Playing with HP2640B
mattislind at gmail.com
Tue Dec 5 11:14:21 CST 2017
2017-12-05 16:51 GMT+01:00 Mike Loewen via cctalk <cctalk at classiccmp.org>:
> On Tue, 5 Dec 2017, Mattis Lind wrote:
> 2017-12-05 16:26 GMT+01:00 Mike Loewen via cctalk <cctalk at classiccmp.org>:
>> On Tue, 5 Dec 2017, Mattis Lind via cctalk wrote:
>>> While going through the HP2640B I found two boards which I cannot find
>>>> relevant schematic and description for, the 02640-60009 Display Memory
>>>> Access Module and the 02640-60088 Display Timing Module. Anyone has more
>>>> info on these?
>>> The manual for the 02640-60088 is here:
Looking more into this document revelas that it covers three boards
02640-60009, 02640-60088 and 02640-60112.
Now I had the idea of dumping the character ROM as well. But what is a AMD
27S82? I cannot really find a datasheet online. From the schematics above
it looks not too much off from standard 2716 EPROM with pin 19 (A10) as E3
, pin 21 (VPP) as /E1. But my Data I/O 29B does not seem to be compatible
with 27S82 and as pin 21 is active low it gives that a 2716 setting in the
programmer (reader) won't work.
Does the 27S82 have any equivalents that I could look up instead in the
>> Thanks! Those numbers fooled me. Some time the number seems to correspond
>> bit between the number on the board and some times not.
> The Data Terminal Technical Information Package contains a
> cross-reference for PCAs and Module numbers. Unfortunately, it doesn't
> list the 02640-60009.
> Mike Loewen mloewen at cpumagic.scol.pa.us
> Old Technology http://q7.neurotica.com/Oldtech/
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