On Tue, Jun 29, 2004 at 01:30:39PM -0700, Tom Ponsford wrote:
> And finally A Quad height Qbus board with a Motorolla MC68000l12 processor
> and a paper label at the bottom of the board that says:
>
> 590139
> BUS CPU
> REV A
> EXTREL 2MHZ
>
> It also has 2 Zilog Z80 chips a
> Z80B CTC and a
> Z80 UART
>
> So is this a motorola 68K Qbus board??
I don't recall anything about "Extrel", but unless this card was at the
top of the bus, it was a peripheral card, not the primary CPU (you have
to put the CPU at the top because boards "above" the CPU wouldn't be able
to break the grant chain for interrupts or DMA requests).
The Software Results COMBOARD was a peripheral for the Unibus, Qbus or
VAXBI bus with a 68000 (or 68010) on it. Since we spoke sync protocols
out the serial port(s), we had either a COM5025 or a Zilog Z8530, so seeing
a Z80-family UART on this board isn't all that strange.
IIRC, the DMB32 has a 68000 as well.
The other peripheral CPU I've commonly seen is the T-11 - DEC used it on
several cards, as did Simpact (a Software Results competitor). I even
have a Simpact card, but no software.
So what sorts of connectors are coming off the top of the board? 40-pin
Berg connectors were commonly used for serial ports (DL11E, DUP11, DUV11...)
but with a 3rd party board, there's no standard.
-ethan
--
Ethan Dicks, A-130-S Current South Pole Weather at 30-Jun-2004 02:40 Z
South Pole Station
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Ethan.Dicks_at_amanda.spole.gov http://penguincentral.com/penguincentral.html
Received on Tue Jun 29 2004 - 21:48:10 BST