> On Jul 2, 2025, at 11:13 AM, Jon Elson via cctalk <cctalk@classiccmp.org>
> wrote:
>
> On 7/2/25 06:08, P Gebhardt via cctalk wrote:
>> Dear list members,
>>
>> I was wondering if anybody is aware of VAX 86x0 schematics having survived
>> the product life cycle within DEC? I searched the web extensively but could
>> not find any hints on this.
>> It seems that DEC never published such details as schematics for the
>> successor of the VAX 11/78x systems, not even on microfiche, maybe due to
>> the macrocell array implementation (just a guess). All I could find is that
>> there were illustrated parts list on microfiche.
>> However, maybe Hewlett Packard handed DEC-internal documents over to a
>> museum such as the CHM? Or a former designer still have schematics in their
>> archives?
>> Any pointers would be greatly appreciated!
>
> I did have a KA630-AA print set at one time. That was about the latest
> prints I have seen.
>
> Jon
That makes some sense. Print sets were needed in older machines because FE
would actually replace failed components on a board. With "swap the failed
board" repair procedures, it isn't all that useful for support engineers to
know how a board works, much less what the detailed circuitry looks like.
paul
