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Routines |
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Called from the main loop at 6229.
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| 698E | LD A,$FB | Read keys Q-W-E-R-T. | ||
| 6990 | IN A,($FE) | |||
| 6992 | AND $10 | Keep only bit 4 (corresponding to 'T'). | ||
| 6994 | LD HL,$7C6A | Pick up the last recorded 'T' pressed indicator. | ||
| 6997 | CP (HL) | Does the current value match? | ||
| 6998 | RET Z | Return if so. | ||
| 6999 | LD (HL),A | Save the current 'T' pressed indicator. | ||
| 699A | AND A | Is 'T' being pressed? | ||
| 699B | RET NZ | Return if not. | ||
| 699C | LD HL,$7C69 | Toggle the sound on/off indicator by flipping bits 3 and 4. | ||
| 699F | LD A,(HL) | |||
| 69A0 | XOR $18 | |||
| 69A2 | LD (HL),A | |||
| 69A3 | RET | |||
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