Remote Processing CAMBASIC - Manual (Page 97)

Comm ands - 64
EXAMPLE: 10 ON KEYPAD$ 24 GOSUB 500
20 DISPLAY (1,0);
30 INPUT KEYPAD$ 10,"Enter weight",WEIGHT
40 PRINT WEIGHT
50 INPUT KEYPAD$ 10,"Enter name ";NAME$
.
.
.
500 C$ = KEYPAD$(1)
510 RETURN
The ON K EYPA D$ syntax above may be different for your car d.
ERROR: < Data negative> - echo port
< Data > 255> - echo port