-
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 ... as part of the third block, which is an advantage - I ... -
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 ... -
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…
...
oneLineLoop
PUSH BC ; Remember counter
... get HL back by PUSH/POP and then INC ... different from the ROM COPY routine - not sure ... we're in the same block
... to move to the next block.
... -
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 ; now ... pixel, or moving to a push/pop solution.
BTW, everything ... ..7) character row within a block
CCCCC = (0..31) character ... -
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 ... be done for the next copy operation as the stack is ... /> push de
push bc
push af
; repeat this could block ... -
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 ... do copy operations in pixel row order easily. push ix/pop ... for regular push/pop and will decrease the copy speed from ... of the 16-byte block where you want to ... to generate this code block! Or perhaps this 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…
... running outside the di/ei block and it needs to have ... the push/pop block should be:
[code]
;end of copy block
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…
... less than current location
push bc
call GetLineAddrOne ;source ...
pop bc
jr LineScrolledUp
ScrollUpLastLineInScreen
push bc ... 64, therefore not first in block
;copy line from location "(7 ...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 ... *24 ; byte count
ldir ; block copy
; set the attributes ... )
pop hl
pop de
pop bc
pop af ; restore ...Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…
... something like:
[code]
pop hl - each tile starting address ... use any of the block copy operations or even PUSH to the display ... .[/QUOTE]
I can use PUSH as easy as i can ...Fantasy Z80 instructions?This follows on from something catmeows said in another thread, and that I've been meaning to ask for a while. This may sound daft to people with mo…
... ,(nn) LD (nn),rr
PUSH rr POP rr
8 ... JR cc,nn
Block Copy/Etc
--------------
{LD,CP ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... pointers
push ix ; copy IX
pop de ; to ... ld_bytes ; LOAD a data block
ret c ; ... a, 0xff ; signal data block
jp ld_block ; immediate ... a, 0xff ; signal data block
jp ld_block ; immediate ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... pop bc ; unstack byte count
ldir ; block copy ... push bc ; push ...Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…
... one was a random block effort done in ... /> REV1:
push hl
push bc
ld ... de),a ;and copy
NO2:
pop bc
... br />
pop bc
pop hl
ld ...Simple text scroller, first character problemin a text scroller, whole line scrolled to the left by 1 pixels using RL(HL) ; DEC L method. But at the rightmost character must be printed immediate…
... you can just do a block copy from the font data into ... b,8
loop:
push hl
ex de ... l
endm
pop hl
inc h ; down ...Help for beginner with z80Hi chaps, I'm reasonably new with z80, but had a fair amount of experience with 68000, so decided to give a few things a go. One little thing I'm t…
... /> ADD HL,BC
; copy the character letter to the ... ),255 ; colour of the white block
INC HL
DEC DE ; PUSH / POP in the correct place)
Help needed with MIA software with custom (?) loaderHi, I've got into my hands recently a bunch of Polish educational software which are unknown MIA on WOS. I believe they are protected with some…
... for saving a master copy (from BASIC LINE 4 ... RET for saving the master copy and later restored
0xEAE9 PUSH HL ; Push return adress (ROM)
block'
M2: 0xEB6A POP DE ; Get ...Running out of fingers in AssemblyDear all, Still trying to learn Assembly and have put a few routines together. However, as my routines become a little more involved I find myself…
... note of special architectural features (block copy, block io, separation of io and ... nc, error_einval_zc
push de
pop ix
; use ... of digits
push ix
pop hl
write_lp ...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 ...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 ...
