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I am trying to fix a Newbrain computer and the problem after i repaired the video is that the total memory is 5524 bytes which means i have a problem with Ram Bank 1 and since the problem is that the d5 of that address is always 1 the faulty ic is the 403 os Storage Board.
I switched the banks shorting PIN1 and PIN6 on the expansion and now the total memory is 21906 Bytes so bank2 is ok.
As i said i will probably replace this board with a custom one i am designing and use a 32k Static ram instead of all these dram ics.
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