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Re: SCSI cards and the II+
- Subject: Re: SCSI cards and the II+
- From: mjmahon@aol.com (Michael J. Mahon)
- Date: 03 Jul 2002 03:40:50 GMT
- Newsgroups: comp.sys.apple2
- Organization: AOL http://www.aol.com
- References: <k4oU8.2586$0c1.316225@news1.west.cox.net>
- Xref: archiver1.google.com comp.sys.apple2:20948
Scott Alfter wrote:
>I thought I read somewhere that the 65C02 wouldn't work in a II+, or that it
>was flaky. The II+ was built mostly of 74LSxxx chips, which aren't
>compatible with CMOS parts. Replacing the chips that talk directly to the
>processor with appropriate 74HCTxxx parts might do the trick, but I've not
>looked into it (you'd need to figure out which chips to replace first...or
>maybe you'd just replace all of 'em).
The 65C02, though implemented internally as CMOS, is designed
to be completely TTL compatible. There is always the possibility
of some marginal setup and hold time issues, but the logic levels
and drives should be fine.
-michael
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