17 Apr
2000
17 Apr
'00
5:58 p.m.
I know someone has made an ide hard card for the 8 bit apple 2 bus that takes
modern IDE drives, including the 1 inch notebook drives. I'm unclear how it
was done, but you can buy one at www.allelec.com/harddiap.htm .
Well, I've got one drive, an ST351, I think it is, that responds to the
8-bit conditioning. It's a 1.25"-tall 3-1/2" drive, of 44 MB capacity.
That's not what I want for the "hard-card" on the S-100.
All your assertions about the relative folly of expending effort/resources
to make the drive talk-8-bits wide has no real purpose except to bind it to
its historical roots. I'd bet that the logic in the 1003-WAH uses the
data-width bit to enable the IOCS16- signal and thereby lets the AT bus
control whether the transfer is 8 or 16 bits wide, since the AT bus is
required to do that.
The early IDE drives made for COMPAQ by Seagate, were half-high 5-1/4"
drives from which I've saved one or two of the PCB's. These have all the
same logic on them that I recognize from the 1003-WA2 which is a WAH with
the FDC missing, I think. Maybe it's the other way around . . .
Those guys undoubtedly supported the 8-bit mode, since their host was, in
some cases, an XT-class machine.
Dick
----- Original Message -----
From: allisonp <allisonp(a)world.std.com>
To: <classiccmp(a)classiccmp.org>
Sent: Monday, April 17, 2000 8:22 PM
Subject: Re: 8-bit IDE
busses.
replace
--
Jim Strickland
jim(a)DIESPAMMERSCUMcalico.litterbox.com
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> "Has anyone got sufficient
experience with the IDE in
non-PC-compatible
applications to say, unequivocally, whether the 8-bit operating mode
described in section 6 of the standard for the ATA (IDE) interface, yes
SPELLED OUT, actually exists in drives of the pre-1996 vintage?" It was
dropped from the standard in 1996. There seem to be many folks with
suggestions about how to implement this extremely elementary interface.
There seem to be few who know whether the standard was every full
implemented.
Why would they include that? NONE of the PC hardware they were intended
for wants to run as 8bit bus. Even the crippled SL/SLC run as 16bit Allison seems to be the only one who's tried
this, and, I fear, it may be
in
a PC-compatible, where all bets are off as to what
really happens.
Obviously visually impaired! I don't hack IO in PCs nor have I tried that
yet.
I may add why even bother, IDE works there as is.
ALL of the IDE work I've done was with 8085, z80s either stand alone
(bus less) or S100 Z80s. Further I'm currently working on a Z280 system
with IDE (Zbus 16bit). This is where I need interfaces and so I can older MFM or non-existent hard disks. I
currently have one S100 system
running a connor3044A (40mb) IDE that will be upgraded to a ST3250
(250mb) as it's a better drive.
The drives I've tried include:
Connor 2022
Connor 3044
WD2120
WD2420
St3096A
St3144A
St3250A
St3660
Fijitsu 528mb
Quantum LPS 80 and 120
Maxtor 124mb
and afew other sub 60mb WD, NEC, Seagate drives.
I now have two 2.5mb IDE in the 700-800mb region I may try one day.
I do have two WD PS/2m30 compatable 8bit IDE 20meg drives.
I think this is a good cross section
Allison
>
>Dick
>
>----- Original Message -----
>From: Mike Ford <mikeford(a)socal.rr.com>
>To: <classiccmp(a)classiccmp.org>
>Sent: Monday, April 17, 2000 7:22 PM
>Subject: Re: 8-bit IDE
>
>
>> I don't know a hoot about this, but I wonder if taking a look at the
>> Sequential Systems Focus card for the Apple II might be instuctive. Its
a
>> controller and notebook IDE drive that
all fits on a Apple II slot
card.