On 10/02/2017 09:04 AM, allison via cctech wrote:
On 10/2/17 9:40 AM, william degnan wrote:
ATA-IDE and SCSI (OK SASI) are about the same age but
had
different adoption and growth rates.
Earliest SASI/SCSI was AmproLB+ and Visual 1050 with
adaptor. I
have both with hard disks.
FYI the Z80 powered AMPROLB+ was 1984 introduction.
The Commodore D9060/D9090 pre-dates these and was a SASI
derivative, right? Not that it matters which was first,
but just wanted to mention the CBM hard drive too. I have
worked with the Visual and CBM drives, but never seen the
AMPRO.
Hi Bill,
I used those as I knew the dates well having them since new.
Ampro was a basic 64K Z80 system with mini (5.25) or
micro(3.5) inch floppy interface and if purchased the 5380
parallel/SCSI/SASI adaptor chip. With it you could use
the varios boards (Adaptec or Xybec) and the Shugart 20mb
SASI drive with the existing software supplied. I modded
the BIOS to adapt it for a Fujitsu 45mb 3.5" SCSI drive a
few years later. and it would work with most current
generation SCSI-1 drives save for partitioning and
initializing.
The visual was actually older and used TTL to create SASI
(scsi look alike) bus and the same adaptors
and drives to complete the hard disk side like the Ampro.
I still feel the SCSI bus was inspired by IEE488 (GPIB).
Nope, inspired by IBM selector channel bus. This was stated
in an early SASI or SCSI document, and the
names of the signals are pretty close to the signal names on
the tag cable for a selector channel.
I bought a Memorex 10 MB drive and SASI adaptor on an
introductory deal in a magazine. This was in about
1980-1982. I had it on my Z-80 CP/M system.
Jon
