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Posted By

JamesC
on 2015-08-08
02:13:55
 Re: Making a cartridge...

16K. The slot that held the ROM maps in at $8000, the other slot maps in at $C000.

Cartridge ROM must follow this sequence to be recognized:
$8000-8002 4C xx xx (where xx xx is the cold start address within your ROM)
$8003-8005 4C xx xx (duplicate the previous line; this is intended for warm start but hardly anyone uses it)
$8006 Unique cartridge number (please select a value $10-$FF if you want it to appear on a function key, or 01 = autostart)
$8007-800a the ASCII characters 'C B M'

You can look at any CRT on Plus/4 World with a hex editor to see how other programmers do it, but basically if you follow this setup the Plus/4 or C16 will know what to do with your cartridge. happy



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