--- ajp166 <ajp166_at_bellatlantic.net> wrote:
> IDE is fairly stupid and easy to interface as PIO, DMA would not be that
> bad for vax or PDP11 but you would pay for it by needing drivers as
> there are none.
.
.
.
> RT-11 and the overlay TSX-11 are easy compared to something like VMS.
I've written VMS drivers from scratch (for the VAXBI COMBOARD) and I've
dug deep into someone else's code for an AmigaDOS IDE driver (PIO via
ISA interface and GG2 Bus+ ISA bus adapter). If it were possible to
make an inexpensive IDE adapter for Qbus, I'd be more than happy to
tackle a driver. I've got a couple of uVAX-IIs, KDF11 CPUs, etc., so
the rest of the system is no problem.
Has anyone designed a quick-n-dirty Qbus IDE adapter? If one is willing
to let the VAX processor do the work, it could be as simple as mapping
the I/O registers of the IDE drive into some I/O addresses. Not much
more than a few Qbus drivers and an address comparator, a la older ISA
IDE cards. It would probably heavily tax most CPUs, though.
-ethan
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Received on Mon Oct 16 2000 - 14:49:24 BST