Re: Detect a C128 from C64 mode

From: Rainer Buchty (
Date: 2003-02-14 01:51:45

> I'm currently wondering if there is a really easy and reliable way for a
> C64 program to detect if it is running on a C128 in C64 mode.

Maybe the CIA real-time clock could help: It only relys on the 50/60Hz
pulses derived from 9VAC. So if you read the TOD clock, switch to 2MHz,
run a small idle loop, read the TOD clock again, switch back to 1MHz and
compare the values, you should be able to tell a true C64 from a
C128 in C64 mode system.



Dr. Rainer Buchty, LRR, Technical University of Munich @ Garching
Phone: +49 (89) 289-18477, Fax +49 (89) 289-17662, Room 01.06.061

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