Missing commands and functions from PC BASIC

[aowendev]

Allocated but not used

• EOF # -1 if file number has reached end of file, else 0.
• LOC # location in current file number
• LOF # length of current file number
• USING with PRINT
• SPC with PRINT
• SCREEN code point at given position

There are 12 unallocated tokens. $ff should be reserved for double-byte tokens which will be user defined commands extensions. Checkmarks indicate preferences.

Functions

• DATE should return 32-bit system variable value (using stack BCDE function)
• ERL line number of last error
• ERR number of last error
• FRE available BASIC memory
• MOUSE mouse values
• POINT if a pixel is set
• POS current column position
• STICK joystick values

Commands

• AUTO auto produce line numbers
• CHAIN load a program and run it while retaining variables
• DEF SEG define memory area to be used by BLOAD, BSAVE, CALL, PEEK, POKE and USR.
• ERASE deallocate array
• GET various
• PUT various
• LINE graphics instruction
• NOISE audio
• OPTION BASE start of arrays to 1 or 0
• PAINT graphics fill
• SWAP switch two variables