Galaksija BASIC - ROM "A"/"1" Symbols and Keywords

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