Docs for DRV-11?

From: Chuck McManis <cmcmanis_at_mcmanis.com>
Date: Fri May 11 19:27:05 2001

It turns out this is the DRV11-WA (Module M7651) which is a dual wide,
Q-bus, DMA capable, 16 bit I/O port. (Very cool as far as I am concerned).
I actually found another one of these in my spares bin so I've actually got
two.

Megan's field guide page makes it out to be 18/22 bit compatible so that it
can probably DMA into and out of pretty much any part of Q-bus memory
space. The MicroVAX will let me map pages of its memory into the Q-bus
space so I can presumably DMA things out of VAX memory and into some
peripheral.

This differs from the M7941 which is also a 16 bit interface but does not
do DMA.

I've got the 1980 LSI-11 peripherals handbook which talks about the DRV11-B
which is quad wide (M7950) which appears to be the predecessor to this
board, it can only do 18 bit DMA.

I'll bet a zillion dollars that the pin out on the two connectors is
identical :-)

So if I can figure out when the 7651 was introduced I might be able to find
a handbook that covers it. I've got a spare 1980 handbook I'd be willing to
trade for a 1985 or thereabouts.

And to whomever was wondering about MSCP. No, I don't expect to do MSCP! I
built a "bit banger" SCSI interface for the Z80 once out of a PIO chip and
a couple of flip flops. If you make simple assumptions like SCSI-1, Only
one target on the bus besides you, asynch I/O only, etc. It isn't hard to do.

--Chuck


At 07:16 PM 5/11/01 +0100, you wrote:
> >
> > How will the DRV-11 help you hook into MSCP? It's a good and VERY flexible
>
>Who said anything about MSCP. I assumed he was going to make a
>hardware-compatible SCSI interface, and then write a special driver for
>whatever OS he's running to set the lines to the appropriate states in
>the right sequence. No reason why that wouldn't work -- plenty of the
>older DEC disk drives weren't MSCP devices.
>
> > card, but not intended for use as a file device. It does, of course,
> support
> > DMA.
>
>Some DR(V)-11 versions support DMA (the -W does, and certainly the DR11-B
>does -- is there a Qbus version of that?). Others don't.
>
>-tony
Received on Fri May 11 2001 - 19:27:05 BST