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Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…
Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…
... 9
loop2 push bc
push de
loop push bc
ld b, ... br /> inc l
pop bc
djnz loop< ... ldi
pop hl
pop bc
djnz loop2 ...Anyone help re-factoring a tile functionI had some excellent feedback for re-factoring my function that displays the colour for my screen tiles. Can anyone offer some help to improve the fu…
... B,16
PRTTILELOOPX PUSH BC
PUSH DE
LD A ...
CALL PRINTTILE
POP DE
POP BC
INC E ...Installing Z88DK Z88DK INSTALLATION Z88DK is distributed in two parts. The first part is the platform independent bits (including source and z80 libraries) and th…
... pop bc
pop de
pop bc
push hl
push de ... call sp_LookupKey
pop bc
pop bc
push hl
... /> pop bc
pop hl
push hl
push hl< ... pop bc
pop hl
push hl
push bc
push hl ...Saboteur - Safe or secret place?Hello. Im sure many of you played Saboteur. When you are on the 1st floor (the floor you start), you can see a blocked ladder on a screen just before…
... b_b org 24576
push af
ld a ... jp $c632
map_down pop af
jp $c612
map_left pop af
jp $c328
BEEPing in assemblyI'm using Z88DK and I'd like to know how to produce BEEPs. I know it's a matter of writting very fast to a certain port, but I've read somewhere that…
... tone)
{
#asm
pop bc ; bc = return address
pop de ; de = cycles
push de
push hl
push bc ...How do I get a random numberHi, I need a simple routine to get a random number from 1 to 4. I don't need nothing very complex or that much random, it just have to produce diffe…
Random:
push hl
ld a,r
ld hl,RandSeed
add a,(hl)
rrc a
ld (hl),a
pop hl
ret
RandSeed:
defb 91How do I get a random numberHi, I need a simple routine to get a random number from 1 to 4. I don't need nothing very complex or that much random, it just have to produce diffe…
... :
Random:
push hl
ld a,r ... br /> ld (hl),a
pop hl
ret
[code]
Random:
push hl
ld a,r ... br /> ld (hl),a
pop hl
AND 3 ; number ...T.I.M. - A New Interlace - Demo for DOWNLOADHere's something that's been in the works for quite a while ( mostly in my head ) and recently I've aquired assistance to help it come to fruition. …
...
push iy
push ix
push bc
push de
push af ... /> pop bc ;38
ld sp, hl ;6
push ... /> pop bc ;38
ld sp, hl ;6
push ...Hi-Score tableThe score in my game occupies 3 bytes. I want to create a hi-score but I'm not sure of the best way to work out where a new score would fit in the ta…
... LD B,3
PUSH DE ; SAVE POINTER
POP DE ; EQUAL AND HIGHER VALUES ARE INSERTED ON TOP
PUSH ... ; THE SHIFT
POP DE
LD HL ... /> RET
SMAL POP DE
INC DE ...Hi-Score tableThe score in my game occupies 3 bytes. I want to create a hi-score but I'm not sure of the best way to work out where a new score would fit in the ta…
... POP DE ; EQUAL AND HIGHER VALUES ARE INSERTED ON TOP
PUSH ...Push/Pop methodMachine code question: Could somebody explain, how do we use the stack in assembler to copy data from one place of memory to another? I've heard it i…
... data to copy
POP into registers
Set ... be copied to.
PUSH the registers, thereby copyint the ...Push/Pop methodMachine code question: Could somebody explain, how do we use the stack in assembler to copy data from one place of memory to another? I've heard it i…
... data to copy
POP into registers
Set ... be copied to.
PUSH the registers, thereby copyint the ... SP,POP-stack
POPPERDEPOP etc...
LD SP,PUSH-STACK
128 ramdisk loaderanyone got a program which will save the contents of ramdisk to tape in one go, rather than saving each file seperately then loading them and save!in…
... ),a
ei
push bc
push hl
ld ix ... ,4000h
call 04C2h ; **
pop hl
inc hl
pop bc
jr loop
< ...Z80 QuestionCan the instruction EX DE,HL be prefixed with DD to give EX DE,IX? Derek
... this
PUSH DE
PUSH IX
POP DE
POP IXZ80 QuestionCan the instruction EX DE,HL be prefixed with DD to give EX DE,IX? Derek
... this
PUSH DE
PUSH IX
POP DE
POP IXZ80 QuestionCan the instruction EX DE,HL be prefixed with DD to give EX DE,IX? Derek
i prefer this :)
push de
ld e, lx
ld d, hx
pop ixZ80 QuestionCan the instruction EX DE,HL be prefixed with DD to give EX DE,IX? Derek
Push and Pop
is that like peek and pokeZ80 QuestionCan the instruction EX DE,HL be prefixed with DD to give EX DE,IX? Derek
... /> i prefer this :)
push de
ld e, lx ...
ld d, hx
pop ix
[/quote]
push de
defb #dd
ld d, h
pop ixProgramming MC challengeIn the 80-ies I got the following assignment for a programming course. 2 16-bit values stored in #8000 and #8002 must be added together and stored i…
Programming MC challengeIn the 80-ies I got the following assignment for a programming course. 2 16-bit values stored in #8000 and #8002 must be added together and stored i…
z88dk+splib2 sprites question.I'm creating a game and I have several "states" for my main sprite, such as jump, facing left, facing right, etcetera. All those states require a dif…
... de, (destino)
uncrunch:
push de ; destination pointer to 2nd ... register
exx ; set
pop de
; El jussi ... tocarlos.
push hl
push de
push bc
push af
z88dk+splib2 sprites question.I'm creating a game and I have several "states" for my main sprite, such as jump, facing left, facing right, etcetera. All those states require a dif…
... for symbol
push hl
exx
pop hl ; hl = decoder ... b,a
.writeloop
pop af
ld a,c ... /> cp h
.foundchild
push af ; save: nz = right child ...MC TipPlace your MC tip here: Here is my first: When using alternate registers (EXX) the HL register must not be affected on return to BASIC. Also the IY…
... ]
And what about PUSH HL & POP HL ? :DOptimisation Needed! Is this the Fastest way to copy bytes from screen and back again?I have the screen address (say 0,0 i.e 16384) I want to copy 4 bytes wide by 32 bytes high from the screen to an area of memory. I then want to cop…
[code]
pop bc
... ex de, hl
pop hl
ld (memory1), ... hl
pop hl
ld (memory2), ... and just one thing: POP BC/LD (HL),C/INC ... POP HL
INC H
...
...
PUSH ...ROM paging questionAssuming the Spectrum 128 memory map and port addresses, but two custom ROMs in place of the normal Editor and BASIC, what is the most efficient way …
... routine:
[code]
RST_START POP HL ; Fetch RET Address
INC HL
PUSH HL : save RET Address after ...ROM paging questionAssuming the Spectrum 128 memory map and port addresses, but two custom ROMs in place of the normal Editor and BASIC, what is the most efficient way …
... address in HL
pop HL
; get ... stack
push HL
; push after_page2: on stack
push HL
; push call address on ... RET, effectively this will POP PC and hence call our ...Machine Code: quicksort optimisationI came across this z80 quicksort implementation when going through the wikipedia article on the same. It's 44 bytes long. I was wondering if any of …
... qsort ld hl,0
push hl
qsloop ld h ... /> ld (de),a
pop hl ;restore pivot
jp ... ;restore pivot
pop hl ;pop lo
push bc ;stack=left-hi ...
