Defining Disk Image Dump Standard

From: allisonp <allisonp_at_world.std.com>
Date: Tue May 30 17:19:10 2000

>>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 - 17:19:10 BST