CP/M-80 drivers for WD33C93 ???

From: Ethan Dicks <ethan_dicks_at_yahoo.com>
Date: Sat Nov 27 16:39:12 1999

--- Allison J Parent <allisonp_at_world.std.com> wrote:
> I've heard the 33C93 is a really buggy chip.

Early versions have their (well documented) problems. Commodode elected to
use the WD33C93 with the autobooting SCSI cards - A2091 and up including
the A500 slap-on A590 (either SCSI _or_ XT-IDE drives would work on it owing
to Commodore's custom controller chip between the Amiga and the 33C93) and
on the motherboard of the Amiga 3000.

The wisdom in the Amiga arena is that even though C= shipped rev 02 and
rev 04 chips, you need the last version ever produced (rev 08?) to take
advantage of proper disconnect/reconnect operations and to have a full
7-device chain. The older chips work OK if you have one or two disk
devices, but have problems with four or five disks, a CD-ROM and a tape

There is example code for the WD33C93, not for CP/M, but for (Net|Free)BSD
on the Amiga.

Also, if anyone is looking for a few rev 02 chips, I have a tube of them
that I'm keeping as Amiga spares. I could let a couple go, depending on
how much over shipping I'm offered.

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Received on Sat Nov 27 1999 - 16:39:12 GMT

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