C64 ROM: Routine at FF99

Used by the routine at E3BF.

this routine is used to read and set the top of RAM. When this routine is called with the carry bit set the pointer to the top of RAM will be loaded into XY. When this routine is called with the carry bit clear XY will be saved as the top of memory pointer changing the top of memory.

Used by the routine at E3BF. this routine is used to read and set the top of RAM. When this routine is called with the carry bit set the pointer to the top of RAM will be loaded into XY. When this routine is called with the carry bit clear XY will be saved as the top of memory pointer changing the top of memory.
FF99	4C 25 FE	JMP $FE25	read/set the top of memory