Re: Re(2): ][C+ $200

[nathan@cco.caltech.edu (Nathan Mates)]

In article <15614.2529389@adbbs.adbbs.antioch.edu>,
John L. Graham <John_L._Graham@adbbs.antioch.edu> wrote:
>65c802? What's that (looking dumb).

   Quick technology lesson: 65802 is a 65816 in the same package (size,
pinouts, everything) as a 6502/65C02. The advantage of it is that you
can do 16-bit operations, etc. The disadvantage is that you have to use
the host's machine kludges to access more than 64K of memory; the 65802
can't directly address the extra memory.

> The IIc+ uses the 65c02 and one thing you
>have to be careful of is the accellerator is built into the mother board akin
>to the Speed Demon card, which is why you can drop an 8MHz Zip into one.
>Soooo, I'd be careful about swaping out the micro processor. However, if the
>chip is cheap and doesn't blow the motherboard, what ta heck! Give it a shot.

   If the switch on the //c+ just changes whether the chip runs at 1 o
4 Mhz, dropping in a 4+Mhz 65802 should work, as you can underclock a
chip without too much problem. But, if it's something like the ZipChip,
where there's support circuitry on the microprocessor, things can get
very bad.

Nathan Mates



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