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_at_world.std.com>
To: <classiccmp_at_classiccmp.org>
Sent: Tuesday, May 30, 2000 4:19 PM
Subject: Re: Defining Disk Image Dump Standard
> >>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
on.
>
> Allison
>
Received on Tue May 30 2000 - 18:57:50 BST