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  why is there 2 halt on waitretrace macro?
Posted by: maeloterkim - 09-09-2021, 06:02 PM - Forum: Help & Support - Replies (1)

why is there 2 halt on waitretrace macro?

i found in the library this waitretrace macro in the  retrace.bas  file

REM simple WaitRetrace macro

#ifndef waitretrace
#define waitretrace 'REM Retrace \
asm \
halt \
halt \
end asm

#endif


Is not better put only one halt for better timer control of the programmer?

if there was only one halt is more easy to control

with one halt we can do

waitretrace  ->  only 1 halt  1/50 seconds

2 halt      -> 2/50seconds
waitretrace   
waitretrace    

N halt    -> N/50seconds
for i = 1 to N
   waitretrace
next i

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  It is possible to read the state of the flags with basic
Posted by: maeloterkim - 09-07-2021, 03:12 PM - Forum: Help & Support - Replies (2)

Hi  Smile

In assembler there is a register that have the state of the flags zero, carry , etc

It is possible to read the state of the flags ONLY WITH BASIC (NOT ASSEMBLER) or the state of the carry flag, zero flag etc

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  Is posible put a ubyte variable just after DIM
Posted by: maeloterkim - 09-04-2021, 02:17 PM - Forum: Help & Support - Replies (2)

Hi

Is posible put a ubyte variable just after DIM   WITHOUT ASSEMBLER  maybe with AT @  or something

Example:

Code:
DIM udg(1, 7) AS uByte => {{0,1,3,7,15,31,63,127}, _
                           {1,2,4,7,15,31,63,127}}

DIM myVariable as ubyte 

I WANT THIS VARIABLE VALUE JUST THE NEXT BYTE AT THE END OF LAST UDG DIM BYTE LIKE THIS

ADDRESS       1  2  3  4   5   6   7   8     9  10   11  12   13   14   15   16        17
VALUE         0  1  3  7  15  31  63  127    1   2   4    7   15   31   63   127    myVariable
              --------------------      DIM UDG  -------------------------------
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  print42() to allow CR chr$(13)
Posted by: RandomiserUsr - 09-03-2021, 11:16 PM - Forum: Wishlist - Replies (2)

Trying to use CHR$(13) in print42() and it is ignored - could this be implemented please?


Thanks

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  struggle on using/implementing sprite libraries
Posted by: nitrofurano - 08-25-2021, 08:02 PM - Forum: Wishlist - Replies (2)

since a long time i was thinking how simple or possible would be using sprite engines/libraries on zxbasic-compiler (just like those used on z88dk and so on)

so i started to try this (very glitchy and inefficient, as the code shows... Big Grin  )

(wsad or cursors for moving)

Code:
ink 1
border 1:ink 5:bright 1: paper 1: cls

sub putudgsprite(txp1 as uinteger,typ1 as uinteger,tad1 as uinteger)
  poke uinteger $5C7B,tad1+(7-(typ1 mod 8))+(txp1 mod 8)*32
  print at int(typ1/8),int(txp1/8);"\A\C"
  print at 1+int(typ1/8),int(txp1/8);"\B\D"
  end sub

yo=0:xo=0
putudgsprite(xo,yo,@udg01)
x1=128:y1=128

do
  cn1=((255-(in 64510)) band 2)/2 bor ((255-(in 65022)) band 2) bor ((255-(in 65022)) band 1)*4 bor ((255-(in 65022)) band 4)*2 :'- wsad
  cn2=((255-(in 61438)) band 8)/8 bor ((255-(in 61438)) band 16)/8 bor ((255-(in 63486)) band 16)/4 bor ((255-(in 61438)) band 4)*2 :'-7658
  cn0=cn1 bor cn2
  x1=x1-((cn0 band 4)/4)
  x1=x1+((cn0 band 8)/8)
  y1=y1-((cn0 band 1)/1)
  y1=y1+((cn0 band 2)/2)
  over 1 
  putudgsprite(xo,yo,@udg01)
  xo=x1:yo=y1
  putudgsprite(x1,y1,@udg01)
  pause 1
  loop

do:loop

udg01:
asm
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000

defb %11111111
defb %11111111
defb %11111111
defb %11111111
defb %11111111
defb %11111111
defb %11111111
defb %11111111

defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000

defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000

defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000

defb %01111111
defb %01111111
defb %01111111
defb %01111111
defb %01111111
defb %01111111
defb %01111111
defb %01111111

defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000

defb %10000000
defb %10000000
defb %10000000
defb %10000000
defb %10000000
defb %10000000
defb %10000000
defb %10000000

defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000

defb %00111111
defb %00111111
defb %00111111
defb %00111111
defb %00111111
defb %00111111
defb %00111111
defb %00111111

defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000

defb %11000000
defb %11000000
defb %11000000
defb %11000000
defb %11000000
defb %11000000
defb %11000000
defb %11000000

defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000

defb %00011111
defb %00011111
defb %00011111
defb %00011111
defb %00011111
defb %00011111
defb %00011111
defb %00011111

defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000

defb %11100000
defb %11100000
defb %11100000
defb %11100000
defb %11100000
defb %11100000
defb %11100000
defb %11100000

defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000

defb %00001111
defb %00001111
defb %00001111
defb %00001111
defb %00001111
defb %00001111
defb %00001111
defb %00001111

defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000

defb %11110000
defb %11110000
defb %11110000
defb %11110000
defb %11110000
defb %11110000
defb %11110000
defb %11110000

defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000

defb %00000111
defb %00000111
defb %00000111
defb %00000111
defb %00000111
defb %00000111
defb %00000111
defb %00000111

defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000

defb %11111000
defb %11111000
defb %11111000
defb %11111000
defb %11111000
defb %11111000
defb %11111000
defb %11111000

defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000

defb %00000011
defb %00000011
defb %00000011
defb %00000011
defb %00000011
defb %00000011
defb %00000011
defb %00000011

defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000

defb %11111100
defb %11111100
defb %11111100
defb %11111100
defb %11111100
defb %11111100
defb %11111100
defb %11111100

defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000

defb %00000001
defb %00000001
defb %00000001
defb %00000001
defb %00000001
defb %00000001
defb %00000001
defb %00000001

defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000

defb %11111110
defb %11111110
defb %11111110
defb %11111110
defb %11111110
defb %11111110
defb %11111110
defb %11111110

defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000
defb %00000000

end asm

so, any idea of using "true" sprites instead of that attempt above? Big Grin

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  #include MACRO
Posted by: RandomiserUsr - 08-21-2021, 11:48 AM - Forum: Help & Support - Replies (2)

I wonder if you could show some examples of how to use #include MACRO introduced in 1.5.1 as I don't see anything in the wiki

thanks

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  loading files from +3 dsk
Posted by: nitrofurano - 08-07-2021, 09:39 PM - Forum: Help & Support - Replies (5)

recently i was trying this
https://worldofspectrum.org/forums/discu...n-assembly
is there some more efficient way, that works?
all my examples there were totally made on ZX-Basic Compiler - i'm now stuck in the last one, i only can load one file when it was supposed to load more...

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  LRIM/RTRIM/TRIM built in functions
Posted by: RandomiserUsr - 08-01-2021, 10:00 AM - Forum: Wishlist - Replies (3)

It would be handy to have a 

LTRIM
RTRIM
TRIM

functions built in to ZXB

I know you could right one but I wonder if there is a faster way to be compiled?

thanks

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  https://zxbasic.readthedocs.io down?
Posted by: RandomiserUsr - 06-10-2021, 08:04 PM - Forum: Documentation - Replies (3)

Hi

Not sure if this is the best place to report this but https://zxbasic.readthedocs.io/ seems to be not working?

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  GOTO inside a function question?
Posted by: RandomiserUsr - 06-05-2021, 03:14 PM - Forum: Help & Support - Replies (3)

I have two functions that have a return 0 


Code:
FUNCTION processTest(test INTEGER) as INTEGER

......processing stuff

IF X=1 THEN
   poke TestAddress, 1
   GOTO displayMsg
END IF

return 0
END FUNCTION


Does the this cause any memory leaks on the stack?
i.e. by not "returning" something is left on the stack and won't be removed?

I remember something about GOSUB/RETURN having this or am I okay to not RETURN (I am experimenting before you may say it's not "good practice  Smile    )


Thanks in advance

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