rzh@lll-lcc.UUCP (Roger Hanscom) (01/12/90)
Does anybody have dox for an S-100 Cromemco 8PIO, or know anything about one? I have a bunch of questions about the board. I bought it for scrap, and of course there was no documentation with it at all. /-------------------------------------------------------\ | xxxxxxxx ------- ------- ------- ------- ----- | | | H67 | | H45 | | H23 | | H01 | | R | | | ---------- ------- ------- ------- ------- | 1 | | | | S1 | C R O M E M C O 8 P I O ----- | | ---------- ----- | | ---------- | R | | | | S2 | | 2 | | | ---------- ----- | | | | | | | | | | | \_____ ------------/ | | ---------------------------------------- 1. S1 & S2 are 8 position dip switches. The leftmost 5 bits of S2 set the MSB of the card address (A3->A7), and then the 25-pin headers (H0->H7) are the 8 parallel ports counting up from the base address. What are the rightmost 3 positions of this switch used for?? They are marked D0->D2. 2. The x's represent 8 LEDs that seem to be controlled by the 8 bits of S1, and seem to appear on port7. Surely there must be more?? What am I missing?? 3. Each 25-pin header (Hkl) has the following pin-out: ? 0 1 2 3 4 5 6 7 ? ? ? * <---port l ? ? ? 0 1 2 3 4 5 6 7 ? ? <---port k where pin * is cut off. I can find the bit positions (as shown), and the ?'s are probably handshakes, etc. But which are what? R1 and R2 are relays, and R1 audibly latches on pins 0 and 1 of port 1. What are they used for and how? 4. To the left of the relays there are jumper positions marked: NC, Jn-24, Jn-23, and PIC, where n is 4 for R1 and 3 for R2. What are these for? Jn-23 and Jn-24 are connected to pins 23 and 24 of H01 and H23. Do bits 0 and 1 of ports 1 and 3 supply AC or DC to pins 23 and 24 of the header? The relays are marked: "*SIGMA (* is a backward RU) 60RE1S-5DC 1A,28VDC .5A,120VAC" The board has an optoisolator on it MCT66, and one other jumper (factory installed??) labeled "Port 6 out". It is: REV. E1, MOD LEVEL 1. The card is in really good shape, and is quite usable, as long as I can get some help on these questions. I will appreciate any clues. roger rzh@lll-lcc.llnl.gov