Re: 65xx availablility

On Fri, 9 Jan 1998 17:06:14 -0800 (PST), aek (Al Kossow) wrote:

>"65c02 4.95
>6522 3.25
>6551 2.95
>"
>
>Apple used 6522's and 6551's as well..
>The hard part (for me :-) to find is 6532's..
>Like I said in my posting earlier, you could
>probably use the 6522 and an external ram
>just as well.
>
>Does anyone know off hand if there was a
>programming difference between the 6502 and
>65C02? I've tried substituting C02's for
>02's in some games, and have had problems
>getting them to work..

I don't know off hand what it was, but there WAS some differences in programming
between the 6502 and the 65C02, enough to mess up some programs.

Commodore might not exist, but for embedded systems the 6502 is still going
strong. I have a Franklin spell checking calculator that I was given 3 years
ago and it based on the 6502 processor. I believe there current models still
are. I was told by an engineer out here that current owners of the 6502 design
(western digital I believe) have a VHLD model of the processor that runs at 100+
mhz.

Even though the processor is still very much in use, I'm not so sure of the
support chips (6551). As a side note, the 6551 really sucked! It's hardware
handshaking was implemented with an AND gate. Whenever it's CTS line went
false, it stopped transmitting instantly, right in the middle of the character
that was currently being sent! Pretty worthless design as far as hardware
handshaking goes.

-Zonn

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Received on Fri Jan 9 17:43:00 1998