[Coco] disk controller chip

[Gene Heskett]

On Tuesday 06 May 2014 11:23:39 Frank Swygert did opine:

> Date: Mon, 5 May 2014 09:19:47 -0600
> From: Darren A<mechacoco at gmail.com>
> 
> 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.
> 
> ==========================
> 
> Note that the MB8877 and WD1773 are pin compatible -- they can be
> swapped. The MB8877 is a "work alike" of the WD1773 made by another
> company, I assume under license but could have been reverse engineered.

I have often wondered if it would run faster, like the 1893 could. I'd like 
to play with my sc-ii and find out, but I only have one of them.

Cheers, Gene
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