i don't know if is a bug or what with beeper sound routine

[maeloterkim]

Hi

THIS CODE WORKS AS EXPECTED

1) CLS
2) Print "Hello"
3) Make a sound with assembler subroutine
4) Print "World"
5) Make the STOP

--------INI CODE ---------------------------------------------------------------------------------------------

SUB mySound()
ASM
LD B,5
loop:
PUSH BC
LD HL,768
anotherLoop:
LD DE,1
PUSH HL
CALL 949 ;'ROM BEEPER ROUTINE 949 = $3B5
POP HL
LD DE,16
AND A
SBC HL,DE
JR NZ, anotherLoop
POP BC
DJNZ loop
RET
END ASM
END SUB

CLS : REM 'Clear screen

PRINT "Hello" : REM 'Print Hello on screen

mySound() : REM 'Make the sound

PRINT "World" : REM 'Print World on screen

STOP : REM STOP the program

----------------- END CODE ----------------------------------------------------------------------------------------------------

But if i change something, doesn't work

Per example :

1) ¿BUG ERROR?
If i change the assembler code and i put PUSH IX AT THE BEGINNING AND POP IX AT THE END
that is the advice in this forum to all assembler routines

SUB mySound()
ASM
PUSH IX ; This make the program not work properly
LD B,5
......
......
......
DJNZ loop
POP IX ; This make the program not work properly
RET
END ASM
END SUB

doesn't work


2) ¿BUG ERROR?
If i add some blank space to the words printed per example "hello " blank space at the end or somewhere
or at the printed word "world " make the program not work properly and don't execute the last print and the stop

3) ¿BUG ERROR?
If i add ; at the end of the word "Hello" per example "Hello"; doesn't work either

4) ¿BUG ERROR?
If i make the words "Hello" and "World" variables Per example a$ = "Hello", b$ = "World"
anfd i make

PRINT a$ : REM 'Print Hello on screen

mySound() : REM 'Make the sound

PRINT b$ : REM 'Print World on screen

doesn't work either


-----------------------------------------------------------------------------------------------------------------

I don't know what is going on ¿?¿?¿

Thanks