jsmcginn@uok.UUCP (10/10/84)
I recently heard that the 65C02 was pin compatible with the 6502, and that anyone with an Apple II,II+,or IIe can simply remove the 6502 from their machine and replace it with the 65C02 and be able to use the new commands and addressing modes. Has anyone ever tried this? Will it work? j
ag4@pucc-h (Uncle Jeffer) (10/17/84)
> I recently heard that the 65C02 was pin compatible with the 6502, and > that anyone with an Apple II,II+,or IIe can simply remove the 6502 from their > machine and replace it with the 65C02 and be able to use the new commands and > addressing modes. Has anyone ever tried this? Will it work? According to Apple, you can do this upgrade to a //e, but the chip has to be a specific one (I think NC65C02). They indicate, however, that availability could be a problem. I'm not sure whether it'll work for a II+ or lower. I can get specific information this weekend and will post again next week if someone else hasn't come up with the info. -- Jeff Lewis vvvvvvvvvvvv {decvax|ucbvax|allegra|seismo|harpo|teklabs|ihnp4}!pur-ee!lewie
gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>) (10/20/84)
> I recently heard that the 65C02 was pin compatible with the 6502, and > that anyone with an Apple II,II+,or IIe can simply remove the 6502 from their > machine and replace it with the 65C02 and be able to use the new commands and > addressing modes. Has anyone ever tried this? Will it work? Except for some really gross dependencies on misfeatures of the old 6502, existing code should work just fine using the 65C02. I did this switch on my Apple //e a long time ago and have had no problems with it. However, unless you are going to use the new instructions there is very little reason to switch. If you DO use the new instructions then your code will not port to any machine except the Apple //c.
preuss@umcp-cs.UUCP (Don Preuss) (10/23/84)
[] Code-wise, most stuff should work with the CMOS processor. However, you will not be able to install this in a II+. The reason is that the CMOS unit is clocked for 4 meg, and the slowest available version still runs at 2 meg. Apple themselves had to modify the bus timing on the IIe to handle the 6502A, because the data windows were already gone by the time the bus tried to accept valid data (hence, the inability to run very time-picky Spiro-disk protected software). As far as I know, there is no version of the II+ (or the 65C02) which is compatible. -Dave Hsu Bitnet: DAVIDHSU @ UMDA ---- end forwarded message -- Uucp: ...!harpo!seismo!umcp-cs!preuss CsNet: preuss.umcp-cs@csnet-relay 301-496-2265