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Date   : Fri, 12 Jan 1990 06:08:49 GMT
From   : rzh@lll-lcc.llnl.gov (Roger Hanscom)
Subject: S-100 Cromemco 8PIO ... help?

  
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

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