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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 | 1615 | LD ($5C51),HL | The HL register pair holds the base address for a particular channel; set CURCHL accordingly. | |||||
| 1618 | RES 4,(IY+$30) | Signal 'using other than channel 'K'' (reset bit 4 of FLAGS2). | ||||||
| 161C | INC HL | Step past the output and the input addresses and make HL point to the channel code. | ||||||
| 161D | INC HL | |||||||
| 161E | INC HL | |||||||
| 161F | INC HL | |||||||
| 1620 | LD C,(HL) | Fetch the code. | ||||||
| 1621 | LD HL,$162D | The base address of the channel code look-up table. | ||||||
| 1624 | CALL INDEXER | Index into this table and locate the required offset, but return if there is not a matching channel code. | ||||||
| 1627 | RET NC | |||||||
| 1628 | LD D,$00 | Pass the offset to the DE register pair. | ||||||
| 162A | LD E,(HL) | |||||||
| 162B | ADD HL,DE | Point HL at the appropriate flag setting routine. | ||||||
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This entry point is used by the routine at OUT_CODE.
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| CALL_JUMP | 162C | JP (HL) | Jump to the routine. | |||||
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