[Coco] disk controller chip

[Gene Heskett]

On Tuesday 06 May 2014 11:37:35 Gene Heskett did opine:

> 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
phat fingers as usual, should have been the 1793.


Cheers, Gene
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>
US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS