24 Apr
2007
24 Apr
'07
12:48 p.m.
Subject: Re: Junkbox CP/M system?
From: "Chuck Guzis" <cclist at sydex.com>
Date: Mon, 23 Apr 2007 17:32:21 -0700
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
On 23 Apr 2007 at 18:47, Jules Richardson wrote:
One thing, you do not have to use D8-15! Sur you give up half the data
in a sector but you also eliminate a lot of hardware. That and even an
old 100MB drive will yeild 50mb which by CP/M standards is the world in
a bottle.
Allison
From a programming point of view, how easy is
accessing IDE compared to a
typical FDC ('765 or similar)? I did write some assembler to access an IDE
drive about 12 years ago, but have long since forgotten details! :-)
CF IDE is easy--it's 8 bit. HD IDE uses a 16-bit data path for
sector data transfer, so that makes things a bit more involved.
Otherwise, the register set looks pretty much like a WD1003 PC-AT
type disk controller.
Cheers,
Chuck 
24 Apr
24 Apr
4:21 p.m.
On 24 Apr 2007 at 7:48, Allison wrote:
One thing, you do not have to use D8-15! Sur you give
up half the data
in a sector but you also eliminate a lot of hardware. That and even an
old 100MB drive will yeild 50mb which by CP/M standards is the world in
a bottle.
I've seen that done on at least one TRS-80 lashup. You need to
remember that your sectors thus accessed are 256 bytes and not 512,
which may not be a bad thingl for CP/M.
Cheers,
Chuck
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