[Coco] 6821 and 6551 compatible parts @ 14Mhz Bus Speed

[coco at yourdvd.net]

Yes, the 6521 PIA is pin compatible with the 6821, their 6545 is pin
compatible with the 6845, etc. Rockwell originally made the 65xx
series, but I suppose WDC (not the one that makes hard drives, but
Western Design Center) has kept them alive and IMPROVED. -robert

> -------- Original Message --------
> Subject: Re: [Coco] 6821 and 6551 compatible parts @ 14Mhz Bus Speed
> From: Joel Ewy <jcewy at swbell.net>
> Date: Sun, April 29, 2007 9:12 am
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> 
> coco at yourdvd.net wrote:
> > I was browsing around the Western Design Center (for those who don't
> > remember, they created the 65C816 16-bit version of the 6502, which is
> > what made the Apple IIgs possible). They still manufacture components,
> > and so I thought perhaps their 6521 PIA would come in handy as CoCo
> > replacement parts and their 6551 for upgrading my RS-232 Program Pak
> > and Modem Pak to 2-mhz operation. I was surprised to find that their
> > version of these parts are rated at 14Mhz, which makes since, as the
> > 65C816 is a 14Mhz part. Their prices are reasonable for brand-new
> > parts. Have a look:
> > http://www.65c816.com
> >   
> Looks as if they're even pin-compatible.  Nice!  Even makes me wonder
> what I could do with some of the spare 68000 chips I have lying around...
> > Now that's cool :-) Wish I had a 14Mhz CoCo :-(    -robert
> >   
> FPGA -- it can be done.  FPGA -- it can be done.  FPGA -- it can be
> done.  FPGA -- it can be done...
> > (have these lil' ASCII faces become an annoyance yet - I seem to be
> > using them a lot.....)
> >
> >   
> About to drive me berzerk!  ;-)
> 
> JCE
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> >
> >   
> 
> 
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