Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!zaphod.mps.ohio-state.edu!casbah.acns.nwu.edu!squishy
From: squishy@casbah.acns.nwu.edu (Shishin Yamada)
Newsgroups: comp.sys.atari.8bit
Subject: Re: 65C02?
Keywords: 6502, 65C02, 6502C
Message-ID: <1991Mar7.200615.24433@casbah.acns.nwu.edu>
Date: 7 Mar 91 20:06:15 GMT
References: <1991Mar5.110713.24023@cs.city.ac.uk> <16595@chopin.udel.edu>
Organization: Northwestern University
Lines: 32


	Ooops, sorry, I guess I'm wrong. The 65C02 must have TTL line
drivers installed. I dunno if it would make the computer faster however,
since it is still clocked at the same clock speed, and the peripheral
interfaces are still the same type (I think the XE series has upgraded
PIAs). But, I would like to hear from those that modifed it. The key
advantage to CMOS technology is that it requires very little power, but its
drawbacks are speed and also driving devices. CMOS requires little power
because in CMOS technology power is consumed only when switching between
logical states (0-1 or 1-0 transitions). Very little power is used in the
steady-state logic outputs. This can possibly be a problem, especially if
there are pull-up or pull-down resistors somewhere, since it may not keep
the correct logic values (Should not be a problem if line-driver is
installed though).

	If you decide to modify it, you MUST be careful to observe CMOS
static handling procedures, as a static shock could fry the chip's oxide
layers. Basically this means the best protection is to only handle the chip
with something like a static wrist strap (available cheap from Radio Shack)
to ground your body. I'd like to hear how it comes out!

 
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Shishin "Squish" Yamada                    |\/\/\/|
 squishy@casbah.acns.nwu.edu  /---------\  |      |
 Northwestern University      | Yo      |  (o)(o) |
 Electrical Engineering       |  Dudes! \  ( <    )
 Class of 1991                \__________\ |___/  |
                                             \    |
  "Life sucks, but Death swallows!"          /    \
                                            /______\
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