-
Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.
... stored in this sequence
push hl
...
PUSH/POP in theory 10.5 T ... has some kind of really fast copy routine, the fastest i ... /> LD HL, xx / PUSH HL 10.5 T/byte ... it was example of very fast push/pop copy routine. he uses it ... -
Push/Pop data copyingWe all know that stack pointer cheese and push/pop is faster to move data than LDIR - which in turn is slower than unrolled LDI's anyway. I rewrote …
... that stack pointer cheese and push/pop is faster to move data ... mojon's fourspriter to use push/pop, but copying a four character ... screen takes three cycles of push/pop.
What's the ... -
Character scrollingOk, first I'd like to say that I'm not looking for a complete routine (but that might help) because I am hoping to write it myself and learn a bit mo…
... fast. It's self modifying code, doesn't use PUSH/POP copy, ... )
inc hl
push de
djnz FillScrLinesRev
ScrollDownLoop: ;copy a single char line
push bc
ld ... br /> inc d
pop bc
djnz ScrollDownLoop < ... -
Exilei\'m sure this has been brought up before but couldn't find a thread in 'New Game Ideas'. Why did the Spectrum never get a port of the BBC game Exile…
[QUOTE=Fikee;613293]PUSH/POP copy with bank switch between fetch ... in the middle of each copy. It slows you down, but ... routine.
For my super-fast scroller, you treat the tiles ... -
Sprite Graphics TutorialHi everyone, Would like some feedback on the following: I am thinking of writing a Sprite Graphics Tutorial, ie. how to best program and implement …
... the top 16 rows using fast push/pop sp functionality for transfer
Help fix this keyboard read program?This code runs in an interrupt routine with DI. What would be the simplest way of making it so it doesn't auto repeat a keypress? [code]keys: ld a…
... /> always make laugh comparing tight PUSH-POP copy routine with manic miner's ...Help fix this keyboard read program?This code runs in an interrupt routine with DI. What would be the simplest way of making it so it doesn't auto repeat a keypress? [code]keys: ld a…
... ]always make laugh comparing tight PUSH-POP copy routine with manic miner's ...shifting spriteshi. have anyone experience with shifting sprites by table ? some neat tricks ? i don't want to see complete code (really don't want, it trashes thr…
... before I heard about the push/pop "copy 2 bytes at once" trick ...Using the stack to copy memory blocksA [b]PUSH[/b] and a [b]POP[/b] instruction together take less time than two [b]LDI[/b], so long [b]POP/PUSH[/b] sequences are sometimes used to copy …
... m asking about optimising a push/pop byte copier that uses ... have gasman's example of push/pop copy used for multicolor or ... my description of push/pop copier from CHASE H. ... br />
when speaking about PUSH/POP copy don't forgot contetion (and ...Push/Pop data copyingWe all know that stack pointer cheese and push/pop is faster to move data than LDIR - which in turn is slower than unrolled LDI's anyway. I rewrote …
... the same speed as a PUSH/POP copy. But there is no LD ...Push/Pop data copyingWe all know that stack pointer cheese and push/pop is faster to move data than LDIR - which in turn is slower than unrolled LDI's anyway. I rewrote …
... the same speed as a PUSH/POP copy. But there is no ... ld sp,screen+0x0020
push hl ; 4T lost to ... push hl
push de
push bc
exx
push hl
push ... de
push ...Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…
... /> pop hl
ld sp,hl
push bc
push de ... push de
push hl
sp2:ld sp,0
pop ... hl
pop ... you get real benefit from push/pop copy.Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…
... expect the code for different copy widths could be quite different ... you get real benefit from push/pop copy.[/QUOTE]
Won't the ...Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…
... you get real benefit from push/pop copy.[/QUOTE]
Won't ... ). So the main benefit from push/pop copy will be outside of contention ...Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…
... ). So the main benefit from push/pop copy will be outside of contention ... between the blocks of LDIs/PUSH/POP instructions! Though I did measure ...Exilei\'m sure this has been brought up before but couldn't find a thread in 'New Game Ideas'. Why did the Spectrum never get a port of the BBC game Exile…
... ]Hysteria[/I].
[/QUOTE]
PUSH/POP copy with bank switch between fetch ...Byte-order backbufferThis is a tool for Z80 coders who wish the Spectrum screen had a serial layout. It runs as an interrupt mode 2 service routine and uses POP and PUSH …
... service routine and uses POP and PUSH to copy the
contents of ... Spectrum screen order and copy it as fast as
possible. Well ... /> push af
push bc
push de
push hl
push ix
push ...Trouble with rainbow effect push/popI'm having a bit of bother getting my rainbow graphics to behave themselves. Basically I want a rainbow effect to last for say 4 seconds before movi…
... problem is if I omit push and pop bc the thing goes ... )
;push bc
call flash
call flash2
;pop bc ...[Asm] Is this nested loop faster than LDIR or a bunch of unrolled LDI's?Hi all. I'm learning Z80 asm on Speccy 48K, and to start with I decided to write my own "CLS" routine (without relying on ROM calls or LDIR) as a lea…
... interests me most is efficient fast code, so after weeks of ... the stack pointer and using push/pop to copy memory fully unrolled with ...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. …
... pretty fast stack based copy routine:
LD SP, HL
POP ... :)
PUSH IY
PUSH IX
PUSH BC
PUSH DE
PUSH AF ...
EXX
PUSH BC
PUSH DE
PUSH AF
INC ...The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…
... s implementation has an unnecessary push/pop in there which really ... hw support) is a fast byte copy (for copying a back ... the main display) and a fast write/clear (for zeroing ... to do the byte copy at a speed of ... (not the same as a copy, more limited) at about ...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…
... on the z80 is with push and pop. So the fastest scroll ... = destination address for pixel row copy
ld h,d ; now ... so we can see how fast it is. If this isn ... pixel, or moving to a push/pop solution.
BTW, everything ...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…
... to a list of how fast the instructions in mc are ... each in comparison to regular push/pop). The "ld sp,hl; ld ... the row in the next copy operation.
The destination ...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…
... notice I took out the push ix/pop ix pair because this ... can do copy operations in pixel row order easily. push ix/pop ix ... 21 for regular push/pop and will decrease the copy speed from 12 ... things go as fast as possible (or acceptably fast) and things should ...50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... the other thread on using PUSH to do scrolling. It's ... using POP/PUSH to copy data, and how Joffa's scrolling was so fast ... is replacing the sequences of PUSH statements in the main drawing ...Your Views on... GhostbustersI dusted off the Master System version of this and inspired me to try out the Speccy version. It's a good game with it's strong and weak points. I …
... does a big LDIR to copy it to the screen. Unfortunately ... up by using LDI or PUSH/POP. To fit in the small ... /> DJNZ DONE2
JP $8300 ;fast loader jumps to $8300 to ...Your Views on... GhostbustersI dusted off the Master System version of this and inspired me to try out the Speccy version. It's a good game with it's strong and weak points. I …
... does a big LDIR to copy it to the screen. Unfortunately ... up by using LDI or PUSH/POP. To fit in the small ... /> DJNZ DONE2
JP $8300 ;fast loader jumps to $8300 to ...Byte-order backbufferThis is a tool for Z80 coders who wish the Spectrum screen had a serial layout. It runs as an interrupt mode 2 service routine and uses POP and PUSH …
... service routine and uses POP and PUSH to copy the
contents of ... Spectrum screen order and copy it as fast as
possible. Well ... /> push af
push bc
push de
push hl
push ix
push ...SpritesYes yes, I know this has been hashed over plenty of times before, but... I have knocked up a quick tiling routine which works with my back buffer co…
... seconds - I thought it was fast enough.
... buffer
copy the 3 tile graphics needed ... tile buffer,
copy ORing/ANDing the sprites onto ... those tiles
copy the tile buffer numbers ... joy of EXX instead of PUSH/POP.
SpritesYes yes, I know this has been hashed over plenty of times before, but... I have knocked up a quick tiling routine which works with my back buffer co…
... seconds - I thought it was fast enough.
... buffer
copy the 3 tile graphics needed ... tile buffer,
copy ORing/ANDing the sprites onto ... those tiles
copy the tile buffer numbers ... joy of EXX instead of PUSH/POP.
