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Dan, The 80188 and 80C188 are slightly different chips. The 80C188XL, I am pretty sure is compatible with the AMD N80C188-25 chip that Andrew distributes. I have also tested the Intel N80C188, no suffix. It is a lower clock rate. The design speed of the board was 16Mhz (32Mhz oscillator); without the 4MEM board, the lone board has been run by both Sergey and me at 25Mhz (50Mhz oscillator). The board revisions are printed on the SBC-188 CPU board: 00.4 -- the earliest -- needs several updates (Update-2010-10-25.txt) 1.0.005 -- the version 1.0 board -- has all the revisions The 00.4 is printed near pins A32,B32,C32 of the ECB connector. The "rev 1.0.005" is printed in the middle of the board. The 00.4 board can be updated to 1.0.005 by installing all of the h/w mods, including adding a chip to the FDC logic. Jumper settings may also affect proper operation of the board. J8 (1-2) is the critical one. The schematic has a table of jumper settings for the various size and type of ROM chips. BIOS037 does a P.O.S.T. (power on self test) of memory when it starts. It should correctly report the size of the SRAM chip you are using. It should also report the CPU clock rate accurately. --John On 07/09/2011 09:45 PM, Dan Werner wrote: Now that the pace at work is slowing down to a "normal" level, I am trying to get caught up with the current state of all of the boards. While I am focusing on 6802 FLEX, I am currently waiting on parts, so I decided to get my SBC-188 working. It does appear to be working somewhat, but it has some sort of IO problem (no floppy activity of any kind, and it does not seem to be storing the NVRAM correctly). So I thought I would start by making sure that the 80c188XL-20 chip that I am using is compatible, and to ask which chip others are using? I am using BIOS37 and the V1 board. Thanks! Dan Werner |