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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 ... as part of the third block, which is an advantage - I ... -
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 ... so we can see how fast it is. If this isn ... 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…
... 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 ... /> 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…
... 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 ... program to generate this code block! Or perhaps this is created ... things go as fast as possible (or acceptably fast) and things ... -
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 ... the division first making it fast without register restriction. That's ... -
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 ... -
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 ... -
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…
... running outside the di/ei block and it needs to have ... the push/pop block should be:
[code]
;end of copy block
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 ...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 ...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 < ...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 ...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 ...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 ...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 ...Relocation with SDCCI desperately need auto- relocation with SDCC. Something that will compile all of my code using start address 0 and generate relocation table so that…
... access is then done with push/pop pairs. A variable on ... read/written with a single push/pop pair that consumes 2 bytes ... same in its balloc library (block memory allocator) but it operates ... . Today, large caches and fast processors have made it possible ...Relocation with SDCCI desperately need auto- relocation with SDCC. Something that will compile all of my code using start address 0 and generate relocation table so that…
... frequently accessed ones use the push/pop method. The two are not ... the code for the innermost block -- the block that gets executed the ... produce something fast. Then I move to the enclosing block and write ... , etc. At the function block level I have a register ...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 ...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.
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 ...
