Path: utzoo!mnetor!uunet!seismo!sundc!pitstop!sun!decwrl!ucbvax!pasteur!ames!husc6!rutgers!aramis.rutgers.edu!porthos.rutgers.edu!friedman From: friedman@porthos.rutgers.edu (Gadi ) Newsgroups: comp.sys.apple Subject: Re: 2 MHz 65C02 Message-ID: Date: 16 Apr 88 20:56:56 GMT References: <8804152211.aa11958@SMOKE.BRL.ARPA> Organization: Rutgers Univ., New Brunswick, N.J. Lines: 34 To: PGOETZ@LOYVAX.BITNET In article <8804152211.aa11958@SMOKE.BRL.ARPA> PGOETZ@LOYVAX.BITNET writes: > Does anyone have experience with using a 2 MHz 65C02? Can you just > drop it in & run the computer? I am certain that it would not initialize nor > write to disks correctly, but suspect that it could read from disks. Is this > correct? > > Phil Goetz > PGOETZ@LOYVAX You are correct. dropping a 2mhz 65c02 into an Apple IIE/C will work great. It will even initialize and write disks correctly. This is because your Apple already has a 2mhz 65c02 in it. The clock speed is set it run at 1MHZ so these chips provide more reliable performance at lower temps. Notice that you will not get any change in speed by replacing your chip. The only way to speed up the computer is by changing the system clock speed. (I suspect the ZIP chip has its own internal clock). However, just replacing the Xtal with one having a higher speed will not work, since most of the Apple components can not handle the higher clock rate. You will also have trouble with the Apple video, which must access the memory each clock cycle. Gadi. PS. The "speed" of a chip just tells you what its maximum rated speed is. The manufacturer guarantees that the chip will work correctly at the rated speed. The system designer, however, can run the chip at whatever speed they like, though if they run in at too high a speed the chip will not work. -- uucp: {ames, cbosgd, harvard, moss}!rutgers!aramis.rutgers.edu!friedman arpa: FRIEDMAN@ARAMIS.RUTGERS.EDU