This Mac nearly had me beat! It fought hard but I got it in the end.

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In this video I repair a Mac 512k motherboard with an unknown RAM expansion card on it. In part 1, we looked at two Mac motherboards with unusual RAM expansion cards. The Mac 128k motherboard worked, but I left the Mac 512k motherboard for another video. This is that video! Figuring out what was causing this motherboard to not boot and display video issues required me to study schematics and try to understand the architecture of these early Mac machines, and it paid off!
Part 1: • Mac motherboards with ...
Part 2: This part!
-- Video Links
ROM Matrix:
docs.google.com/spreadsheets/...
Sad Mac Error codes:
tinkerdifferent.com/resources...
Macintosh 128k technical documentation:
bitsavers.informatik.uni-stutt...
ROM Disassembly:
www.bigmessowires.com/rom-ada...
PicoRC:
github.com/dekuNukem/PicoRC/b...
www.tindie.com/products/dekun...
Adrian's Digital Basement Merch store:
my-store-c82bd2-2.creator-spr...
Support the channel on Patreon:
/ adriansdigitalbasement
Adrian's Digital Basement (Main Channel)
/ @adriansdigitalbasement
My GitHub repository:
github.com/misterblack1?tab=r...
-- Tools
Deoxit D5:
amzn.to/2VvOKy1
store.caig.com/s.nl/it.A/id.16...
O-Ring Pick Set: (I use these to lift chips off boards)
amzn.to/3a9x54J
Elenco Electronics LP-560 Logic Probe:
amzn.to/2VrT5lW
Hakko FR301 Desoldering Iron:
amzn.to/2ye6xC0
Rigol DS1054Z Four Channel Oscilloscope:
www.rigolna.com/products/digi...
Head Worn Magnifying Goggles / Dual Lens Flip-In Head Magnifier:
amzn.to/3adRbuy
TL866II Plus Chip Tester and EPROM programmer: (The MiniPro)
amzn.to/2wG4tlP
www.aliexpress.com/item/33000...
TS100 Soldering Iron:
amzn.to/2K36dJ5
www.ebay.com/itm/TS100-65W-MI...
EEVBlog 121GW Multimeter:
www.eevblog.com/product/121gw/
DSLogic Basic Logic Analyzer:
amzn.to/2RDSDQw
www.ebay.com/itm/USB-Logic-DS...
Magnetic Screw Holder:
amzn.to/3b8LOhG
www.harborfreight.com/4-inch-...
Universal ZIP sockets: (clones, used on my ZIF-64 test machine)
www.ebay.com/itm/14-16-18-20-...
RetroTink 2X Upconverter: (to hook up something like a C64 to HDMI)
www.retrotink.com/
Plato (Clone) Side Cutters: (order five)
www.ebay.com/itm/1-2-5-10PCS-...
Heat Sinks:
www.aliexpress.com/item/32537...
Little squeezy bottles: (available elsewhere too)
amzn.to/3b8LOOI
--- Instructional videos
My video on damage-free chip removal:
• How to remove chips wi...
--- Music
Intro music and other tracks by:
Nathan Divino
@itsnathandivino

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Опубликовано:

30 апр 2024

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Комментарии : 216

@silmarian Месяц назад

I honestly like the lighting in the Adrian After Dark videos. It feels more like chatting over a drink and sets the visuals apart from every other retro tech channel out there.

@johnsonlam Месяц назад

Screen looks more comfortable if not for circuit reading or detail.

@HeyImGaminOverHere Месяц назад

Agreed! I really enjoyed the after dark ambiance. I definitely hope there are more of these to come!

@malanvogt Месяц назад

This guy never ceases to blow my mind with his diagnostic skills

@Dukefazon 2 месяца назад

Holy sh*t, all that explanation and schematics reading lead to "I'll just hold the mouse button..." and the system boots :D

@Cherijo78 Месяц назад

If this were the 1980s it'd be an RTFM moment, but... Nearly 40 years later and the manual is lost to time...

@nurmr Месяц назад

I keep thinking Adrian needs a Flying Toaster plushy for the after dark sessions. It could be friends with Rammy.

@xanderplayz3446 Месяц назад

@@logipilotJust a quick tip: It’s you’re, not you’r.

@jasentenney6907 Месяц назад

I like the after dark format. Do more please. Thanks!

@Jody_VE5SAR 2 месяца назад

That was a tour de force in troubleshooting an unknown function. Well done!

@jammi__ Месяц назад

For calcium stains (that's what hard water stains are), a mild acid works fine, just as with kitchenware. Citric acid is commonplace and sold as powder, so you can mix that up to the concentrate level you want.

@kevincozens6837 Месяц назад

Always satisfying to find the problem and get a board working again. I was surprised the motherboard wasn't tested without the RAM expansion board as one of the first diagnostic steps.

@joe08867 Месяц назад

I like the Adrian after dark. It has a cool feel with the mood lighting. Like hanging out with your buddy in a bar or tavern.

@keithkneeland6849 Месяц назад

I was just thinking the same thing. Just a couple buddies shooting the shit about computers that they’re fixing. I dig it!

@TheDoctorhuw Месяц назад

fantastic fault finding, well done on you persistance too. And I enjoy fault finding too, even after over a 40 year career in electronic engineering!

@kirusyaga Месяц назад

1:00:10 you've could just count pixels between your line and line that motherboard RAM generates, and removed the chip that lives needed count of bits away.

@PaulDriverPlus Месяц назад

Great Episode. I never ran across that card while supporting the 68000 Macs but I do remember that RAM errors were always annoying as heck on those, which is why any RAM error got you a spares replacement board and your board went to Apple for repair ( it was faster thus cheaper ). I also remenber how I became the only shop tech who could work on Macintoshes. Now to preface this, my father was and E.E. and actually has a very cool patent from the 60s that is a way to get 8 phone calls over a single radio channel, kind of a tdma sort of thing, and my Dad usually ran a TV repair shop, and so, I kinda grew up those. So I'm trying to do a live power supply/display adjustment on a mac 68000 which means I've a mirror on the bench, and I'm reaching into the Mac to set the gain or whatever it was that made them bloom, and I keep getting tickled now and again by the high voltage, and I softly say "damn" each time, somehow that makes it not hurt. The shop manager, call him Ed, goes "What's wrong" and I tell him "I'm adjusting the gain and I keep getting zapped, and I twitch and miss the setting when I get zapped". Ed gives me this look, like I'm some kind of imbecile that must be pittied, and says " I'll do that " and takes over. Oh Right, the customer was there waiting to pick the Mac up, and the screen was over bright and not too readable, that's what the isuse was, lolz , memories, like holograms, the more you excerise the memory, the more of it pops back. So I go up to tell the customer "Just a few more minutes, the service manager is taking care of the adjustment" and walk back to the shop, when Ed screams "Fuck" and I see the Mac come flying across the shop, hitting something and the CRT goes "POP" Ed claimed he got shocked, spasmed and the Mac took flight. But because I'd worked on CRT TVs so much, I didn't (still don't) have the same reaction to getting shocked as most people, stun guns can make me laugh, and I can walk while being tased, not easily, but yeah, that's how the verry irritated Computerland GM declared that unless anyone else had high voltage experience I should be the only one working on CRTs. Oh yeah, the Custome ended up with a whole new Mac too. Lolz, I later built a jig with extended cables to let you safely do those adjustments.

@siberx4 Месяц назад

Brilliant deduction about the mouse button, very impressive! When you first talked about the vertical lines, I was hoping you'd use their exact positioning to help you narrow down the failing RAM chip and sure enough, that's what ended up happening. It's so interesting seeing how close to the metal these older systems are where you can have a 1:1 correspondence between a hardware failure and the actual symptoms, rather than just the random crashing you get nowadays due to all the layers of abstraction between the user interfaces and the hardware itself.

@user-zm4oy6mf5z Месяц назад

I sometimes wonder if the board designers watch this program and sit there laughing as you struggle to understand their work?

@llwellyncuhfwarthen Месяц назад

I had left Steve Wozniak a message a fair while ago to have them pop in once in a while to watch.

@Toonrick12 Месяц назад

@@llwellyncuhfwarthenI don't think Woz worked on the Macintosh.

@colinstu 11 дней назад

@@Toonrick12 Adrian has done Apple II diag/repair work. Woz would recognize some of that..

@InssiAjaton Месяц назад

The “water stain” is quite likely calcium carbonate. As somebody else already noted, vinegar would dissolve it, IF you can tolerate the smell. If not, maybe you could find oxalic acid that will do the same with radically less odor. After the acid treatment (just a couple minutes), you should put the board through a dish washer cycle, and after that, flush twice generously with distilled water, followed by blow drying. Mildly warm, if you can produce such. A good long time!

@user-hb8sq6ce9u Месяц назад

Citric acid can be used as well.

@Agnarian Месяц назад

When i was a programmer, i got my best work done between the hours of 1am and 3am. Quiet, no interruptions from the world, it was perfect for coding.

@brooknet Месяц назад

What an amazing 'whodunnit' bit of RAM detective work! I loved watching you finding the culprit.

@GarthBeagle 2 месяца назад

Dang, great work! I love how you found the (well lack of) RAM test stuff in the ROM and the mouse down workaround for the add-in card

@FabioJulioRoque Месяц назад

Amazing skills Adrian! The second channel really deserves more contend like this one. Congratulations!

@jgvillan01 Месяц назад

I like After Dark, and I love the old screensaver too.

@anthonyblacker8471 Месяц назад

Isn't is such a great feeling of accomplishment when you find the code that figures out the bad chip? So good!

@djdoo Месяц назад

Just excellent logic and work! One of your best videos of all time! I don't care about MACs at all we never had them here in Greece, but I loved the way you approached the situation and even without a scope's help which is a tool most of us don't have, you figured out the fault! Cheers, keep up the great work, Jim.

@tonygroenewoud-powell53 Месяц назад

Your level of research, attention to detail and layperson explanation is AWESOME!

@rager1969 Месяц назад

Great job Adrian! It seems like a weird design choice that holding down the mouse button doesn't make it use the mobo RAM, but rather the first bank on the card.

@FloPius Месяц назад

Wow, that was crazy! Great Job! Thank you for sharing with us and the explanation! ❤

@cla3d Месяц назад

Simply amazing. Love this kind of content. Thanks!

@Locut0s Месяц назад

I love watching you problem solve your way through all of these repairs! It's so satisfying!

@TheBeardedDog Месяц назад

I really enjoyed the troubleshooting in this video. The repair videos are definitely my favorite.

@johnwestby7913 Месяц назад

Watching this from Gresham... Love the repair videos and the logical deduction and creative solutions to find them. Keep up the repair videos and enthusiasm. It's very infectious.

@Tevruden Месяц назад

Vinegar would also work to remove those hard water stands and neutralize any remaining battery juice.

@peregrine1970 Месяц назад

This was an awesome episode. Loved watching the thought process lead to that solution. My hat is off to you... as long as the east wind isn't blowing in from the gorge.

@joopidema Месяц назад

As always, Adrian, excellent video. And again, we learned so much. Thank You!

@johnsnook2358 Месяц назад

I really enjoyed this video. I also like the Adrian After Dark video format.

@insanelydigitalvids Месяц назад

Thanks, Adrian. The After Dark segment has one of the BEST explanations I've ever seen about the dance between hardware and software in these early Macs (and even a bonus dive into 68K ASM!) Excellent, informative and riveting video. A Master Class in information-led diagnostics. ❤

@michaelturner2806 Месяц назад

I would've thought removing the ram expansion and restoring the motherboard to stock would've been one of the first troubleshooting steps. After documenting how the expansion was set up, of course.

@dawnmitchell8213 Месяц назад

This was one of my top favourite videos of yours. Maybe the top video due to your tenacity to troubleshoot it until you got it working. Over the years I have lost sleep not being able to solve a problem. I once took 2 months back in 2006 with technicians in both the US and Canada helping to try and solve a problem that seemed to have no solution. Then one night at 3am a thought popped into my head so I hoped in my truck and drove to my customers sight to try my fix and bingo it worked. It’s very satisfying fixing a problem like that.

@Ariffer Месяц назад

Amazing work… great detective work. I’m so glad that someone like you is rescuing these vintage machines!

@geoffcollins6601 Месяц назад

Awesome totally cool and well done, love your thought process with this problem.

@levilinwood1371 Месяц назад

Love your videos, Adrian! Great detective work discovering that mouse-button disable feature for the RAM card. I got very similar jailbar video artefacts while trying to restore my old family IIsi - in 1-bit video mode I noticed the pattern of black bars repeated every 32 pixels (the data bus width of that machine). Looking at the jailbar pattern on your Sad Mac (a 32x32 icon centered on a 512 pixel wide frame buffer), if you count down from 15 starting from on the left side of the icon, you'll find the bar coincides with bit 10 where the first black bar on the left appears. This technique helped me home in on a capacitor-eaten data trace between RAM and the video IC on my machine.

@bikeforever2016 Месяц назад

Love the deep dive fault finding and the video format. Feel free to keep them going.

@TheBelcherMan 26 дней назад

Good job mate! Had fun watching.

@CayMacVintage Месяц назад

Amazing work and I learned a lot from this video. Thank you for your detailed research and explanations.

@PeteWord Месяц назад

Great series!

@TheZcoffin Месяц назад

I fixed some single pixel vertical bars like that on one of my SE/30. Just needed to repair a couple broken traces. Thanks for the explanation Adrian! I love following along with your repairs.

@stompreaper Месяц назад

This was satisfying to watch! Glory!

@aco2468 Месяц назад

Super funny and great video! I very much enjoy all the troubleshooting, congrats!!! well done!

@evaDrepuS Месяц назад

Yet another excellent video from one of my favorite RU-vid creators (right up there with David at Usagi Electric and Ben Eater). Some of the mail call and similar videos may not get a full watch, but the deep dive ones like this are always worth the watch. Great start to a week vacation, and I even heard Adrian use my comment from his last after dark video in this one. :)

@pcawte Месяц назад

Truly excellent piece of diagnosis

@andik6828 Месяц назад

Great job figuring it out Adrian thanks for video

@Merescat Месяц назад

simply amazing! great work!

@josuaschmid501 Месяц назад

I really enjoy watching your content in general, this one however was just one of the cherry on the top ones!

@TyphinHoofbun Месяц назад

This was a great video, it was amazing watching you go through everything! I have almost no experience with Macs, and I certainly didn't work on them. My elementary school had Apple computers, and got a suite of Macs donated to them shortly before I left. It's always neat seeing the insides of all these computers I was aware of, but never got to truly experience. ^_^

@piwex69 Месяц назад

One of the best episodes to date! I always admire IPL or boot sequences for different platforms. I wish someone explained the power-on procedure for later macbooks, like the pro from fall 2009.

@allunread1358 Месяц назад

What an inspiring video, great logic and persistence.

@Luke-rr9po Месяц назад

Awesome video Adrian, love the after dark stuff - amazing! 😊👍

@JL-hy7ve Месяц назад

Adrian you amaze me and your detective work is great. I like the after dark sessions. I look forward to your videos on Wednesday’s and Saturday

@user-nd8zh3ir7v Месяц назад

that was a fun adventure! enjoyed it quite a bit.

@kapitannemo7454 Месяц назад

Hi, another great work! Recently i learned some ram debugging trick: wire method. One end of wire connected to gnd or 5v, and with other end you can pull down or up data lines of ram chips (for short time, not to damage chip) and look for vertical line

@eDoc2020 Месяц назад

Yup, I was going to say this. To be safe you probably want to use something like a 10 ohm resistor instead of a wire, then if you short the power rails you shouldn't fry anything.

@baards Месяц назад

Great video, Adrian! I like the after dark theme. What really caught my eye was the video ports on the SE in the beginning. I have a SE with similar ports, it has a video card made by Orchid Technology. I have never gotten the card to work. Either I’m missing a driver or the card is bad.

@ast3663 27 дней назад

awesome analysis

@nysaea Месяц назад

There is a remarkable lack of flying toasters, but the black magic (pun intended) makes up for it!

@andychamplin Месяц назад

I have to say that going to Adrian's class is quite entertaining. I learned a lot.

@LittleDancerByGrace 28 дней назад

I really love the 'after dark' vibe. I also enjoyed watching the chess game at the end.

@gregmark1688 Месяц назад

Ok, figuring that out about the mouse button really makes you look like a friggen genius, Adrian.

@Capt.Marco-Hawk-L.L.A.P Месяц назад

instant thumbs up for amazing work

@retroheadstuff8554 Месяц назад

Great videos, part 1 and 2 👍

@Cherijo78 Месяц назад

This Episode of After Dark is so spicy it needs an Only Adrian account. 🤪 Seriously though, I really enjoyed the way you backed off and walked us through the thought process to understanding how this particular RAM card design played with the motherboard and the errors you saw. Well done!

@waxore1142 Месяц назад

The only thing I find questionable myself is the crystal with using CLR. If that can is not completely sealed at the base and any liquid gets in there it's done. Maybe desolder it. Idk if i would even bother though. A lot of work for it to just look nice.

@andrejgerbec8645 Месяц назад

Nice hunt! Good job!

@strunapl6103 Месяц назад

Just notice yours t-shirt ... May the 4th be with You. 😎 .... the force is strong with this One.

@jessiec4128 Месяц назад

I had a few SE models myself. Never had a battery explode. I reallyi enjoyed this video. I no long have any MAC systems :(

@KelikakuCoutin Месяц назад

Keep the faith. You do what they all said couldn't be done. Board level repair. Those fatalists. We can't let them win. Thanks for the content. Keep up the good work. בס'ד

@TheGreatAtario Месяц назад

The twists and turns!

@stompreaper Месяц назад

I’m really enjoying the after dark series. Definitely want more!

@georgestephens2593 Месяц назад

Rammy approves of your ram troubleshooting skills Adrian.

@Choralone422 Месяц назад

After watching this video I seem to remember doing the mouse button trick back in HS in the 90s on a Mac Classic that was acting up in class. Doing that made the machine slow but eliminated the crashes. A teenage me (who was only into PCs at the time) didn't bother to wonder why it worked, just that it did.

@johnlittle8975 Месяц назад

This whole troubleshoot reminds me of the "which cup has the Iocain poison" logic loop from the Princess Bride. "Parallel Pirates from Alameda don't like corrosion and will keep it as far as possible from them, therefore, I clearly cannot trust the RAM chip in front of me..."

@baronvonschnellenstein2811 Месяц назад

Very good episode, Adrian. Hope you weren't _too_ wired at stupid-o'clock in the morning when you'd completed the repair and were able to get a good sleep after that :) Certainly an intriguing fault given the unknown RAM boards and patina of limescale on the motherboard.

@lukehindman4498 Месяц назад

That was quite the journey 😊

@jaysearle538 Месяц назад

Love the after dark content!

@Screwtapello Месяц назад

Growing up with serial and USB mice, I always thought of them as something complex for later in the boot process when you'd gotten things running. It never occurred to me that the mouse button on its own might wind up as a TTL signal on the motherboard, but in retrospect given it was a huge part of the Mac, it's a pretty sensible way to do it.

@rommix0 Месяц назад

59:13 That beep was obviously a different pitch. Probably a good indicator of something corrupt as the beep routine is assembly code that runs.

@Blackkspot Месяц назад

This episode really catched and holded my attention from start to end.and i rarely watch 2nd chan videos. 👌

@OpCode90 Месяц назад

Do you have a program that can now test all of the other ram on the expansion board, other than that first bank that we know works? PS: I loved the entire deep dive and technical knowledge you have now bestowed on the world. I was following right along with you, talking to the screen about the different data lines and then you would mentioned them. So cool to see someone tear into these old PCs with your experience level. Thank you!

@frugalprepper Месяц назад

I sent you a e-mail on a source for the DB-19 Right Angle Female that is new. Great Video!

@dawnmitchell8213 Месяц назад

That’s pretty impressive sleuthing to track down that mouse button trick.

@nagyandras8857 Месяц назад

Hell yess I love repair videos. No mather what you repair. Even if it ain't a computer at all.

@jayfowler4747 Месяц назад

Think it's time to create a test kit for mac's... that was a good job figuring out what was going on....

@davidemmons8001 Месяц назад

This was the fastest moving video you have made. Adrian, how much caffeine to stay up to do this? Fun all the same. Great deductions.

@jackdrizzleshizzle4389 2 месяца назад

Thanks for another great video. It really blows my mind how you managed to solved this. I'm really impressed by that!

@adriansdigitalbasement2 Месяц назад

Thanks!

@pribeiro Месяц назад

Long but fun. Nice

@lindoran 2 месяца назад

You fixed it! What a ride 😁

@jamie5686 Месяц назад

Great interesting video well done you did a great job, these skills are being lost so i appreciate the efforts.

@m4rgin4l Месяц назад

Amazing content.

@criggie Месяц назад

Next time, Adrian takes apart that SE case and we see what's INSIDE !

@markmuir7338 Месяц назад

“Zero to Sad Mac” sounds like progress to me 😅

@horusfalcon Месяц назад

You might want to get that board into an ultrasonic cleaner. As for the rest of the repair, very systematic approach fouled by an initial assumption that was flawed. It happens that way sometimes, but you got distance when you needed it and figured it out, which shows both persistence and patience. Well done!

@waxore1142 Месяц назад

The clear plastic window on the side of the headphone jack comes off if you wanted to clean the contacts