[Coco] 50 pin SCSI adapters?

[Mike Pepe]

It'll likely work, I've used these things on old Sun-3 machines which use 8-bit SCSI. You can mix wide and narrow SCSI on the same bus as long as you terminate it properly, and in this case the upper portion of the bus is simply completely unused and ignored. A physical HD68 to 50-pin adapter would work fine.

> -----Original Message-----
> From: coco-bounces at maltedmedia.com [mailto:coco-
> bounces at maltedmedia.com] On Behalf Of Tony Cappellini
> Sent: Wednesday, January 18, 2012 9:22 PM
> To: coco at maltedmedia.com
> Cc: amune at doki-doki.net
> Subject: Re: [Coco] 50 pin SCSI adapters?
> 
> Date: Thu, 19 Jan 2012 03:55:21 +0000
> From: Mike Pepe <lamune at doki-doki.net>
> Subject: Re: [Coco] 50 pin SCSI adapters?
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Message-ID:
> 
> <9A1A4185BE833D4AB31ADF4066AE4B2DE5641E3D at CONCORD.lamunet.loca
> l>
> Content-Type: text/plain; charset="us-ascii"
> 
> >>Keep an eye out for ACARD AEC-7720UW IDE / SCSI adapters or bridges.
> >>They
> sometimes appear on ebay >>for reasonable prices. Never used on a CoCo
> but they worked fine on the SCSI RAID cards I was using years >>ago.
> 
> Just looking at the part number you posted:  AEC-7720UW gives me the
> feeling this is not compatible with 50-pin SCSI devices. The UW to me implies
> Ultra Wide, which means 80MB/s, 16 bit data transfers.
> 50 Pin SCSI is only capable of 8-bit data transfers, and much less than 80 MB/s.
> It's been too many years since I've worked with the SCSI protocol, I can't
> remember the max transfer rate for 8-bit SCSI, but I'd guess around
> 30 MB/s.
> 
> An Adaptec 1540 is definitely an 8/Bit SCSI card, but finding one may be touch.
> Try Ebay or Weird stuff.
> 
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