Keyboard Microsoft BASIC
(this is a stub article. must upload photos of BASIC cart as well.)
Microsoft ported a version of its ubiquitous BASIC to the Intellivision Keyboard Component. It reports itself as "Intellivision BASIC" with the following copyright: "Copyright Microsoft, Mattel 1980."
The version found on the Keyboard Component appears to be based off the same 8K BASIC that other late-70s and early 80s machines used. Similarities included the cryptic 2-character error codes associated with those versions of BASIC. The BASIC interpreter is a 6502-specific program that does not appear to make use of any Master Component functionality. The BASIC interpreter is 8K bytes in size, and resides at $E000 - $FFFF in the address map.
The BASIC interpreter supports the following keywords:
END PRINT SGN FOR CONT INT NEXT LIST ABS DATA CLEAR VER INPUT PRT FRE DIM NEW POS READ TAB( SQR LET TO RND GOTO FN LOG RUN SPC( EXP IF THEN COS RESTORE NOT SIN GOSUB STEP TAN RETURN + ATN REM - GETC STOP * LEN ON / STR$ PLOD # VAL PSAV AND ASC VLOD OR CHR$ VSAV > LEFT$ DEF = RIGHT$ SLOD < MID$
It reports the following error codes:
GO ?? NF NEXT without FOR SN Syntax error RG RETURN without GOSUB OD Out of DATA. Attempted to READ beyond last DATA statement. FC Illegal function call (e.g. arguments are out of range) OV Numeric overflow OM Out of memory US Undefined line number BS Bad array subscript DD Attempt to re-DIM an array /0 Division by 0 ID Illegal direct-mode instruction. Instruction legal only inside a program. TM Type mismatch. (e.g. assigning a number to a string variable or vice versa) LS Long string. Strings have a maximum length of 255(?) chars. ST String operation is too complex CN Can't continue UF ?? Undefined user function? TR ?? Tape read error? TP ?? Tape error?