12-06-2013, 09:43 AM
Just to help me understand the structure of the language a bit better I'd like to know what the method would be for adding commands. I'm mainly interested in adding the following commands from SE Basic IV:
CLUT: select color look-up table (0 to 3)
COLOR: absolute attribute value (0 to 255)
PALETTE: set ULAplus registers
RESET: restore palette from palette buffer (first 64 bytes after screen)
PUT: wrapper for LDIR
SCROLL: text display scrolling
SOUND: set AY registers
SPEED: set CPU speed for clones
But I can also provide support for the one everyone is always asking for:
PLAY
All of this can be done without requiring either the SE Basic ROM or the 128 ROM. Having said that PLAY isn't very versatile, can't be interrupt driven, and has a fairly large RAM overhead (the routine takes 2296 bytes).
CLUT: select color look-up table (0 to 3)
COLOR: absolute attribute value (0 to 255)
PALETTE: set ULAplus registers
RESET: restore palette from palette buffer (first 64 bytes after screen)
PUT: wrapper for LDIR
SCROLL: text display scrolling
SOUND: set AY registers
SPEED: set CPU speed for clones
But I can also provide support for the one everyone is always asking for:
PLAY
All of this can be done without requiring either the SE Basic ROM or the 128 ROM. Having said that PLAY isn't very versatile, can't be interrupt driven, and has a fairly large RAM overhead (the routine takes 2296 bytes).