Re: Detect a C128 from C64 mode

From: Jason Robertson (
Date: 2003-02-14 02:26:23

On Thu, 13 Feb 2003 23:52:29 +0100, Ullrich von Bassewitz
<> wrote:

>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. What I've used until

I found this in Article 85 in Cameron's Knowledge Base:

C128 running in C64 emulation mode?

If the program is in a C128 that is running in C64 mode you can take
advantage of the numeric keypad and FAST (2 mhz) processor modes even
though your program is a C64 only one. To tell this you can take
advantage of the fact that the VIC II chip in the C128 has 2 more
registers than the one in the C64. The location 53296 ($d030) will
contain 255 ($ff) in a C64 but will contain 252 ($fc) in a C128 that
is running in C64 mode.

Hope this is helpfull...


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