Routines |
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Used by the routine at OPEN.
The appropriate stream data bytes for the channel that is associated with the stream being opened are found.
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OPEN_2 | 175D | PUSH HL | Save HL. | |
175E | CALL STK_FETCH | Fetch the parameters of the channel code. | ||
1761 | LD A,B | Give an error if the expression supplied is a null expression, e.g. OPEN #5,"". | ||
1762 | OR C | |||
1763 | JR NZ,OPEN_3 | |||
This entry point is used by the routine at OPEN_P.
Report F - Invalid file name.
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REPORT_F | 1765 | RST $08 | Call the error handling routine. | |
1766 | DEFB $0E | |||
Continue if no error occurred.
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OPEN_3 | 1767 | PUSH BC | The length of the expression is saved. | |
1768 | LD A,(DE) | Fetch the first character. | ||
1769 | AND $DF | Convert lower case codes to upper case ones. | ||
176B | LD C,A | Move code to the C register. | ||
176C | LD HL,$177A | The base address of the OPEN stream look-up table. | ||
176F | CALL INDEXER | Index into this table and locate the required offset. | ||
1772 | JR NC,REPORT_F | Jump back if not found. | ||
1774 | LD C,(HL) | Pass the offset to the BC register pair. | ||
1775 | LD B,$00 | |||
1777 | ADD HL,BC | Make HL point to the start of the appropriate subroutine. | ||
1778 | POP BC | Fetch the length of the expression before jumping to the subroutine. | ||
1779 | JP (HL) |
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