C64/C128 program identifier?

[MIRKOSOFT]

Hi!

I have simple but maybe too stupid Q:

Is possible to identify that program is written for C64 or to C128? (maybe Plus/4 or VIC20)
Has program file any identifier?

Yes, it's stupid Q, but somebody maybe knows about more, or it is not possible, but better is to ask...

Thanks for every reply!

Miro

[commodorejohn]

There's not really a good way to find out, short of checking the documentation or trying it on a C64 and seeing if it works, although a lot of 128 programs have either "128" or "80" in the title somewhere.

[Hydrophilic]

One good way is to check the file load address.  Many disk programs offer this function.  A stand-alone version is available on the test/demo diskette that comes with most Commodore disk drives.

If the program is BASIC, then it will usually be like this:

Start Address	Computer
$0401	PET
$1001	VIC (unexpanded)
$1201	VIC
$0801	C64
$1001	Plus/4
$1C01	C128
$4001	C128 (using GRAPHICs)

Very rarely, a BASIC program might have a different address than listed above.

For machine language programs, it is harder to tell.  C64 utility programs often load to the area $C000~$CFFF.  C128 utility programs often load to the area $1300~$1BFF or $0B00~$0FFF.

Full blown ML programs (not tiny utitlities) could load just about anywhere, but usually low in memory like BASIC.