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Purpose: Perform RAM test Call address: $FF87 (hex) 65415 (decimal) Communication registers: A, X, Y Preparatory routines: None Error returns: None Stack requirements: 2 Registers affected: A, X, Y |
Description:
This routine is used to test RAM and set the top and bottom of memory pointers accordingly. It also clears locations $0000 to $0101 and $0200 to $03FF. It also allocates the cassette buffer, and sets the screen base to $0400. Normally, this routine is called as part of the initialization process of a Commodore 64 program cartridge.
EXAMPLE:
JSR RAMTAS