8050/8250 ROM replacement

From: Jim Brain <brain_at_jbrain.com>
Date: Wed, 05 Dec 2012 12:55:42 -0600
Message-ID: <50BF98AE.6040504@jbrain.com>
At the recent WoC in Toronto, I was trying to help someone with an 8050 
get it running.  He had a working 8250 sitting next to it, and could 
swap the roms from the 8250 and make it work, so we knew the ROMs were 
the issue.

Noting that the ROMs were 2364, he got a simple passive 2364 Adapter, 
and we burned an EPROM with the proper ROM code.  No dice. I looked at 
the (somewhat fuzzy) schematics online, and it looked like the CS lines 
on the 8050 ROMs werfe active hi.  Thus, I tried an adapter with an 
active HI to active LO converter, but again no dice.

I was wondering if anyone else has successfully put 2764 EPROMs into an 
8050/8250 unit, and what was required.


Jim Brain

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Received on 2012-12-05 19:00:12

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