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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 ... -
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 ... -
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…
Machine 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 is one of quickest methods, faster then e.g using ldir or writing a loop.
Is it true? -
LZ4 decoderI encountered the [URL="http://code.google.com/p/lz4/"]LZ4 compressor[/URL] a few weeks ago. Reading the [URL="http://fastcompression.blogspot.co.uk…
...
;; data
push de ; save destination pointer
push hl ; save a copy
;; (does ... pointer
ldir ; copy bytes
pop hl ; restore source ... -
ZXSCLZF - Yet another Screen CompressorQuick disclaimer before I continue, this compressor does not shrink screens as small as some of the others posted here, in particular the very good z…
... (good for cut scenes, pop ups etc...). It scans ...
(*store_l++)=*buffer_ss; // copy first literal into literal store ... memory position to start the copy
push hl ; 11t - store ... copy b times
;;
;; clean up before loop
pop ... -
[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…
... the stack pointer and using push/pop to copy memory fully unrolled with ... -
whats your second favourite retro computerOk i'm going to assume that for most of us here the speccy is our favourite number 1 retro computer,its the best home computer in the world etc etc :…
... byte to perform the copy and occupies 1.5 ... copied. Oddly enough, inserting "push/pop ix/iy" in there ... br /> If I were to copy a Spectrum screen (6912) the ... figure) so it could copy approximately 5714 bytes in ... and 1MHz, able to copy about 2048 bytes, I ... -
Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... /> POP BC
LD SP,HL
PUSH BC
PUSH DE
PUSH ... down the copy. I would drop using AF' for push/pop and have ... -
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 slows ... support) is a fast byte copy (for copying a back buffer ... possible to do the byte copy at a speed of 13 ... (not the same as a copy, more limited) at about 5 ... -
How do I clear only a specific area of a screen (quickly) in machine code ?I'm looking for a machine code routine which will clear the first 20 rows of the Spectrum's display (or any number of rows or columns) . I have found…
... LD B,8
PUSH HL ; Remember address of ...
oneLineLoop
PUSH BC ; Remember counter
LD ... get HL back by PUSH/POP and then INC ... different from the ROM COPY routine - not sure ... -
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…
... = destination address for pixel row copy
ld h,d ; ... /> push hl
ldi x 32 ; repeat ldi 32 times to copy ... address for next pixel row copy
jp pe, ... pixel, or moving to a push/pop solution.
BTW, ... -
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…
... each in comparison to regular push/pop). The "ld sp,hl; ld ... the row in the next copy operation.
The destination ... be done for the next copy operation as the stack is ... -
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…
... I took out the push ix/pop ix pair because ... want to put that push ix/pop ix back to ... do copy operations in pixel row order easily. push ix/pop ... for regular push/pop and will decrease the copy speed from ... $5800, the first push operation actually writes data ... -
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…
... the push/pop block should be:
[code]
;end of copy ... -
Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.
... of destination area, and use PUSH and POP with all registers (including ... LDIR, but much slower than PUSH/POP is to use a amount ... example 32 of them to copy a line) in series. You ... -
Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.
... stored in this sequence
push hl
...
... .xx T/byte
PUSH/POP in theory 10.5 T ... some kind of really fast copy routine, the fastest i ... )
LD HL, xx / PUSH HL 10.5 T/byte ... was example of very fast push/pop copy routine. he uses it ... -
Brand new River Raid remake?one of my friend is trying to make a riverraid remake on flash just to have fun, I checked zx spectrum port of river raid. it is bad, really bad, jer…
... SP,nn" and all the POP / PUSH instructions for every line of ... )
then use loooooong push/pop/ld sp code to write ... it (i'm not saying copy it just check it sometimes ... -
SP and IM2 woesI have a function that writes the backbuffer to the screen using the method by which SP is stored, I "POP" a load of registers and then chnge SP to t…
... even if you don't push & pop any register, the stack ... the middle of the big copy routine and manually call 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…
... code, doesn't use PUSH/POP copy, uses LDIR, uses pre ... )
inc hl
push de
djnz FillScrLinesRev
ScrollDownLoop: ;copy a single char line
push bc
ld ... br /> inc d
pop bc
djnz ScrollDownLoop < ... -
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 ... -
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…
... inner loop to remove the push / pop of hl that would be ...
REPT 8
; copy data
ld a, (bc ... source and destination address
pop hl
ld e, l ...
REPT 8
; copy data
ld a, (hl ... -
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 ... -
Games only possible in 128K mode?In the thread: [url]http://www.worldofspectrum.org/forums/showthread.php?t=30145[/url] the discussion of 128K only games comes up, and it made me w…
... of Beepola's assembly output (PUSH POP BC so drums work). I ... need the original game to copy the correct patterns of falling ... -
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 ... -
Best way for programming in BASIC?New to the ZX Spectrum, and fixing up ccowley's vbSpec emulator. Aside from that, I would also like to try programming a game or two in BASIC. What's…
... . Disk and file commands (CAT/COPY/MOVE/ERASE/RENAME)
2 ... at feasibility of using INCLUDE, PUSH/POP on the call stack)
COPY command to use them
PUSH/STACK POP to add/remove values)
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 ...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 ...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 ...
