[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: 6503?

On Sat, 9 Sep 2000 02:30:04 -0300, Tony Cianfaglione
<ab616@chebucto.ns.ca> wrote:

>
>I picked up a IIc ROM version 3 from a thrift store and opened it up to
>look at the board and chips.  Instead of the 65c02a like my other IIc,
>this one had a 6503.
>
>H-uh?  What is this chip?  An improvement or just a replacement?
>
==========================================================
Are you sure you know what you picked up?  The 6503 is a 28-pin CPU
with a 4k address range.  (12 address bits).  It's not a ROM, and it's
not an enhanced 6502.  It's a baby brother to the 6502, quite suitable
for microcontroller applications, but not much else.  If it's plugged
into the 6502 socket, it should leave quite a few pins open for one
purpose or another, and the entire IIc doesn't work.

Dick