Bun's Lab – Telegram
Bun's Lab
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Electronics projects, vintæg computing, programming and repairs. A minimalist blog of sorts.
@BunsGarden @BunsNook
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Make that double
And this beauty also showed up at my door. I don't plan to permanently adopt it. But the person who found it was about to gut it and put a Bluetooth speaker in. And I could not let that happen.
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Bun's Lab
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Another look at this. And I think the chipset and/or CPU is toast. There isn't much else on the board that could die from ESD, and a bus local to the chipset and CPU shows those runts. Guess it goes into the parts bin 😢
I found this filing cabinet for a euro or so at a flea market. Put ESD foam in, it's going to be a chip storage now.
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Bun's Lab
Ok I'm bummed out now. My 286 broke. This one:
I gonna put this board in there now. 20Mhz Harris 286.
Bun's Lab
I gonna put this board in there now. 20Mhz Harris 286.
Ok so, this board was working when I last touched it. Now it's not. No beep, no video output, nothing, not even anything on the POST code card, just - - - -
Clock is there, activity on the bus, the CPU is not being halted. Activity seems to be a very tight loop.
Replacing the CPU, RAM, does nothing, so does messing with the jumpers. BIOS EPROM reads out fine, but I have yet to check the parity checksum. Replacing the keyboard connector also does nothing, BUT, if it's out, it starts up.
Cold start results in a short beep, with the message "8042 GATE A20 ERROR SYSTEM HALTED" (of course it's unhappy about a missing keyboard controller), with POST codes being (in reverse order):
43 42 41 40 3b 3a 39 38 37 36 35 2e 2d 2c 2a 29 28 26 25 24 22 21 20 15 14 13 12 11 10 0f 0e 0d 0b 09 07 06 03
A soft reboot results in black screen and 7 short beeps
Ok so scoping that out, VCC and Ground on the keyboard controller looked like a data pin. Someone suggested I have the sockets mixed up, and yes I did. The keyboard controller goes in the other 40 pin socket, the one furthest from the keyboard. Of course it does!

(I had this out before to test a different board with, seems like I didn't pay attention. And of course the sockets are not labeled)

I feel so dumb. Real bun moment. No brain, just fluff.
Nothing wrong with deez NAD, just having a look 👀

(It's not mine)
Sorry for the mess on the table
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feeling kinda qt, might delete later idk
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I bought a DS at a flea market and there's some cursed stuff on there
Recently picked up this General Electric EE7-4325 flip clock radio at a flea market for Eiliko over at https://news.1rj.ru/str/eilikosretrostube

Time to ship it to him :3