Re: Proterm and the //E

[nparker@cie-2.uoregon.edu (Neil Parker)]

In article <4r56je$fpm@wraith.cs.uow.edu.au> david@wraith.cs.uow.edu.au
(David E A Wilson) writes:
>nparker@cie-2.uoregon.edu (Neil Parker) writes:
>>     IF  PEEK (64435) = 6 AND  PEEK (64448) <  > 234 THEN  PRINT "Mousetext
>>     is probably available."
>
>>The above line is also sufficient to distinguish if the CPU is a 65C02 (or
>>better), since all ROMs that pass that test make use of 65C02 opcodes.
>
>This is incorrect. The enhanced //e ROMs, despite coming with the 65c02 chip,
>do not use any non 6502 instructions. I have run a //e with a 6502 and enhanced
>ROMS without problems (other than software which requires 65c02 instructions).
>It is a fairly safe bet however.

Ack.  I was afraid of that.  The possibility did occur to me, but not until
several hours after I posted.

I guess the lesson here is don't rely on the ROM version to tell you
whether or not a 65C02 is available.  Do one of the guaranteed-foolproof
checks instead, such as testing for the 6502 decimal mode bug.

              - Neil Parker
-- 
Neil Parker, nparker@{cie-2,cie}.uoregon.edu, http://cie-2.uoregon.edu/~nparker

                     "Bad move, Neil!"  -- The Tick