[Coco] disk controller chip

[Darren A]

On Sun, May 4, 2014 at 11:55 PM, Arthur Flexser wrote:

> I'm somewhat certain, though not positive, that all Tandy controllers
> except for the very first one had the 1773 chip.
>


The first controller (26-3022) requires a 12V supply and uses a WD1793
chip. The second generation (26-3029) comes in two flavors, with the
earlier ones having an MB8877 and the later ones having a WD1773. The
FD-500, FD-501 and FD-502 all use the WD1773. In the FD-502 the chip is not
socketed making it much more of a pain to replace.

Darren