Spectrum ROM | Routines |
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The address of this routine is found in the parameter table.
The 'variable in assignment' has already been determined (see CLASS_04), and it remains to change the VALUE as required.
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NEXT | 07595 | BIT 1,(IY+55) | Jump to give the error report if the variable was not found. | ||||
07599 | JP NZ,REPORT_2 | ||||||
07602 | LD HL,(23629) | The address of the variable is fetched from DEST and the name tested further. | |||||
07605 | BIT 7,(HL) | ||||||
07607 | JR Z,REPORT_1 | ||||||
Next the variable's VALUE (v) and STEP (s) are manipulated by the calculator.
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07609 | INC HL | Step past the name. | |||||
07610 | LD (23656),HL | Make the variable a temporary 'memory area' by setting MEM. | |||||
07613 | RST 40 | - | |||||
07614 | DEFB 224 | get_mem_0: v | |||||
07615 | DEFB 226 | get_mem_2: v, s | |||||
07616 | DEFB 15 | addition: v+s | |||||
07617 | DEFB 192 | st_mem_0: v+s (v is replaced by v+s in mem-0) | |||||
07618 | DEFB 2 | delete: - | |||||
07619 | DEFB 56 | end_calc: - | |||||
The result of adding the VALUE and the STEP is now tested against the LIMIT by calling NEXT_LOOP.
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07620 | CALL NEXT_LOOP | Test the new VALUE against the LIMIT. | |||||
07623 | RET C | Return now if the FOR-NEXT loop has been completed. | |||||
Otherwise collect the 'looping' line number and statement.
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07624 | LD HL,(23656) | Find the address of the low byte of the looping line number (MEM+15). | |||||
07627 | LD DE,15 | ||||||
07630 | ADD HL,DE | ||||||
07631 | LD E,(HL) | Now fetch this line number. | |||||
07632 | INC HL | ||||||
07633 | LD D,(HL) | ||||||
07634 | INC HL | ||||||
07635 | LD H,(HL) | Followed by the statement number. | |||||
07636 | EX DE,HL | Exchange the numbers before jumping forward to treat them as the destination line of a GO TO command. | |||||
07637 | JP GO_TO_2 | ||||||
Report 1 - NEXT without FOR.
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REPORT_1 | 07640 | RST 8 | Call the error handling routine. | ||||
07641 | DEFB 0 |
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