Galaksija BASIC
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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 Zilog Z80 assembler.
ROM "A"/"1" symbols and keywords
The core implementation, in ROM "A" or "1", contained 3 special symbols and 32 keywords:
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- begins a comment (equivalent of standard BASIC REM command)
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- Equivalent of standard BASIC DATA statement
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- prefix for hex numbers
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- Allocates an array of strings, like DIM, but can allocate only array with name A$
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- 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).
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- Calls BASIC subroutine as GOSUB in most other BASICs (e.g. CALL 100+4*X)
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- converts an ASCII numeric code into a corresponding character (string)
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- draws (command) or inspects (function) a pixel at given coordinates (0<=x<=63, 0<=y<=47).
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- displays the clock or time controlled by content of Y$ variable. Not in standard ROM
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- causes specified program line to be edited
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- standard part of IF-ELSE construct (Galaksija did not use THEN)
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- compare alphanumeric values X$ and Y$
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- standard FOR loop
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- standard GOTO command
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- equivalent of standard BASIC CLS command - clears the screen
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- protects n characters from the top of the screen from being scrolled away
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- standard part of IF-ELSE construct (Galaksija did not use THEN)
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- user entry of variable
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- a function that returns the greatest integer value equal to or lesser than n
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- test whether a particular keyboard key is pressed
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- lists the program. Optional numeric argument specifies the first line number to begin listing with.
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- returns memory consumption data (need details here)
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- clears the current BASIC program
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- clears BASIC program and moves beginning of BASIC area
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- standard terminator of FOR loop
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- loads a program from tape
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- loads program to different address
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- Returns address of the variable
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- Printing numeric or string expression.
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- Return from BASIC subroutine
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- function (takes no arguments) that returns a random number between 0 and 1.
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- runs (executes) BASIC program. Optional numeric argument specifies the line number to begin execution with.
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- saves a program to tape. Optional two arguments specify memory range to be saved (need details here).
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- standard part of FOR loop
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- stops execution of BASIC program
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- replacement for READ and RESTORE. If the parameter is variable name, acts as READ, if it is number, acts as RESTORE
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- "undraws" (resets) at specified coordinates (see DOT)
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- Stops the clock, not part of ROM
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- Calls machine code subroutine
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- 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:
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See also
- Voja Antonić, creator of Galaksija and this BASIC
References
External links
- Uputstvo za upotrebu, user manual online, complete, original, in Serbian language
- ↑ Antonić, Voja (creator), 1983 - Galaksija