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From: ranger@ecsvax.UUCP
Newsgroups: comp.sys.apple
Subject: Re: 65802
Message-ID: <3014@ecsvax.UUCP>
Date: Tue, 28-Apr-87 10:31:04 EDT
Article-I.D.: ecsvax.3014
Posted: Tue Apr 28 10:31:04 1987
Date-Received: Wed, 29-Apr-87 06:14:38 EDT
References: <8704261908.aa15443@SPARK.BRL.ARPA>
Organization: UNC Educational Computing Service
Lines: 26
Summary: Yes, but...

In article <8704261908.aa15443@SPARK.BRL.ARPA>, LYMAN@IASSNS.BITNET writes:
> A friend of mine received a free copy of a book on programming the 68516, as
> well as the 65802, 65C02 and of course the 6502.  I find that miraculously,
> the 65802 is pin compatible with the 6502, therefore, if I understand the
> book, can be plugged right in where the 6502 used to be (in my 64K II+).
> 
> My questions are 1) is this indeed possible? and 2) what does this buy me?
> Am I then left to program in machine code? assembler (whose?) or is there
> any software out there which would use the new chips 16 bit capabilities.
> I do a lot of work with floating point arithmetic, so any speedup would be
> appreciated.
> 
> Lyman Hurd

You can put the 65802 in the //+, but some poeple have had problems because
of a timing bug in the //+.  It seems to vary with the production date of
the machine.  I believe the folks at S-C Software in Texas came up with a
fix for the problem.  They publish Apple Assembly line.  You can call them
for help on this subject.  I don't have their number but I think they are in 
Dallas.  The 65802 is basically a 65816 without the top 8 address lines con-
nected.  You can get more efficiency out of the chip but you'll have to
write it yourself.  Its too bad that Apple didn't put them in the //c
and in the //e enhancement kit, but I guess production wasn't up to the
point where Apple could get the millions they needed.

Rick Fincher