Weird S100 memory board problem

Allison ajp166 at
Fri Jul 22 22:21:42 CDT 2005

>Subject: Weird S100 memory board problem
>   From: "Richard A. Cini" <rcini at>
>   Date: Fri, 22 Jul 2005 22:57:54 -0400
>     To: CCTalk <cctalk at>
>	I have a CompuPro/Godbout RAM14 (16kx8) board, arranged in 4 banks
>of 4k starting at 0. I ran a memory test program on it and it shows address
>0x3000 as failing; when you look at data written, it appears that BIT 0 is
>	So, I ordered some 2147 chips from JDR and swapped the bad chip. It
>still fails the same bit. So, I swapped it with another chip in the row, and
>it fails again. It passes at address 1000 and 2000, so it can't be an
>address bit buffer chip.
>	Any ideas? Where should I look next?

Sounds like a data buffer problem either in the data in lines or 
data out lines.  Or it could be the data in or out line for that 
bit is bad to the chip (socket or open trace).



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