How to place assembly code at a specific address ?

[zx81ultra]

Hello,

How do I place assembly code at a specific address ?

Code: Select all

void SetPseudoHiRes(void)
{
#asm

start:                ld a,04h
                        ld i,a
                        ld ix,042c4h
                        ret

42c4                ld hl,0e6dfh        //code to be placed at 0x42c4
                        ld de,0021h
                        di        
                        ld c,0feh        
                        ld b,016h

42cf                djnz 042cfh                //code to be placed at 0x42cf
                        ld b,0c0h

Thank you.

[stefano]

This is part of the complexity of the thing you're trying to get. you need to deal with the position of the code blocks in zx81_crt0, it begins at 16515 (decimal) and includes external pieces of code, like the current display driver chosen with the compiler options.
don't give up, your concept code looks promising