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Routines |
| Prev: 54942 | Up: Map | Next: 54999 |
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Used by the routine at 54942.
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| 54950 | LD C,254 | Load C with 254 (as all keyboard half-row "input addresses" have C = 254) | ||||||
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The operand of the instruction at 54952 represents the MSB of the "input address" to use in reading the keyboard for the currently defined LEFT key. This is modified by the routine at 54647.
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| 54952 | LD B,127 | Load B with MSB of "input address" | ||||||
| 54954 | IN A,(C) | Read keyboard | ||||||
| 54956 | BIT 3,A | "N" key pressed so... | ||||||
| 54958 | CALL Z,55100 | ...store a LEFT input from control device | ||||||
| 54961 | LD B,127 | Load B with MSB of "input address" | ||||||
| 54963 | IN A,(C) | Read keyboard | ||||||
| 54965 | BIT 2,A | "M" key pressed so... | ||||||
| 54967 | CALL Z,55103 | ...store a RIGHT input from control device | ||||||
| 54970 | LD B,253 | IN 65022 reads the half row A to G... | ||||||
| 54972 | IN A,(C) | Read keyboard | ||||||
| 54974 | BIT 0,A | "A" key pressed so... | ||||||
| 54976 | CALL Z,55106 | ...store an UP input from control device | ||||||
| 54979 | LD B,254 | IN 65278 reads the half row CAPS SHIFT to V | ||||||
| 54981 | IN A,(C) | Read keyboard | ||||||
| 54983 | BIT 1,A | "Z" key pressed so... | ||||||
| 54985 | CALL Z,55109 | ...store a DOWN input from control device | ||||||
| 54988 | LD B,127 | IN 32766 reads the half row SPACE to B | ||||||
| 54990 | IN A,(C) | Read keyboard | ||||||
| 54992 | BIT 0,A | SPACE bar pressed so... | ||||||
| 54994 | CALL Z,55112 | ...store a FIRE input from control device | ||||||
| 54997 | LD A,(HL) | Load stored input into A | ||||||
| 54998 | RET | Return | ||||||
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