HP 9915A failed 8048

[Paul Berger]

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.

Paul.

On 2022-02-25 16:09, js--- via cctalk wrote:
>
> Hi, folks.
>
>    I've a HP 9915A computer with an interesting problem.   The 
> motherboard utilizes a ceramic Intel D8048 chip.   The problem is that 
> this 8048 has a crack right across the top middle of it, and half of 
> the top of the chip has begun to separate.
>
>   Powering up the machine as-is unsurprisingly results in no 
> activity.   HOWEVER, if I push firmly on the cracked area with my 
> finger the machine starts to operate normally.   All appearances are 
> that clamping down the separating piece of the chip re-establishes any 
> broken wire connections within the chip.
>
>    I've obtained a replacement P8048AH.   My question is: do these 
> chips simply swap like a CPU, or -- as I fear -- is the 8048 a 
> pre-programmed piece?    More simply put, is this a repairable 
> problem?  Or am I SOL?
>
>    Any thoughts welcomed.
>
> - John Singleton
>