AT&T 3B1 / 7300 / UNIX PC DMA Data LSI schematic

[Steven Hirsch]

On Sun, 12 Dec 2010, Philip Pemberton wrote:

> Hi guys,
>
> I'm trying to track down a copy of the schematics (if any still exist)
> for the DMA Data LSI used in the AT&T Unix PC (aka the AT&T 3B1 or AT&T
> 7300).
>
> The Technical Reference Manual scans which were posted here earlier
> include the DMA Address LSI, but not the DMA Data LSI. Unfortunately
> about 80% of the DMA logic is in.... *drumroll*... the Data LSI. The
> Address LSI is basically a glorified presettable up-counter.
>
> These should be in the AT&T UNIX PC Technical Reference Manual, if
> anyone has a copy kicking around. I already have the DMA Address LSI,
> Video LSI, 512k Motherboard, 1MB Motherboard and 2MB Motherboard
> schematics.

There is nothing pertaining to the DMA Data LSI in any of the 
documentation I have.  Are you sure it was included in the technical 
manual?  I scanned everything I have here.

Steve


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