30 May
2000
30 May
'00
11:57 a.m.
The 'Shack model 1's had a 1771 and the model 3's had a 1793. These were
nearly pin-compatible, both on a 40-pin footprint and required buffering to
drive the cable. The 1770,1772, and 1773 are 28-pin parts that can drive
the cable directly.
Dick
----- Original Message -----
From: allisonp <allisonp(a)world.std.com>
To: <classiccmp(a)classiccmp.org>
Sent: Tuesday, May 30, 2000 4:19 PM
Subject: Re: Defining Disk Image Dump Standard
on.
>Just as an
aside, I recently encountered a datasheet for the WD 1773 FDC
>(similar to 1770/72). Do you know of any systems in which it was used?
the 1770/1772 was the 1793+8229+glue on one chip.
Wasn't the 1773 a single-chip version of the
1793, or am I out in Left
The 1773 was the earlier single density controller.
The 1793 was the later DD and SD controller in nearly the same pinout
and basic IO.
Field? The early Tandy controllers that required
12V were based on the
1793, and weren't the later 5Vonly ones based on the 1773?
No. The tandy used the 1773 and was wired to provice the -5V and +12V
as needed but there were parts that didn't use the -5V (SMC 1773).
The 1793 wanted +12 and +5 though there were 5volty only versions later
Allison