Uploaded December 2025 | Updated September 2026, 1 week ago
I have a Lunchbox PC enclosure with a German keyboard, and I am still going to build it into a complete computer. But I also occasionally search eBay (the place where I buy the things I later regret™) for lunchbox PC related items. Because you never know when someone might list parts for your existing lunchbox PC enclosure...
Or, of course, list an entire working lunchbox PC. One seller offer later, after the seller corrected the crazy $140 shipping cost to a more believable $75 shipping cost, and I Bought It Now. I didn't really need it, but #DOScember was coming up.
Well, it's now #DOScember, so it's time to tear down, clean, inspect, and reassemble this lunchbox PC. Because you never know when you will need a 286 that's about the size of a large lunchbox. Maybe an extra large lunchbox. Maybe the name refers to it being carried like a lunchbox and/or is generally lunchbox shaped.
Last time we disassembled the computer, cleaned some very minor corrosion, and tried to get the original Maxtor 7120AT hard drive working. Unfortunately, while the original hard drive (or is it?) sounds OK, I can't successfully partition it. The read or write head is not working properly... possibly both. I guess XT-IDE will have to come to the rescue!
Will we get XT-IDE running on a network card? Will we get DOS installed? Will I find a way to get a sound card into the case (so that it can someday go "Meep! Meep!")? You'll have to watch to find out!
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... or simply do the YouTube things: Like/Dislike, Comment, Subscribe, Enable Notifications, and participate in the Chat. These things help the channel, too!
**
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I have a Lunchbox PC enclosure with a German keyboard, and I am still going to build it into a complete computer. But I also occasionally search eBay (the place where I buy the things I later regret™) for lunchbox PC related items. Because you never know when someone might list parts for your existing lunchbox PC enclosure...
Or, of course, list an entire working lunchbox PC. One seller offer later, after the seller corrected the crazy $140 shipping cost to a more believable $75 shipping cost, and I Bought It Now. I didn't really need it, but #DOScember was coming up.
Well, it's now #DOScember, so it's time to tear down, clean, inspect, and reassemble this lunchbox PC. Because you never know when you will need a 286 that's about the size of a large lunchbox. Maybe an extra large lunchbox. Maybe the name refers to it being carried like a lunchbox and/or is generally lunchbox shaped.
Last time we disassembled the computer, cleaned some very minor corrosion, and tried to get the original Maxtor 7120AT hard drive working. Unfortunately, while the original hard drive (or is it?) sounds OK, I can't successfully partition it. The read or write head is not working properly... possibly both. I guess XT-IDE will have to come to the rescue!
Will we get XT-IDE running on a network card? Will we get DOS installed? Will I find a way to get a sound card into the case (so that it can someday go "Meep! Meep!")? You'll have to watch to find out!
*
Use discount code JUSTINTIME for for 5% off all Computerized Start™ merchandise at https://shop.jdmcs.com.
*
Ways to Support the Channel:
☕️ Tips or Support via Ko-fi: ko-fi.com/jdmcs
🈷️ Support me on Patreon: patreon.com/jdmcs
📦 Amazon Wishlist: jdmcs.net/wishlist
... or simply do the YouTube things: Like/Dislike, Comment, Subscribe, Enable Notifications, and participate in the Chat. These things help the channel, too!
**
Read Computerized Start™, my Official Blog: jdmcs.net/myblog
Follow me on Instagram: jdmcs.net/myinstagram
Follow me on Twitter: jdmcs.net/mytwitter





![Saving COMPUTER (My Apple ][ Plus Clone from MCA), One Socket at a Time (Computerized Start™ Live)
Ive launched a merch shop: https://shop.jdmcs.com - use code JUSTINTIME for 5% off all Computerized Start™ merchandise through at least July 31!
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Last time I had COMPUTER on the bench, I started the process of removing sockets. I didnt get very far, and even caused some trace damage. But what I didnt realize at the time was that the handle for my desoldering station was failing. And @JoesComputerMuseum has since given me another suggestion for removing sockets with problematic solder, which I successfully used on the Apple ][ Plus Clone motherboard I bought on eBay (the place where I buy the things I later regret™).
Except that Apple ][ Plus Clone motherboard wasnt a regret, yet COMPUTER was almost @Mac84s regret... but I digress.
I now have a new handle for my desoldering station, and it made quick work of the solder on my VIC-20. Maybe it will also make quick work of the solder on COMPUTER. Because it looks like Im going to have to save computer one corroded IC socket at a time (repeat 88 times - Great Scott!).
Will I be able to remove more than one socket an hour? Will I cause more trace damage? Will Clarus the Desoldering Station hold out? Youll have to watch to find out!
*
Ways to Support the Channel:
☕️ Tips or Support via Ko-fi: https://ko-fi.com/jdmcs
🈷️ Support me on Patreon: https://www.patreon.com/jdmcs
📦 Amazon Wishlist: https://jdmcs.net/wishlist
... or simply do the YouTube things: Like/Dislike, Comment, Subscribe, Enable Notifications, and participate in the Chat. These things help the channel, too!
**
Read Computerized Start™, my Official Blog: https://jdmcs.net/myblog
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![The Macintosh IIsigh: More Diagnostics, More Soldering, More Speed? (Computerized Start™ Live)
The Macintosh IIsi was launched as a lower-cost alternative in the Macintosh II series. To keep costs down, Apple used more electrolytic capacitors, and the surface-mount electrolytic capacitors from the early 90s are past their expected lifetime. In addition, despite the power supply being made by Sony, the capacitors in it are also known to leak (though I cant help think cost tweaking by Apple led Sony to use lower grade capacitors).
Last time we looked at the IIsi that would chime and then death chime, I found two broken traces and ran some bodge wires... only to have more data bit errors, not fewer. IIsigh. Before I start major drastic chip replacements on a now fragile PCB, lets take one last look at what Diagnostic Mode is telling us. Because I might have made a mistake running those bodge wires.
And if we get the IIsigh booting, we will finally full-send that promised 25MHz upgrade attempt.
Will Diagnostic Mode lead us to the error? Will the chat come in clutch (of course)? Will we see why the IIsi was so crummy after installing the 50MHz oscillator? Youll have to watch to find out!
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Table of Contents
0:00:00 Pre-Roll
0:02:39 Greetings and Announcements
0:11:15 Wheel of Regrets™ (Who comes up with these titles anyway?)
0:11:38 Wheel of Regrets™: Western Digital WD1003V-SR1 Winchester (MFM) Disk Controller
0:16:25 Picking Up Where We Stopped Last Time with IIsi Number 4
0:45:36 Bodge Wires, Two Little Bodge Wires, Two Blue Bodge Wires, Where Are You [Going]?
0:48:27 Troubleshooting a Ko-Fi Notification Issue
0:52:09 I Finally Inspect the Board with a Multimeter
0:59:30 Oops, My Bad... IIsigh
1:03:00 Removing the Bodge Wires and Retesting
1:07:00 Troubleshooting a Discord Issue (by ending the task)
1:09:00 Continued Retesting and Chatting About Streaming
1:17:06 Talking About the Work Bench
1:29:10 Double-Checking Traces and Correcting the Bodge
1:38:37 Smoke Testing (Weve Got Progress Here Folks)
1:47:15 Five Little Megabytes of RAM, Ah, Ah, Ah! (Thunderclap)
1:52:28 BlueSCSIs Dont Work on the IIsi Unless You Got Power
1:58:00 Snooper 2.0 for a Few Cycles More...
2:11:44 Speedometer Baseline Benchmark
2:20:00 Baseline Benchmark Re-Do (without OBS Overlays)
2:29:30 Removing the Serial Cable and Replacing the System Bus Oscillator
2:48:10 Post Upgrade Speedometer Benchmark
2:57:00 Closing Thoughts
3:08:05 Outro
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Ways to Support the Channel:
☕️ Tips or Support via Ko-fi: https://ko-fi.com/jdmcs
🈷️ Support me on Patreon: https://www.patreon.com/jdmcs
📦 Amazon Wishlist: https://jdmcs.net/wishlist
... or simply do the YouTube things: Like/Dislike, Comment, Subscribe, Enable Notifications, and participate in the Chat. These things help the channel, too!
**
Read Computerized Start™, my Official Blog: https://jdmcs.net/myblog
Follow me on Instagram: https://jdmcs.net/myinstagram
Follow me on Twitter: https://jdmcs.net/mytwitter The Macintosh IIsigh: More Diagnostics, More Soldering, More Speed? (Computerized Start™ Live)](https://i.ytimg.com/vi/xykoKhJBmwM/mqdefault.jpg)


