[sebhc] H67-SCSI interface

[West, Ronald S.]

Barry,

I may have been stating the merely obvious, or even the incredibly obvious
but not everyone on this email group is an ex Heath (or whatever) engineer.
I was hoping that putting the details on here would spur others to grab an
old SCSI drive and see if they could get it working, and let the group know
what they found.

Ron


> -----Original Message-----
> From: sebhc-bounces at sebhc.org
> [mailto:sebhc-bounces at sebhc.org] On Behalf Of Barry Watzman
> Sent: Tuesday, July 12, 2005 4:29 PM
> To: sebhc at sebhc.org
> Subject: RE: [sebhc] H67-SCSI interface
> 
> 
> This should be no surprise.  The data connector in the 67
> ***IS*** "SASI" except that 10 unused pins were left out to 
> get a smaller, narrower connector and cable.
> 
> 
> -----Original Message-----
> From: sebhc-bounces at sebhc.org
> [mailto:sebhc-bounces at sebhc.org] On Behalf Of West, Ronald S.
> Sent: Tuesday, July 12, 2005 3:38 PM
> To: 'sebhc at sebhc.org'
> Subject: [sebhc] H67-SCSI interface
> 
> From discussions about the H67 interface the other day I
> decided to compare it with a standard 50pin SCSI interface. 
> They appear to be nearly the same except for the pinouts of 
> the connectors. The data pins are the same on both, starting 
> on pin 2 with -DATA0 and going through pin 16 (even pins) 
> with -DATA7. Pin 18 is Parity. The other signals are all 
> offset by 10 pins. See table below for all connections.
> 
> * All Odd pins are grounded.
> Signal    H67     SCSI
> ----------------------
> -DATA0     2       2
> -DATA1     4       4
> -DATA2     6       6
> -DATA3     8       8
> -DATA4    10      10
> -DATA5    12      12
> -DATA6    14      14
> -DATA7    16      16
> -PARITY   18      18
> -Busy     26      36
> -ACK      28      38
> -RST      30      40
> -MSG      32      42
> -SEL      34      44
> -C/D      36      46
> -REQ      38      48
> -I/O      40      50
> 
> If we are lucky and the modern SCSI commands are a superset
> of the old SASI commands this might work. I ordered a couple 
> connectors (couldn't find a 40pin and 50pin connector in my 
> parts bin) which should be in later this week and will make 
> an adapter to allow a 50pin SCSI drive to be hooked up to the 
> 40pin H67 interface connector. A friend of mine has a 4.3G 
> SCSI drive he is going to give me for my "experiment". Will 
> let you all know if there is any success.
> 
> Ron
> --
> Delivered by the SEBHC Mailing List
> 
> --
> Delivered by the SEBHC Mailing List
> 
--
Delivered by the SEBHC Mailing List