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smaller HP 82166A with 32-pin connector
09-14-2019, 07:50 AM (This post was last modified: 09-14-2019 07:56 AM by Klaus Overhage.)
Post: #1
smaller HP 82166A with 32-pin connector
The technical manual of the HP82166A HP-IL Converter describe a device with a 34-pin GPIO connector. The one I bought is a little bit smaller and with a 32-pin connector. I worked out the pin assignment of this device as good as I can from looking on the pcb.

Has anybody seen this variant of a HP82166A before and maybe can confirm the pin assignment?

Code:
           | <== upper plastic edge
        ----
RXO  32 |  | 31 +5V
-CS  30 |  | 29 (+5V)
DAVO 28 |  | 27 RDYI
RDYO 26 |  | 25 DACI
PWON 24 |  | 23 GND
DACO 22 |  | 21 HLLO
DB7  20 |  | 19 DAVI
DB5  18 |  | 17 DB6
DB3  16 |  | 15 DB4
DB1  14 |  | 13 DB2
DCLO 12 |  | 11 DB0
MSRQ 10 |  | 09 GET0
DA6  08 |  | 07 DA7
DA4  06 |  | 05 DA5
DA2  04 |  | 03 DA3
DA0  02 |  | 01 DA1
        ----
           | <== upper plastic edge


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09-14-2019, 08:43 AM
Post: #2
RE: smaller HP 82166A with 32-pin connector
No I didn't know this variant. It seems that it's a pre-production variant still using discrete pulse transformers.

When I started to work on HP-IL in the 80's I got a HP82166 prototype - I don't have it anymore - that was using similar pulse transformers and also had a 32-pin connector. See attached image with the proto side by side with a production unit.

Note that the layout changed in the final HP82166 with the MCU and 1LB3 swapped.

J-F


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09-16-2019, 07:23 AM
Post: #3
RE: smaller HP 82166A with 32-pin connector
Thank you for your explanations. Then this device is probably not so strange and could work. It already has the same MCU as the production unit. But the ICs are still rotated as in your prototype. That explains probably the strongly deviating PIN assignment of my variant compared to the technical manual. The name is displayed by the HP-41CX with CCD module in Catalog 0 as HP82166A.

In the meantime, I was able to build the simple circuit from the book "Control the world with HP-IL", page 42. Instead of a 74C373, a 74HCT573 is used. The tests, whether so 8 LEDs can be switched were all positive. The DA0-DA7, DAVO, RDYI, DACI, + 5V and GND connections are all correct. The "Count" program on page 44 ran to 255 in 96 seconds. With the HP-71B, a flickering light looks very pretty.
Code:

10 RESTORE IO
20 A=DEVADDR("%64")
30 ENDLINE ""
40 X=1
50 FOR I=1 TO 8
60 OUTPUT :A; CHR$(X)
70 X=2*X
80 NEXT I
90 FOR I=1 TO 8
100 OUTPUT :A; CHR$(X)
110 X=X/2
120 NEXT I
130 GOTO 50
140 END


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09-16-2019, 02:23 PM
Post: #4
RE: smaller HP 82166A with 32-pin connector
Dos anyone have one of the prototypes with the piggy back EPROM like the one in M. Garnier's photo? I would really like to get a dump of that EPROM.

Paul.
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