-
New assember ideaAs i work with Eclipse IDE in my job i become more and more lazy. This leads me to idea that it is time to left Notepad+Tasm combo behind and move on…
... /> .sbrk_callee
pop hl
pop bc
ex (sp ... /> pop af
pop bc
pop hl
pop de
push af ... /> .sbrk_callee
pop hl
pop bc
ex (sp ... run out of memory fast. And hence why ... -
help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
...
push bc ;save line counter
dontmove ;copy line2, no ... copied into de
pop hl ;load byte to ... a char boundary
pop de ;load posn to ... line road right
pop hl ;get ready to ... line road left
pop bc ;recover count for ... -
help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
[quote=bigjon;250417]Don't we need both to copy a byte, hence 21 cycles per byte not 10.5?[/quote]
Yes, but you are copying 2 bytes with one pair of instruction POP/PUSH, thus 21/2 = 10.5 -
help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... /> pop bc
pop de
pop hl
exx
pop bc
pop ... /> push hl
push de
push bc
push af
;end of copy ... -
IF2 Rom snapshot creationHi, is it possible convert a Speccy 16k snapshot to a Interface 2 Rom file? I've the original Ultimate Pssst, Cookie, Trans-am and Jetpac tapes and …
... /> POP BC
POP HL ;restore values
PUSH HL ;push it ... LD BC,$0009
LDIR ;copy starting bit of relocation code ... LD BC,$000A
LDIR ;copy across code to decompress screen ... relocator code
3D00-3FFF - copy of character set from ZX ... -
Spectrum AssemblyHi All, Thanks for letting me in... lol Over the last couple of days I started playing my spectrum emu again and then I started thinking about lear…
... 's the outline for a fast full screen vertical scroll:
add ix, de
nextln: push af
ld a, (x_off ... ix
inc ix
pop af
dec a
Spectrum AssemblyHi All, Thanks for letting me in... lol Over the last couple of days I started playing my spectrum emu again and then I started thinking about lear…
... 's the outline for a fast full screen vertical scroll:
POP HL: POP DE: LDIx32: POP HL: POP DE and so ... /> add ix, de
nextln: push af
ld a, (x_off ... ix
inc ix
pop af
dec a
Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.
... data in register pair and PUSH it into screen buffer) ... .
Typical PUSH-filler code, 16.5t per ... l
push de[/code]
In POP-reading case ... you can store second copy of whole source data in ... used not only to copy large linear blocks of ...RGB on speccy ?hi, just a question : are you aware of scene demo trying emulate rgb ? i was a bit ill last few days so laying in bad i come with a (stupid ?) idea.…
... copy bytes around, and even the fastest way of doing that (POP ... into every available register including the alternates, then PUSH them ...ZX Spectrum (16K) sound/beepHi all, I think I'm in right place now, I've tried to find an answer how to generate two channel sound using ZX Spectrum 16K. Only think I've found …
... break: LD A,(work3) ; Copy decay rate to decay count ... br /> LD A,(work5) ; Copy attack rate to attack count ... program.
subr: PUSH BC ; Start of subroutine. Save ... LD (work2),A
labl5: POP BC ; Restore BC
...A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…
... ZX screen
; Copy them in reverse order< ... pop bc
jr LineScrolledUp
ScrollUpLastLineInScreen
push ... ZX screen
; Copy them in forward order< ... in block
;copy line from location "(7 ...BASin r14d - Final bugfix for the r14 seriesOk, there's not a great deal to "show" here, as most of the work has been going on "under the hood" so to speak. And there's been a [i]lot[/i] of wor…
... /> PUSH HL
LD BC, 32 ; Copy 1 line
LDIR
POP ... HL ; Restore HL
PUSH HL ... line in display file
POP DE ; Restore last HL into ...Help to run Abu Simbel in a +2A SpectrumI bought this game some weeks ago, but the version is the old one. When I loaded it in the emulator, I had to switch the keyboard issue to 48Kissue.…
... ld bc,keyscan_size
ldir ; copy 'keyscan_code' to highest possible memory ... ; preserve HL, BC
push hl
pop ix
ld de ...Fastest Block Drawing Code?Following on from my scrolling thread [URL="http://www.worldofspectrum.org/forums/showthread.php?p=351304#post351304"](http://www.worldofspectrum.org…
... lot easier.
Then, copy each line of the screen ... buffer bigger, so you can copy a full screen out of ... sceen address table and use POP to read off the screen ... line. Just remember not to PUSH or POP anything, and to set ...Fastest Block Drawing Code?Following on from my scrolling thread [URL="http://www.worldofspectrum.org/forums/showthread.php?p=351304#post351304"](http://www.worldofspectrum.org…
... .
Also, the POP screen address and 28 LDI ... easier.
Then, copy each line of the screen ... bigger, so you can copy a full screen out of ... address table and use POP to read off the ... . Just remember not to PUSH or POP anything, and to set ...Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …
... /> push af
push bc
push de
push hl
push ix
push ... /> nop
nop
; copy the colours
REPT 24 ... /> pop iy
pop ix
pop hl
pop de
pop bc
pop ...Tips on optimizing some newbie assembly routinesI'm starting to learn some assembly language. The best way to learn is to actually code something you are going to use, so I'm creating a very simple…
... think it will render fast enough to avoid tearing, ... ; loop for 256 cells
push bc
[... inner ... Next cell...
pop hl
pop bc
ld a ...DivIDE QuestionHi all, I've been trying to work out how the DivIDE works and after reading and re-reading the DivIDE programming model document by Zilog I think it…
... 102(#66) and read instrustion PUSH AF
2) at adress ... your NMI code.
3) push registers to stack + your NMI ... NMI to 48rom you must pop all registers + jump to "map ... />
- ZX font you can copy from 48rom to DivIDE ram ...When would you use LD A,R ?Can anyone tell me a practical use of LD A,R and LD R,A I am confused when you would need to use it? Cheers
[QUOTE=Metalbrain;399421]Fast flag using bit 7 (that ... ...
;****************************************
Interrupt:
push af
ld a ... ; change current beeper routine
pop hl
ld a,(hl ...Machine Code Microdrive File LoaderI've been experimenting with transferring games to run from microdrive. Typically I like to see a loading screen while things are happening, and I li…
... ; fetch current error return
push hl ; and preserve
;< ... ),sp
; push hl ; preserve hook31
; pop bc ; and restore ... -rom1tab ; how many jumps to copy
ldir
;
... optempm
;
push ix
pop hl
add hl ...Memory concerns with z88dkI've retaken my old spectrum project and sadly I've reached a dead end very fast. I'll try to explain my worst problem in a few lines. I'm not a vet…
... the extra rampages and then copy what is needed for the ...
push af
push bc
push de
push hl
pop hl
pop de
pop bc
pop af
What Z80 development tools do you use? What books?Hi. I've been meaning to do it for over 25 years, but.. better late than never :) I'm starting to learn machine code and am trying to get a developme…
... bc with a
push af ;push a out of way for ... /> rst 10h ;print Return
pop af ;get back a
pop hl
ld a,(hl)
inc hl
push hl ... be just so ultra-fast? Perhaps even too fast? But, as I ...What Z80 development tools do you use? What books?Hi. I've been meaning to do it for over 25 years, but.. better late than never :) I'm starting to learn machine code and am trying to get a developme…
... bc with a
push af ;push a out of way for ... /> rst 10h ;print Return
pop af ;get back a
fast? Perhaps even too fast? But, as I ...Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…
... /> isr: push af
push bc
push de
push hl ; save ... />
REPT 8
; copy data
ld a, (hl ... ; byte count
ldir ; block copy
; set the ... />
pop hl
pop de
pop bc
pop af ; restore ...Easy way to print text in machine code?Please? It sounds so simple, but I've never done it. At the moment I'm grabbing the start address for each letter then printing them out one at a t…
... text
text2
push hl
ld h, 0 ... /> inc d
djnz text3 ;copy 8 bytes of char gfx ... it into attr memory
pop hl ;restore pointer for next ...'Hello World' in ASM ?Can someone show how to make the classic 'Hello World' print with ASM code ? I cant figure at this moment how to insert and handle strings with the s…
... use can look like this (fast output with unrolled loop, not ...
printChr
push hl
push de
ex de ...
org $-2
pop de
pop hl
inc l ...Hi Res Print Routine neededHas anyone seen code for a print routine with pixel accuracy? That is print(y,x,CHAR) that allows 0 < y < 192 and 0 < x < 255 - that takes a charact…
... in the pipeline - like a fast 2X2 tiles routine, based on ... revamped for speed to use push and pop (and it's 95 ...Sprite MaskingI was looking at the sprites in some games, and noticed they have sprite followed by mask. Usually a row at a time (so the mask is sort of interleave…
... as fast as setting the stack pointer and using push and pop, as ...
