Games - Galaksija BASIC

Home > Listing Index > Games > Galaksija BASIC

	Games - Galaksija BASIC

Galaksija BASIC was the BASIC interpreter of the Galaksija built-it-yourself home computer from Yugoslavia. While being based on Microsoft Level 1 BASIC, the extensive modifications of Galaksija BASIC—to include video generation code (as the CPU itself did it in absence of dedicated video circuitry) and generally improve the language—is said to have left not much more than flow-control and floating point code remaining from the original.

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)
#
& - prefix for hex numbers
ARR$(n) - (need details here)
BYTE serves as PEEK
when used as a function (e.g. PRINT BYTE(11123)) and POKE
when used as a command (e.g. BYTE 11123,123).
CALL n (e.g. CALL 100+4*X)
CHR$(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.
EDIT n causes specified program line to be edited
ELSE standard part of IF-ELSE construct (Galaksija did not use THEN)
EQ - (need details here)
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
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 consuption data (need details here)
NEW clears the current BASIC program
NEW n - (need details here)
NEXT - standard terminator of FOR loop
OLD - loads a program from tape
OLD n (need details here)
PTR
PRINT
RETURN
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
UNDOT x,y "undraws" (resets) at specified coordinates (see DOT)
UNDOT *
USR
WORD

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)

[ Visit the complete Wikipedia entry for Galaksija BASIC ]

Searches on eBay

galaksija basic