BASIC-80 and CP/M
Where to begin; Using data in a program; Looping and branching; Numbers and things; Using strings; Subroutines and user-defined functions; Sequential disk file operations; Random access disk file operations; Skip sequential disk file operations; Sorting and searching; A simple simulation; CP/M and BASIC-80; Debugging and error trapping.
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0PEN 20 PRINT algorithm array ARTICLE file ASCII binary search blank spaces bubble sort C0UNT characters CL0SE command CONTROL-C CP/M digits direct mode disk file entry equal error message error trapping example executed FIELD statement file buffer following program G0SUB GOSUB GOTO gram IF-THEN statement income statement infinite loop INPUT ENTER INPUT statement integer numbers keyword loop counter LSET MBASIC memory Night Probe number of records numeric variable ON-GOTO OPERATIONS option output present value press the RETURN PRINT WIPES printer program control program in Figure random access files random file random numbers record counter record number REM statement result RETURN key run the program screen SDATA sequential files single precision number SS file statement in line stored string data string variable subroutine TERMINAL terminal value TESR0F THE EDIT0R THINGS truth table User-defined functions variable name Write a program zip code