data sheet for com5025

[Ethan Dicks]

On 8/21/06, dwight elvey <dkelvey at hotmail.com> wrote:
>
> Hi
> Does anyone have a pointer to a data sheet for a com5025? I believe
> it to be a synchronous serial chip but I've not found much on the web.

We used the COM5025 on the Unibus versions of the COMBOARD.  I have
several hundred of them new in tubes, FWIW.  We used them for
byte-oriented synchronous serial protocols (HASP, 3780) and switched
to the Z8530 to support bit-stuffing protocols like SNA.

I do have data sheets on them, but not yet scanned, and in any case,
10,000 miles from here.  I would think that someone on the list could
come up with an electronic copy months before I could.

> I think it is compatable with a 2652 but the only thing I can find on that
> is a 16 bit part from Philips. I don't think this is a 16 bit appliction.

I don't have any information on the 2652, but in the case of the
COM5025, it's found on a couple of DEC's sync serial boards (DU11?),
that's why we used it.  The COMBOARD was the descendent of the
HASPBOX, a product that was 100% DEC hardware (either an 11/04 or
11/03 with a 16-bit parallel link back to the (big) PDP-11 host and a
DEC sync serial card to the IBM box on the other end of the link.
Essentially, the COMBOARD was a single-board implementation of the
HASPBOX with a 68000 as the processor rather than a PDP-11.  As such,
I _think_ the COM5025 works on either a 16-bit or an 8-bit host bus,
but we always had them on 16-bit CPUs.

-ethan