The origin of the phrases ATA and IDE [WAS:RE: formatting MFM drives on a IBM PC]
allisonportable at gmail.com
Mon Oct 2 09:22:10 CDT 2017
On 10/2/17 10:13 AM, Jules Richardson via cctech wrote:
> On 10/02/2017 08:29 AM, allison via cctech wrote:
>> On 10/2/17 8:22 AM, Jules Richardson via cctech wrote:
>>> On 10/02/2017 01:46 AM, Alan Perry via cctech wrote:
>>>> There was a call to form the CAM (Common Access Method) Committee
>>>> of X3T9.2
>>>> (SCSI-2) on 30 Sept 1988 and they first met on 19 Oct 1988. The
>>>> goal was to come up with a SCSI subset to facilitate it support in
>>>> OSs and BIOS on PCs. At the first meeting, two items mentioned in the
>>>> minutes seem relevant. 1. Jim McGrath of Quantum was interested in
>>>> embedding SCSI in the drive without a physical SCSI bus and described
>>>> problems with reference to the PC/AT.
>> So in effect the IDE was a minimal interface that would interface to the
>> computer bus
>> with no more than buffering.
> True, I suppose the command structure was more complex with SCSI. It's
> a shame though, it would have been nice if SCSI had been the PC
> standard, what with the large number of devices available, more
> flexibility, and performance potential.
It was/is widely used in PCs. It put Adaptec on the map. Servers and
high end systems
commonly used it especially for early shadow and RAID systems.
>> Early SCSI disks
>> were MFM drives with Adaptec or Xybec host boards (SCSI to MFM, local
>> was Z80 on the adaptor).
> Xebec... but yeah, and I forgot that they used a Z80 (I was thinking
> it was some Intel 80xx thing).
Later versions of bridge boards had the 8088 or 80188 16bitter.
> I don't know if Xebec actually made a SCSI one, I think they may all
> have been SASI (at least the ones that I've used). I remember there
> was a little schematic in the back of the manual for a suitable
Some were SASI and later firmware was SCSI... Only difference as I had
> Adaptec, Emulex and OMTI all made similar bridge boards... and there
> were probably others, too.
Yes, them too.
Oddly the first VAX to use SCSI or SCSI like was uVAX-2000 as the extra
box with TK50 Tape
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