----- Original Message -----
From: <allisonp_at_world.std.com>
To: <classiccmp_at_classiccmp.org>
Sent: Tuesday, April 18, 2000 7:21 AM
Subject: Re: 8-bit IDE
> On Mon, 17 Apr 2000, Richard Erlacher wrote:
>
<snip>
> The S100 systems I have a board of my design and it is quite simple in
> that it buffers address and supplies the low 4 bits of it, a set of
> qualified selects, buffered IO_read IO_write, reset/, clock(2mhz), wait/,
> interrupts and a bidirectional 8bit bus. This makes IO projects as
> trivial as ISA-8 or STD. All brough out on a 50 pin ribbon (alternate
> grounds) as a short 1-2ft cable bus. This matches the Visual1050 bus port
> (very similar) and the VT180 board I hack with that as a similar mod.
> Makes hardware experiementation easy. This is something I implmented
> many years ago.
>
It's not at all strange that you've arrived at that conclusion. I did the
same thing with a channel similar to the WD100x-05 channel, which, by the
way, is normally on a 40-conductor cable with alternate grounds. I even
built one for the XT, back when those were the common box. That, by the
way, is quite somewhat reminiscent of what the IMSAI folks put on their PIO6
board. It's what lives on that little 26-conductor (2x13) in the middle of
their PIO6's top edge. It gives you a channel for external expansion.
>
> Allison
>
Received on Tue Apr 18 2000 - 09:55:44 BST