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software:upi_conventions [2016/06/14 10:25] ex_writer [User-Defined Subroutines] |
software:upi_conventions [2016/06/14 10:45] (current) ex_writer [Example: Space Fortress User Subroutine] |
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| ; [...] | ; [...] | ||
| + | LD HL,$1FA7 | ||
| + | LD ($4FFD),HL ; $4FFD is USER Table Base + routine = JumP address | ||
| + | LD HL,$1FE9 | ||
| + | LD ($4FFB),HL ; $4FFB is User Mask ARGument Table + (routine / 2) | ||
| + | LD A,R | ||
| + | AND $1C | ||
| + | LD ($4F2A),A | ||
| + | L2FEE LD HL,L2FEE ; $2FEE is current program counter address | ||
| + | PUSH HL | ||
| + | EI | ||
| ; Call User's Macro Subroutine $80 | ; Call User's Macro Subroutine $80 | ||
