24 Aug
2012
24 Aug
'12
7:54 p.m.
-----Original Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-
bounces at classiccmp.org] On Behalf Of Dave McGuire
Sent: Friday, August 24, 2012 10:07 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: GIDE replacement?
On 08/24/2012 09:41 PM, Chuck Guzis wrote:
8-bit mode is required by the CF standard. It's not required for IDE,
and
If it
helps, I made an ATA interface for my Z80 single board computer.
It uses five IC's (two 74374's, one 74245, one 74367, one 7432). It
can't support DMA as the high and low bytes of the 16-bit bus are at
different addresses, but it's easy to make.
Just about any CF card can be set to operate in 8 bit mode. Same goes
for Microdrives. So the circuitry can be very simple indeed if all
you are going to use are the CF cards. most IDE devices don't implement it. I've
seen a few very old ones that
do,
but that's about it.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
Hi Dave! Thanks! Yes, that's why I would keep the new board 16 bit so that
it is compatible with a broad range of IDE devices including CF *and*
parallel IDE drives. Also the extra features of the XT-IDE V2 would be
useful like the option UART for remote booting from a serial port server.
Apparently the XT-IDE V2 remote boot feature works pretty well and can be
used to generate boot disks on a machine that has none. The Apple ][ can
boot from a serial port as well so this is a neat feature to have. In
addition, the optional ROM is helpful for booting systems or adding specific
capability.
I'd like to keep the design as general as possible just like the GIDE since
then it can be used on a variety of systems. I am thinking of calling it
the ZIDE to distinguish it from the GIDE since there are some important
differences.
I am still thinking this over and may do this project. However there are a
lot of other important projects underway at N8VEM like the S-100 80386 CPU
board, S-100 VGA, and the MC68040 SBC that are taking precedence right now.
I am thinking though that the ZIDE would be a fairly small project though.
It is pretty simple and just a conversion of the already well proven XT-IDE
V2 design.
Thanks and have a nice day!
Andrew Lynch