... 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 ...

... )
IF FLAG IS 1, FAST COPY BUFFER TO SCREEN

POP BC
LD SP,HL
PUSH BC
PUSH DE
PUSH ...

... problem is if I omit push and pop bc the thing goes ... )
;push bc
call flash
call flash2
;pop bc ...

... interests me most is efficient fast code, so after weeks of ... the stack pointer and using push/pop to copy memory fully unrolled with ...

... 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 ...

... 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 ...

... 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 ...

... 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 ...

... 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 ...

... 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 < ...

... 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 ...

... 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 ...

[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 ...

... 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.

... 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.

... counter-example might be buffer copy routines (floating execution window due ... loops or beeper routines in fast memory at all times. On ... space in there; an occassional PUSH/POP woudln't hurt.

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?

...
;; data
push de ; save destination pointer
push hl ; save a copy
;; (does ... pointer
ldir ; copy bytes
pop hl ; restore source ...

... (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 ...

... code but not very fast. The PUSH/CALL/RET/POP is way too ... rtunes ;o) and is quite fast; the slowness of the routine ... come up with some new fast algorithm for drawing a line ...

fast vertical scrolling:

...

next_line: pop de
pop hl

ldi ... />
moving memory by push pop takes about a litlle less ... hl
...

pop hl
ld (nnnn-6142 ...

... 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 ...

That PUSH/POP routine is how I do ... on shifting bytes around as fast as possible. I've never ... that aren't possible with PUSH/POP, so if there is a ...

... /> POP BC
LD SP,HL
PUSH BC
PUSH DE
PUSH ... down the copy. I would drop using AF' for push/pop and have ...

... the top 16 rows using fast push/pop sp functionality for transfer

... 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 ...

... the push/pop block should be:

[code]
;end of copy ...

... 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 ...

... 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 ...

... even if you don't push & pop any register, the stack ... the middle of the big copy routine and manually call the ...