BASIC Compatibility With Early PC-1500 Models
Some earlier model PC-1500's will show a value 1 less in the FOR...NEXT counter on exiting the loop compared to later PC-1500's and the PC-1600.
For example:
10 FOR K=1 TO 10
20 NEXT K
30 PRINT K
K will be set to 11 on later model PC-1500's and PC-1600's, but will be 10 on early PC-1500's.
Consider this example:
10 S=0
20 FOR K=1 TO 10 STEP 4
30 S=S+1
40 NEXT K
50 PRINT S
S will be set to 3 on later model PC-1500's and PC-1600's, but will be 4 on early PC-1500's.
Early model PC-1500's evaluate IF...THEN statements differently. The behaviour can be summarised thus:
| Model | True | False |
|---|---|---|
| PC-1600 / Later PC-1500 | ≠0 | 0 |
| Early PC-1500 | >0 | <0 |
An early model PC-1500 can be detected by using the command: PEEK&C5C0.
If the value returned is 6, it is an early model.
Read more about this topic: Sharp PC-1500
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