I briefly checked it, first let's enumerate the negatives:
- unfortunately, C104 near the power supply connector died in the process of fixing a short circuit :-/
- SCSI controller (UA02) in the top right corner is not only missing but its socket is totally destroyed (wasn't me, I swear!
)- the bottom right corner seems to be, ehem, missing (but no traces beneath it)
- the FPU is missing (crucial for the TOS to boot to desktop!)
- there is an empty slot on U300's place, looks suspiciously clean but that is supposed to be the MIDI ACIA, so...
- the cartridge slot bracket is quite corroded but the port itself seems OK, +5V is there
- the VME bracket is missing (but the PCB is there, hanging from the bottom of the PCB)
- the reset button looks pretty horrible but works OK
- what you see is what you get: no PSU, no ST RAM card (but of course the 2 MB are built-in), no TT RAM card, no keyboard (although I will be selling a MegaSTE one in a near future)
When it comes to diagnostics, after fixing a short circuit I briefly checked the CPU: it seems to halt on a bus error, the diagnostic cartridge doesn't produce anything on the serial output. It seems to be stuck in a reset loop (perhaps due to that bus error), video is repeatedly enabled/disabled. However, once, when pushing the reset button repeatedly I was able to display a white screen, again hinting that the machine is not totally fried.
Another good news is that this is the rev. A so not only the CPU is on the daughter board (do I hear easy Speedy installation?) but also most of the chips are socketed.
I want to emphasise that this is by no means a board to fix in one afternoon, definitely expect a journey similar to Jookie's: viewtopic.php?f=23&t=4353.
Jookie told me that he bought that board for 300 EUR in 2021. Let's pretend that inflation didn't happen, I'm offering it for the same price, too. *Not* offered anywhere else yet, as I'm convinced that this forum's audience should get the opportunity first (bonus points if you publish the repair process!). Located in Slovakia/EU.
