HP 9915A failed 8048

[Bill Gunshannon]

On 2/26/22 12:15, js--- via cctalk 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?
> 

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