Yes a typo, there is no K1 on the V2 board. The equivalent (Phantom*) jumper is JP5 on the V2 board. Will correct the web page. On K5, this is the way IBM had these pins on their original PC motherboard. Not sure why or what for! JP6 is to insure the critical Open Collector S100 bus line sINTA has at least one pull-up somewhere on the bus. There should only be one. If you have multiple CPU cards, make sure only one is pulling the line up (and in fact, all other CPU driven S100 OC lines). Normally our Z80 CPU board does this. So usually – unconnected. For MSDOS to boot etc., the P39/P37/P53 jumpers are not used. The RTC is used to get the actual date/time on boot up, but the 8254 interrupts keep track of time after that. I actually use our Console I/O board keyboard input (with S100 bus, VI1*) for MSDOS. Should be VI1 direct to the PIC for MSDOS/IBM PC compatibility. Good luck with it. John From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Richard Cini All — I just finished assembling the board, testing as much stuff along the way as I could with the Z80 board. Things seem to work fine, but I have a few clarifying questions. I hope to use this board, initially, as a proxy for the Seattle Computer Products CPU Support Board as part of a system re-creation/demo project I’m working on. I have the SCP-200B 8086 board, the Cromemco 16FDC, an SSM IO4 (console card) and a CompuPro RAM22 (which subs for several SCP 16k memory boards). I hope this will approximate the system Tim Paterson used to create 86-DOS. Here are my questions:
Are there any other gotchas I should be aware of? Thanks! Rich -- Rich Cini Collector of Classic Computers Build Master and lead engineer, Altair32 Emulator -- |