Re: Replacing ST-506 MFM Drives with IDE or Flash
- From: jgh@xxxxxxxxxxxxxxxxxx (Jonathan Graham Harston)
- Date: 23 Apr 07 20:20:20 GMT
Message-ID: <E1Hef8d-0005et-SH@xxxxxxxxxxxxxxxxxxx>
Al Kossow <aek@xxxxxxxxx> wrote:
So comp.os.cpm, any comments?
When I did an equivalent thing for the BBC computer I just
designed an IDE interface that connected directly to the address
bus and modified the hard drive access code, rather than try and
build something that plugged into an existing drive port and
pretented to look like the drive to the hardware. It just looks
like the same drive to the software instead.
fine condition (except when you have to do 16 bit to 8 bit conversion
for 16 bit ide). Wasn't there a design that even did away with that by
just masking the upper byte and using the lower 8 bits of every
That's exactly what I do. Read and write each data word, and only
use the bottom 8 bits of it. Drops a 800M drive to 400M, but
that's still 20 times bigger than the the originally supplied
drives.
There used to be available a z80 socket piggyback board like the
copower board that offered an ide port, came from somewhere in
There's a list of documents I refered to when designing my IDE
interface at http://mdfs.net/Info/Comp/BBC/IDE/8bit I think that's
one of them.
--
J.G.Harston - jgh@xxxxxxxxxxxxxxxxxx - mdfs.net/User/JGH
There are three food groups: brown, green and ice cream.
--
J.G.Harston - jgh@xxxxxxxxxxxxxxxxxx - mdfs.net/User/JGH
BBC IDE Hard Drive Interface - http://mdfs.net/Info/Comp/BBC/IDE
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