DEC RK07 drive interface specs wanted

From: Paul Koning <>
Date: Fri May 14 11:23:22 2004

>>>>> "Patrick" == Patrick Finnegan <> writes:

 Patrick> I'd tend to agree with that, and add at least an RH11
 Patrick> (massbus) controller to that, so you have access to
 Patrick> large-ish disks (RP07/516MB). As a starting place, I'd
 Patrick> probably use an RL11 as the programming interface looks very
 Patrick> simple (4 registers) and I've got a real one that I can test
 Patrick> against.

Yes, but one of them is the "multi-purpose" register which is pretty
strange. The older controllers are far more sane.

 Patrick> Right. I'd consider doing this with a couple of PALs and a
 Patrick> microcontroller for my first run at it. After working with
 Patrick> FPGAs at school, I vehemently hate having to write VHDL for
 Patrick> them. As well, PALs use cheaper development tools, and are
 Patrick> usually cheaper for small, simple designs, and if you chose
 Patrick> the right ones (AMD's PALCE line), they're easily erasable.

Take a look at Lattice. They have CPLDs which are either oversized
PALs or undersized FPGAs, whichever view you prefer. The basic tools
aren't that expensive. And they support a design language called
"Abel-HDL" as well as VHDL and Verilog. I've used it; worked quite

Received on Fri May 14 2004 - 11:23:22 BST

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