Routines |
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OUT_CODE | 15EF | LD E,$30 | Increase the value in the A register by +30. | |||||
15F1 | ADD A,E | |||||||
This entry point is used by the routine at PRINT_A_1 with A holding the code of the character to be printed.
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PRINT_A_2 | 15F2 | EXX | Save the registers. | |||||
15F3 | PUSH HL | |||||||
15F4 | LD HL,($5C51) | Fetch the base address for the current channel (CURCHL). This will point to an output address. | ||||||
This entry point is used by the routine at INPUT_AD with A holding the code of the character to be printed.
Now call the actual subroutine. HL points to the output or the input address as directed.
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CALL_SUB | 15F7 | LD E,(HL) | Fetch the low byte. | |||||
15F8 | INC HL | Fetch the high byte. | ||||||
15F9 | LD D,(HL) | |||||||
15FA | EX DE,HL | Move the address to the HL register pair. | ||||||
15FB | CALL CALL_JUMP | Call the actual subroutine. | ||||||
15FE | POP HL | Restore the registers. | ||||||
15FF | EXX | |||||||
1600 | RET | Return will be from here unless an error occurred. |
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