24 Apr
2007
24 Apr
'07
12:54 p.m.
Subject: Re: Junkbox CP/M system?
From: "Ensor" <classiccmp at memory-alpha.org.uk>
Date: Tue, 24 Apr 2007 05:16:45 +0100
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
Hi,
It's rarely implemented and its not a "line" it was part of the command
set.
The line IO16 is an output that goes high when sector transfers happen.
I have a few XT IDE and of the 4 only one drive (20mb) does 8bit the rest
depend on the ISA bus card to do translation (8-16).
CF IDE is easy--it's 8 bit. HD IDE uses a
16-bit data path for
sector data transfer....
The original IDE drives used 8-bit transfers (I had one in my first XT),
even to this day there is still be a signal on the IDE interface to force
the use of 8-bit mode.
At least one of the IDE interfaces available for 8-bit Atari machines uses
the drive in this mode.
TTFN - Pete.
What drive? YOu can of course use CF that has 8bit mode or just ignore
the high 8bits (loose half the space) for a simpler interface.
Allison