SASI interface, SCSI devices...

From: Jules Richardson <julesrichardsonuk_at_yahoo.co.uk>
Date: Thu Feb 10 06:34:05 2005

On Thu, 2005-02-10 at 01:43 -0500, Ethan Dicks wrote:
> So... I've always envisioned replacing the SASI bridge card and the
> TM60[23]S with a modernish SCSI disk... there is a 16MB internal limit
> on filesystem size (255 tracks of 255 sectors of 256 bytes), so pretty
> much anything would do, as long as it could be talked to by a 1MHz
> 6502 with a non-controller-chip-type 50-pin port. I hadn't thought
> about particular timing differences with any of the signals, nor had I
> thought about parity. Thanks for mentioning those as potential
> pitfalls.

FWIW, smaller capacity drives ( <= 1GB) generally have a jumper to
enable or disable parity - presumably it disappeared on larger drives as
parity became a standard feature.

Timing's an interesting one. Certainly the upper limits for timing are
contained in the SCSI-1 spec, but I've never been able to find a SASI
spec to see what that says.

Curiously, the 1GB Fuji (M2694ESA) drive that I dumped into my Tek
workstation has a jumper on it to change between SCSI-1/CCS mode and
SCSI-2. I don't recall seeing that on any other drive though.

cheers

Jules
Received on Thu Feb 10 2005 - 06:34:05 GMT