Wanted: M9312 ROMs

From: Joe R. <rigdonj_at_cfl.rr.com>
Date: Thu May 27 19:38:06 2004

At 10:11 PM 5/27/04 +0100, you wrote:
>Joe R. wrote:
>> Doesn't the M9312 use Bipolar PROMs?
>Yes, they are 74S571N, Am27S13 or 82S131N devices (2048 bit).
>> Does anyone know the part numbers of the blank ones or have a source for
>> them or a programmer that can program them?
>I have a programmer that can read and write them, a Stag PPZ with
>Zm2000 EPROM module.

  Cool! I have the same programmer and I thought it would program them but
I wasn't sure. My Pro-Log programmer will program too but you have to have
different plug-ins for the different brand parts.


 The PROMs are 4 bits wide, which means that
>the PDP-11's 16-bit words are stored in a somewhat strange manner.
>In fact, some of the bits are stored inverted, too. The M9312
>manual describes it all, though, and I've written some code to
>un-mangle the data (which seemed to work).
>John Honniball
Received on Thu May 27 2004 - 19:38:06 BST

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