ZX BASIC
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javascript
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example
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| BORDER color
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BORDER( color )
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BORDER( 1 )
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| CLS
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CLS()
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CLS()
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DATA d1,d2,d3
RESTORE line_number
READ v1,v2,v3
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DATA(d1,d2,d3)
RESTORE(function_name)
v1 = READ()
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function ages() {
DATA("david",19)
}
function main() {
RESTORE(ages)
name = READ()
age = READ()
}
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| DRAW dx,dy
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DRAW(dx,dy)
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DRAW(20,10)
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FILL(x,y,margin_color)
FILL(x,y,substitute_color)
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FILL(128,64,5)
FILL(128,64,-1)
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| INK color
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INK(color)
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INK(4)
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| INKEY$
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INKEY$()
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a$ = INKEY$()
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INPUT n
INPUT s$
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n = await INPUT()
s$ = await INPUT$()
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n = await INPUT()
s$ = await INPUT$()
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| OVER n
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OVER(mode)
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OVER(0)
OVER(1)
OVER(2)
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| PAPER color
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PAPER(color)
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PAPER(2)
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| PAUSE frames
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await PAUSE(frames)
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await PAUSE(50)
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| PEEK memory_address
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PEEK( ascii_address )
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PEEK( USR("3") )
PEEK( 65*8 )
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PIANO( organ_or_piano_mode )
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PIANO(1)
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| PLOT x,y
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PLOT(x,y)
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PLOT(128,96)
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| POINT coordinates
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POINT( x,y )
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color = POINT(255,191)
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| POKE memory_address
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POKE( ascii_address )
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POKE( USR("3"), 255 )
POKE( 65*8, 0 )
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PRINT AT lin,col;
PRINT TAB col;
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AT(lin,col)
TAB(col)
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AT(2,3)
TAB(5)
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PRINT arg
PRINT arg;
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PRINTLN(arg)
PRINT(arg)
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PRINTLN("Hello")
PRINT(123)
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RANDOMIZE
RANDOMIZE seed
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RANDOMIZE()
RANDOMIZE(seed)
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RANDOMIZE()
RANDOMIZE(123)
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SCROLL
(available on ZX81)
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SCROLL()
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SCROLL()
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SOUND( beep_or_piano_mode )
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SOUND(1)
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USR "A"
USR "U"
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USR( ascii_char )
USR( ascii_code )
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USR( "3" )
USR( 255 )
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Math constants:
PI
Math operations:
a AND b ==> a && b
a OR b ==> a || b
NOT a ==> !a NOT(a)
a = b ==> a == b
b ^ e ==> POW(b,e)
a-b*INT(a/b) ==> a % b
Math functions:
positive = ABS(real)
real = ACS(real)
real = ASN(real)
real = ATN(real)
decimal = BIN( binary_string$ )
character$ = CHR$( ASCII_code )
ASCII_code = CODE( character$ )
real = COS(real)
binary$ = DEC$(decimal_integer)
real = EXP(real)
integer = INT(real)
length = LEN( string$ )
real = LN(real)
boolean = NOT(number)
power = POW(base,exponent)
real = RND()
integer = SGN(real)
real = SIN(real)
real = SQR(real)
string$ = STR$( real )
real = TAN(real)
string$ = TO$( string$, start, end )
address = USR(char$)
address = USR(code)
real = VAL(string$)
Note
In javascript, lowercase and uppercase identifiers are different.
In javascript, strings start at 0 index!
Example in BASIC: LET t$ = s$( 1 TO LEN(s$) )
Example in javascript: t$ = TO( s$, 0, LEN(s$)-1 )
In javascript "^" is a different operation.
Instead of base^exponent
you should use POW(base,exponent)
In javascript you cannot modify a string.
Instead of LET s$[5] = "A"
you should use s$ = TO$( s$, 0, 4-1 ) + "A" + TO$( s$, 4+1, LEN(s$)-1 )
(Because strings start at 0 index, 5 become 4.)
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