at&t unix pc

Mark Davidson mdavidson1963 at
Mon Oct 11 21:48:49 CDT 2010

On Mon, Oct 11, 2010 at 4:34 PM, Dave McGuire <mcguire at> wrote:
> On 10/11/10 6:28 PM, Ethan Dicks wrote:
>>>> I don't presently have one, but if I do ever run across one, I'd want
>>>> to make sure I had a "StarLAN" card (1Base5, for the pedants in the
>>>> crowd) - I even have a few official StarLAN transceivers and such -
>>>> they work fine on a 10BaseT network.
>>> StarLAN does *NOT* operate on a 10BaseT network.  The signalling is
>>> similar, but the data rate is 1 Mbps rather than 10 Mbps.
>> Apologies for any ambiguity, but to be clear, the genuine StarLAN
>> transceivers I have are working fine on my 10BaseT network at 10Mbps,
>> not 1Mbps.  I was not trying to suggest you could plug a true 1Base5
>> StarLAN network directly into a 10BaseT network.
>> Is it possible that different kinds of devices were all badged "StarLAN"?
>  You're talking about StarLAN-10, which is very different from StarLAN.  I
> don't recall if they were labeled as such.
>            -Dave

Ok, I pulled out my 'black binder'.  It's a copy of the AT&T Unix PC
Reference Manual, and is for technicians doing component-level
troubleshooting of the AT&T Unix PC logic board.  It's pretty thick
and contains sections on:

* System Features and Functions
* Logic Board Theory of Operation
* Diagnostics
* Logic Board Test Procedures
* Schematics
* PAL Equations
* Mnemonics
* Expansion Memory Locations

As I said, it's pretty thick... has this been preserved in digital
form somewhere?


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