Notes on the boards                        Updated 20191007

See pic http://everist.org/pics/pcbs/stack_numbers.jpg
for the numbering of board stacks, as used in these notes.
"Pic: xx" refer to the photos in pics.zip

(*) All the long narrow boards with a single long gray ejector lever,
    are for the HP 6942A Multiprogrammer.
    See http://www.hpmuseum.net/exhibit.php?hwimg=533 for the HP 6942A.
    Types mostly not yet determined.

Stack
=====
1   HP 44430A  12 bit optically isolated DtoA with current output. Qty 13 or 14.  pic: 02.
    Used with HP 3497 data acquisition system. 
    All spoken for. (I bid primarily for these.) "1 or 2" going to CuriousMarc. 

2   (*)  Qty: 16. Pic: 05.
3   (*)  Qty: 15. Pic: 06. 
    HP 69771A Digital input for HP 6942A.
    Stacks 2 & 3 appear to be the same board? 

4, 5, 6  Memory boards for the 9826 and 9836 computers  Qty: 37. Pic: 10, 11.
    Card ejectors: red and yellow - say it's a 256kB board, NOT the 1 MB ones.

7   HPIB interface for the HP 6942A Multiprogrammer?   Qty: 11. pic: 02
    All have have socketted chip removed by seller. 

8   (*) Ejector lever says "FET SCAN 64"    Qty: 6?  Pic 03
    HP 69754A Relay Scanner card for HP 6942A.
    Protective cover. "dust or fingerprints on this assy can degrade accuracy"
    May not all be the same board type.

9   ?  Big square board. Qty: 4 ?
10  ?  Big square board. Qty: 6 ?
    "Emulation Bus Preprocessor Rev A   34308L 64304 66501"
    Connectors to Data pods 1,2,3, and a clock pod.

11  (*)  Piggyback edge conn.  Qty 6.  Pic 03.

12  (*)  Qty 6. Pic 04.
    HP 69776A Interrupt card for HP 6942A.
    40-pin DIP intact.

13  ?  Big square board. Qty: 4 ?

14  HP 1000 system serial IO. Ejector says "HS Terminal"   Pics 08, 09.
    Qty: 7. Boards have one red and one grey handle.
    IO interface boards, including HSTs, for the HP 2100/1000 series there.
    HSTs are the basic RS232 & current loop, async serial-line interface boards, 12531D, 
    used for the console and such in the 2100/1000 series, going back to the early machines
    of the series. (HS is 'High-Speed', but that's relative to the late-60s, billed for up
    to 2400bps, but it is possible to operate them at higher speeds.)


15   (*) Gray ejector lever on one side. Qty: 5.   Pic 11.
    40 pin DIP socketted chip has been pulled.

16, 17 (*) Identical boards.  Qty: 5.   Pic 09.
    HP 69770A Optically isolated digital input, for HP 6942A.
    40 pin DIP socketted chip has been pulled. Maybe some corrosion?

18  (*) Same gray ejector lever on one side. Qty 4.  Pic 12.
    40 pin DIP chips still present on top one.
    Cards not all same. Two ejectors read "digital input" and "Timer/Pacer"


It appears there are 14 different types of boards, assuming none of the stacks contain
odd ones out.

Roughly 145 boards in total.


Boards that are offered for sale
-------------------------------- 
All US $30 each (except as noted below) + shipping:
* Most of stacks 4, 5, 6.  256kB Memory boards for the 9826 and 9836 computers  Qty: 37.
* Some of stack 3.         HP 69771A Digital input for HP 6942A.
* Most of stack 14.        HP 1000 system serial IO. HSTs, for the HP 2100/1000 series. (I'm keeping 2.)
* Unknowns - stacks 9, 10, 13.                         US $10 each.
* Ones with missing chips, for spares: 7, 15, 16, 17.  US $10 each.