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Routines |
| Prev: 1C01 | Up: Map | Next: 1C1F |
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The address of this routine is derived from an offset found in the command class table.
The commands of class +03 may, or may not, be followed by a number. e.g. RUN and RUN 200.
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| CLASS_03 | 1C0D | CALL FETCH_NUM | A number is fetched but zero is used in cases of default. | |||||||
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The address of this entry point is derived from an offset found in the command class table.
The commands of class +00 must not have any operands, e.g. COPY and CONTINUE.
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| CLASS_00 | 1C10 | CP A | Set the zero flag for later. | |||||||
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The address of this entry point is derived from an offset found in the command class table.
The commands of class +05 may be followed by a set of items, e.g. PRINT and PRINT "222".
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| CLASS_05 | 1C11 | POP BC | In all cases drop the address - SCAN_LOOP. | |||||||
| 1C12 | CALL Z,CHECK_END | If handling commands of classes +00 and +03 and syntax is being checked move on now to consider the next statement. | ||||||||
| 1C15 | EX DE,HL | Save the line pointer in the DE register pair. | ||||||||
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After the command class entries and the separator entries in the parameter table have been considered the jump to the appropriate command routine is made.
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| 1C16 | LD HL,($5C74) | Fetch the pointer to the entries in the parameter table from T-ADDR and fetch the address of the required command routine. | ||||||||
| 1C19 | LD C,(HL) | |||||||||
| 1C1A | INC HL | |||||||||
| 1C1B | LD B,(HL) | |||||||||
| 1C1C | EX DE,HL | Exchange the pointers back and make an indirect jump to the command routine. | ||||||||
| 1C1D | PUSH BC | |||||||||
| 1C1E | RET | |||||||||
| Prev: 1C01 | Up: Map | Next: 1C1F |