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Routines |
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| wait_key_poll | BA9E | XOR A | A=0 selects every half-row; return as soon as any key is down | |
| BA9F | CALL read_port | |||
| BAA2 | RET NZ | |||
| BAA3 | DEC HL | inner count | ||
| BAA4 | LD A,H | |||
| BAA5 | OR L | |||
| BAA6 | JR NZ,wait_key_poll | |||
| BAA8 | DJNZ wait_key_poll | outer count | ||
| BAAA | RET | |||
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