Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!caen!zug.csmil.umich.edu!chymes
From: chymes@zug.csmil.umich.edu (Charles Hymes)
Newsgroups: comp.sys.amiga.hardware
Subject: Can I replace a MC74F139 IC with a 74LS139 IC??
Message-ID: <1991Mar10.185521.14238@engin.umich.edu>
Date: 10 Mar 91 18:55:21 GMT
References: <1991Mar10.184945.14146@engin.umich.edu>
Sender: news@engin.umich.edu (CAEN Netnews)
Organization: Cognitive Science Machine Intelligence Laboratory, U of M.
Lines: 11

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The PD I/O expantion board I just built dosent work, and the current
thing to try is to replace the chips. The board uses a R65C22p1 CMOS
VIA a R65c52p1 CMOS DCIA and a MC4F139 IC.
Ive gotton ahold of a number of 74LS139 chips, and I'm going to replace
the MC74F139 with it. The difference being LS vs F.  I think LS means
low power Shottsky, but what does F mean, and can I interchange the
chips? Does this make them incompatable?

Thanks for the info,
Charles