bright so this is a very good lcd panel all right so the drive was successfully wiped i'm going to go ahead and power the machine off and then get the screws put back into the bottom of it and then we'll get a fresh os installed on here uh something told me i wasn't quite done with this machine yet see this gap in the rear display housing and the hinge yeah that means that at least one of the plastic standoffs that holds the display housing together the front and back halves that's broken off and it's kind of keeping this from being pulled together as tight as it should i experience that same problem on another very similar machine i go into detail about how i fixed it in that video but i'll um i'll get this display taken apart and we'll 3d print some brackets and glue them in and get it all fixed up for good so getting this display fixed was a little bit of an ordeal in that it was difficult to try to get the screw out of the front bezel on the right side what i ended up having to do was carefully pop the front bezel loose as best i could and then reach in with a pair of pliers to hold the brass insert inside in place so that i could unscrew the screw from the front that allowed me to free the front bezel and then i could get the screen itself lcd panel unscrewed laid down on the keyboard and palm rest assembly and then take out the last two screws that hold the rear display housing on that's what the hinges mount to and as i suspected yep it was the two plastic standoffs on the right side that mount to the hinge that had crumbled over time so i got them cut down the rest of the way with a pair of flush cutters and then sanded that area smooth i 3d printed a replacement bracket and then used some super glue with some accelerator to mount it to that rear display housing this is special glue that i've used before that's specifically designed for work on plastics and it's done a generally really good job i was able to reuse that soldering iron trick to then melt the threaded inserts back into that replacement bracket and then the rest of the display just went back together as it should and it looks great now the hinges feel nice and tight the display is nice and stable it doesn't wobble back and forth or anything like that and as long as whoever ends up with this machine is gentle with it that repair should last a very long time while i had the machine apart i also fixed this crack in the plastic i think this actually formed due to the broken hinge standoffs in the screen a lot of the stress of opening and closing the display is kind of in this corner since the hinges mount to the top panel so i guess i'm not really surprised that with that hinge on the display broken it would cause this area to flex quite a bit more than it otherwise would and you know the plastics are getting brittle so that's just where it decided to crack i used a little bit more of the super glue with the accelerator to kind of piece this back together thankfully it was a fairly clean break i did get a bit of glue squeeze out unfortunately i tried to clean it up as best i can so this doesn't look 100 cosmetically perfect but it is holding together very strongly and it's a far sight better than just having this big crack in the plastic that's kind of you know flapping there loose so i'm glad i was able to get this sorted out as well so the last thing left to do is deal with this battery the machine didn't want to power on at all with this battery installed so the easy solution is just some capped on tape over the contact so i'll put a couple of layers on there that way it just won't make electrical contact between the battery and the computer the battery does add a little bit of ballast to the front of the machine so that it doesn't want to tip back you know quite so easily so since this one isn't leaking i'm inclined to just leave it in there if it was leaking i would just take that cover off and slide it in i think there are some 3d models of these batteries available either if you want to rebuild one yourself or if you just want to produce a dummy battery to slide in there because it does add a little bit of structural rigidity to this front corner anyway for the plastics but yeah i think just taping over the contacts to make sure that it doesn't piss off the rest of the computer is gonna be good to go for this one so yeah i'm happy with how this one turned out overall it's not a hundred percent perfect i did the best i could with those plastics repairs for example but you know what overall this thing is in really good shape now and it's completely functional so i'm gonna count that as a win it'll end up going off to the free geek twin cities thrift store so it'll end up in the hands of another retro collector or someone who maybe has never played around with an older mac before i'm not really sure if you're interested in learning more about free geek twin cities i'll include a link down in the description to a video i did about him a while back it tells a pretty good story anyway i'm also curious do you like this particular video format it's hard for me to find out whether people prefer these longer potentially rambling videos that allow me to go into more detail about topics versus just kind of sticking to the facts and getting through a higher polish kind of more edited video where it takes less time but maybe i can't get quite as deep into detail let me know down in the comments what you think if you want to see this style of video more or less frequently or just what your thoughts are on that one so anyway if you like this one i would appreciate a thumbs up be sure to subscribe you can follow me on social media at this does not comp and as always thanks for watching you

Channel: This Does Not Compute

Views: 140,077

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Id: _Vg4Ludcshs

Length: 42min 4sec (2524 seconds)

Published: Fri Jul 23 2021