Spectrum ROM | Routines |
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The routine at CHAN_OPEN continues here.
The appropriate flags for the different channels are set by this subroutine.
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CHAN_FLAG | 05653 | LD (23633),HL | The HL register pair holds the base address for a particular channel. | ||||
05656 | RES 4,(IY+48) | Signal 'using other than channel 'K''. | |||||
05660 | INC HL | Step past the output and the input addresses and make HL point to the channel code. | |||||
05661 | INC HL | ||||||
05662 | INC HL | ||||||
05663 | INC HL | ||||||
05664 | LD C,(HL) | Fetch the code. | |||||
05665 | LD HL,5677 | The base address of the channel code look-up table. | |||||
05668 | CALL INDEXER | Index into this table and locate the required offset, but return if there is not a matching channel code. | |||||
05671 | RET NC | ||||||
05672 | LD D,0 | Pass the offset to the DE register pair. | |||||
05674 | LD E,(HL) | ||||||
05675 | ADD HL,DE | Point HL at the appropriate flag setting routine. | |||||
This entry point is used by the routine at OUT_CODE.
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CALL_JUMP | 05676 | JP (HL) | Jump to the routine. |
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