26 Feb
2022
26 Feb
'22
11:36 a.m.
On 2/26/22 12:15, js--- via cctalk wrote:
On 2/25/2022 5:09 PM, Will Cooke via cctalk wrote:
Thanks very much Paul, Will!
From info gleaned from this webpage (especially the comments at bottom):
http://www.mattmillman.com/projects/hveprom-project/an-easy-to-build-mcs-48…
... indeed looks like there is a chance the HP's 8048 could be read and
possibly programmed into an alternate part. However, it's a daunting
task in my case.? I'd first have to build a 8048 programmer/reader
shield for an Arduino, and then try to get my cracked 8048 successfully
unsoldered from the HP 9915A motherboard, and then attempt to get
consistent reads from it -- a special challenge due the crack.
As the chances of success are highly improbable, looks like I'm SOL on
this particular motherboard.
Anyone have a HP 9915 they'd like to sell?
Could the PROM be read by a running machine? Could someone who has one
working read it and send you a copy of the image?
bill
On
02/25/2022 2:23 PM Paul Berger via cctalk<cctalk at classiccmp.org>
wrote:
The 8048 is a mask programmed part, there is an EPROM version 8748.
While the 8048 is mask programmed I believe that the contents of the ROM
can be dumped.
As Paul said, the 8048 is mask programmed.? However, I agree it is
readable.? I "think" if you follow the "verify" step in the linked
datasheet you can read from the rom.
https://www.ceibo.com/eng/datasheets/Intel-8048-8049-8050-plcc-dip.pdf
Will