HP 9915A failed 8048

[Wayne S]

John, there are a few 40 pin test clips that you might be sblebto use to connect without unsoldering the chip.
Maybe this ...you’ll have to look carefully...

https://www.newark.com/tenma/spc15160/test-clip-40position/dp/79K4766?st=40%20pin

Sent from my iPhone

On Feb 26, 2022, at 09:19, js--- via cctalk <cctalk at classiccmp.org> wrote:



On 2/25/2022 5:09 PM, Will Cooke via cctalk wrote:
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


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-48-8748-8749-8741-8742-8048-8049-programmer-reader/


... 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?

- John Singleton