AUI crossover?

[Tony Duell]

>  Tony> I have a 2 port repeater somewhere (2 female AUI connectors to
>  Tony> link to 2 transceivers), and it's remarkably complciated
>  Tony> inside. There's a state machine type of thing with the state
>  Tony> table in RAM, and a Z80 + ROM to boot that. Probably about 50
>  Tony> chips all told.
> 
> Sounds like a DEREP, which I think is the first Ethernet repeater.
> DEC box, roughly the size of the 3U routers of the time.

No, it's not a DEC product. I forget who did make it (something is saying 
'BICC networks') thought. From what I rememebr, it's a 2U case, could be 
rackmounted. There's one PCB flat inside, and a little SMPSU box.

> 
> State machine with lots of discrete components sounds about right.
> Z80 to boot it is puzzling, what is there to boot?  DEREPs were not

OK, maybe 'boot' is the wrong word. I meant to load the state machine 
RAM.

> manageable, you just turn them on and they would work.

-tony