First post, by krivulak
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Hi, I got this (maybe turbo) XT board. Seems really nice, doesn't it? 😀
The bad thing is I got it without CPU, so I had to dig one from Commodore PC20 and I don't even know if it is in correct slot or even correct CPU. Worse - I can't read the ROM because MiniPRO has no idea about existence of this chip. Even worse - the motherboard appears dead at the moment. In the very second of applying voltages the speaker goes wild on loud low-pitched beep (not that low, just lower then normal boards) and doesn't stop until the PSU is turned off.
I would like to dig more thoroughly, as a matter of facts - I would anyway, but without datasheet it is really sad and very, very time consuming job. Wandering all around with a multimeter with no idea where to start. I can't even go through the route of tracing burned board or rotten tracks after battery going berserk, because the board has none of that.
Any help is appretiated 😀
By the way - all the work done to this time on this board is that I tested all of the 256×1 DRAM chips on my tester, every single has passed. CPU is known good and all of the chips with V on it were tested on other board and worked aswell.