... a character from coordinates x&y to a defined ... transfer a window defined by x,y, width and height?
... need to poke 4 addresses (X, Y, W, H) and call ... stores and restores the whole screen (excluding attributes if you ... the rest of the screen unaffected)

... a SAVE "x" CODE 32768, 32768 ad letting the R: Tape Loading Error ...

... LD SP,VRAM_TABLE + 2*Y-position
POP HL ... window limit of useable screen area to 32x16 attrs ... just 2/3 of the screen, regardles of the position ... any VRAM address from X,Y coordinates could be realized ...
LD A,_positionX X position (0-31) is MSB ...

... X(Y),64+(Y*2):
OVER 0: LET X(Y)=(6+X(Y)): LET R=INT ((X(Y)/256 ... )):
LET X(Y)=x(Y)-(256*R): PLOT X(Y),64+(Y*2 ... ):
NEXT Y ...

... NEXT f: LET x=9: LET y=1: LET p= ... x,y;" ": LET x=x+a: LET y=y+b:
LET t=(ATTR (x,y ... )7): PRINT AT x,y ... s+t: LET f=(x=21 AND (yp+5 ... y=1)-2*(y=30): LET a=a+2*(x=0)-2*(x ... can fit on one screen. The listing scrolls on ...

... names (like a, b, x, y etc) in BASIC, you won ... :

To copy SCREEN$ to memory address 32768
screen area is 6912 bytes long ... LD HL 16384 ; Start of screen area
LDIR ; do ... BC 6912 ; length of screen area is 6912 bytes long ...

... of the screen (hoping not to witness the terror of R Tape Loading ...

... TV has started drawing the screen proper. Watch out for collision ... attribute buffers to draw the screen).

4) Optimise the ... be updated before the main screen is encroached.

... number changes but not its (x,y) position, you may be able ...

... /> 440 REM f=enermy y
450 REM g= ... br /> 490 REM d(x,2)=enermy y position
500 ... an array to hold enermy x/y positions and whether the sprite ... is set with random x and y positions and set to ... is it has a valid x screen position.

With ...

... disp = zx_cyx2saddr(prow, pcol++); // destination screen address for char
if ... )) = attr; // colour char on screen

for (i= ...
main()
{
uchar x, y;

zx_border(1);

... variable p(n), rather than x(n),y(n), saving further space ... have maintained variables for ghost X and Y movement directions, and they ... elements needed)
q
r
s [S]core
x
y
z

... be printed at random (x,y) coordinates but if you ... never printed at certain (x,y) coordinates and you can ... wave in the random (x,y) coordinates selected for the ... the left edge of the screen.

However, ... to act directly on screen so that the large ...

... against the screen, try testing against the X/Y/Width/Height ... memory rather than from the screen itself.

... that holds an active sprites X, Y position, Width, Height, ... screen and attribute area, etc)
2) Use trivial rejection (compare X/Y ...

... all 6 buttons: L,R,A,B,X,Y. The only ones you ...

... all 6 buttons: L,R,A,B,X,Y. The only ones you ... some confusing system where L,R are shifts to change the ...

... player from getting "Out of Screen". Here's the latest (unfinished ... ; INK 1;"~~~~~~~~~~~~~~TTT~~~~~~~~~~~~~~~":
READ x,y,v,w,n,f:
LET o=x:
LET p=y:
LET a ... )*((IN 573420):
LET i=y>92:
NEXT i ... l=(ABS v+ABS w67)*(x

... [CODE]
1 DEF FN r(x)=IN x191 AND IN x0 ... )*FN r(32766):
LET b ... =(f>a)*(FN r(57342)-FN r(64510)):
LET ... /> LET x=x+v+158*((x+v157)):
LET y=(y+w)*(y+w> ... /5,o/5,AT y/5,x/5;CHR$ 144;AT ... RND-.5:
LET i=y>92:
NEXT ...

... would load , seeing the loading screen , wondering what the game will ... to load, especially after 3 R Tape Loading errors, when it finally ...

... all 6 buttons: L,R,A,B,X,Y. The only ones you ... START rather than ABX or Y as it may be a ...

... all 6 buttons: L,R,A,B,X,Y. The only ones you ...

... /> AT 7+i/5-.5-y,r+t
[/CODE]

AT 6.5+i/5-y,r+t
[/CODE]

screen. The current initial value for ...

... use reuse k instead of y.[/QUOTE]

I realized ... "$";c:
FOR r=1 TO 9:
LET p(r)=p(r)+(r

... all 6 buttons: L,R,A,B,X,Y. The only ones you ... are not aware of. The Y button cannot be mapped in ...

... ]
FOR r=1 TO 2
LET x=x(r,h)
< ... br /> LET new_x=adjust(x)

FOR r=1 TO 2
LET x=x(r,h)
< ... br /> LET new_x=adjust(x)
NEXT r
y(1,i),x(1,i);"o"; INK 2;AT y(2,i),x ...

... order to fill a blank screen you'd need several tens ... fill a blank screen. You control the initial x,y coord, the maximum ...