Playing with HP2640B

[Mike Loewen]

On Tue, 5 Dec 2017, Mattis Lind wrote:

> 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:
>>>>
>>>> http://www.hpmuseum.net/document.php?hwfile=2542
>>>
>>>
>
> 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
> device list?

    I couldn't find that part number either, but I dumped the PROMs on my 2647A 
Control Memory PCAs, which use an AMD AM9216BDC PROM.  It appears to be set up 
the same way as you describe.  I hand-wired an adapter to plug into my 29B, 
and told it that I was reading a 2716.  The datasheet for the AM9216BDC is in 
the AMD MOS/LSI Data Book:

http://bitsavers.informatik.uni-stuttgart.de/components/amd/_dataBooks/1980_AMD_MOS_LSI_Data_Book.pdf


Mike Loewen				mloewen at cpumagic.scol.pa.us
Old Technology				http://q7.neurotica.com/Oldtech/