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The core implementation of the interpreter was fully contained in the 4  KiB ROM "A" Or "1" . The computer's original Mainboard had a reserved slot for an extension ROM "B" Or "2" that added more commands and features such as a built-in Z80 Assembler .


ROM "A"/"1" SYMBOLS AND KEYWORDS


The core implementation, in ROM "A" Or "1" , contained 3 special symbols and 32 keywords:
  • ! - begins a Comment (equivalent of standard BASIC REM command)

  • # - Equivalent of standard BASIC DATA statement

  • & - prefix for Hex numbers

  • ARR$(n) - Allocates an array of strings, like DIM, but can allocate only array with name A$

  • BYTE serves as PEEK when used as a function (e.g. PRINT BYTE(11123)) and POKE when used as a command (e.g. BYTE 11123,123).

  • CALL n Calls BASIC subroutine as GOSUB in most other BASICs (e.g. CALL 100+4---X)

  • CHR$(n) converts an ASCII numeric code into a corresponding character (string)

  • DOT x, y draws (command) or inspects (function) a pixel at given coordinates (0<=x<=63, 0<=y<=47).

  • DOT --- displays the clock or time controlled by content of Y$ variable. Not in standard ROM

  • EDIT n causes specified program line to be edited

  • ELSE standard part of IF-ELSE construct (Galaksija did not use THEN)

  • EQ - compare alphanumeric values X$ and Y$

  • FOR standard FOR Loop

  • GOTO standard GOTO command

  • HOME equivalent of standard BASIC CLS command - clears the screen

  • HOME n protects n characters from the top of the screen from being scrolled away

  • IF standard part of IF-ELSE construct (Galaksija did not use THEN)

  • INPUT user entry of variable

  • INT(n) a function that returns the greatest integer value equal to or lesser than n

  • KEY(n) test whether a particular Keyboard key is pressed

  • LIST lists the program. Optional numeric argument specifies the first line number to begin listing with.

  • MEM returns memory consumption data ''(need details here)''

  • NEW clears the current BASIC program

  • NEW n - clears BASIC program and moves beginning of BASIC area

  • NEXT - standard terminator of FOR Loop

  • OLD - loads a program from tape

  • OLD n - loads program to different address

  • PTR - Returns address of the variable

  • PRINT - Printing numeric or string expression.

  • RETURN - Return from BASIC subroutine

  • RND - function (takes no arguments) that returns a random number between 0 and 1.

  • RUN - runs (executes) BASIC program. Optional numeric argument specifies the line number to begin execution with.

  • SAVE - saves a program to tape. Optional two arguments specify memory range to be saved ''(need details here)''.

  • STEP - standard part of FOR Loop

  • STOP stops execution of BASIC program

  • TAKE - replacement for READ and RESTORE. If the parameter is variable name, acts as READ, if it is number, acts as RESTORE

  • UNDOT x, y "undraws" (resets) at specified coordinates (see DOT)

  • UNDOT --- - Stops the clock, not part of ROM

  • USR - Calls machine code subroutine

  • WORD - Double byte PEEK and POKE



ROM "B"/"2" ADDITIONAL SYMBOLS AND KEYWORDS


The extended BASIC features, in ROM "B" Or "2" , contained one extra reserved symbol and 22 extra keywords:
  • %

  • /''LABEL''

  • ABS(''x'')

  • ARCTG(''x'')

  • COS(''x''), '''COSD'''(''x'')

  • DEL

  • DUMP

  • EXP(''x'')

  • INP(''x'')

  • LDUMP

  • LLIST

  • LN(''x'')

  • LPRINT

  • OUT

  • PI

  • POW(''x'',''y'')

  • REN

  • SIN(''x''), '''SIND'''(''x'')

  • SQR(''x'')

  • TG(''x''), '''TGD'''(''x'')



SEE ALSO