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Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…
... example I mentioned (copying from buffer to screen), clearly code ... LDI is still preferable to PUSH though, like when you're ... together in your buffer? In this case, the buffer would store ... referencing the corresponding pair in buffer address. In this case, the ... -
NEW GAME: Elixir VitaeOnly 2 weeks after Janosik I have a pleasure to announce my next creation - a logical minigame called [B]Elixir Vitae[/B]. Just like another Polish …
... a customised unrolled PUSH/POP colour routine from a buffer. Then you ... ),HL. Then set SP and push the other six registers to ... -
NEW GAME: Elixir VitaeOnly 2 weeks after Janosik I have a pleasure to announce my next creation - a logical minigame called [B]Elixir Vitae[/B]. Just like another Polish …
... definition without even using a buffer.
If ... br /> ; 16035T
PUSH BC ; columns 15 and ... br /> ; 16046T
PUSH DE ; columns 13 and ... EXX
; 16077T
PUSH BC ; columns 11 and 12 ... -
z88dk and im2I set up a minimal IM2 mode so I can draw sprites for a laff [code] #include <string.h> #include <stdio.h> #include <im2.h> #include <stdlib.h> #in…
...
push af
push bc
push de
push hl
buffer
54 ; d1f7 - d1fe SP1 ... .LIB pixel buffer
55 ; d1ed - d1f6 SP1 ... -
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…
... de, mem_2_4 ; temporary buffer
push hl ; stack line number ... /> ln_to_str:
push de ; store buffer address
ld ... (de), a ; store in buffer
inc de ; point ... (de), a ; store in buffer
inc de ; next ... -
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…
... /> call scrl_bfr ; scroll the buffer
.endif
. ... de ; add offset
push hl ; stack it
... -
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…
... /> ld hl, palbuf ; address palette buffer
org 0x0bf0
push bc ; stack line and column ... -
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…
... ; alternate register set
push de ; stack DE'
... detokenizer_5:
push de ; store edit buffer destination
... -
FZX Driver for z88dkAn fzx library for z88dk can be downloaded [URL="https://drive.google.com/file/d/0B6XhJJ33xpOWM2hWNjAxMVkxaEk/edit?usp=sharing"]here[/URL]. The libr…
... a version), anything trying to push the spectrum in a modern ... fzx text into a back buffer and then make that part ... -
Documentation for SP1 for Z88DK?(I was going to post in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=11729"]the other thread[/URL], so if a mod thinks this should go…
... d1ff - d1ff SP1.LIB attribute buffer
54 ; d1f7 - d1fe ... SP1.LIB pixel buffer
55 ; d1ed - ... asm
push af
push bc
push de
push hl
my_asm_isr_2:
push hl
ld hl ... -
Cross platform developmentI'm just vaguely considering supporting a few more retro 8 bit platforms for something I have in mind to do. Just Z80 and 6502 really, but that cove…
... to the ascii buffer and zero terminate the buffer
; ... 16); // write hex number to buffer
The generated ... br /> ld hl,1234
push hl
ld hl,buf ...
push hl
ld hl,16 ...
push h;
call itoa_callee
bit manipulation conundrumWhat's a neat way to change this bit pattern in registers BCDE: [code]Loop0: ;change B:00000000 C:abcdefgh D:ijklmnop E:qrstuvwx[/code] to this bit …
... source buffer for more consistent access across the bytes
push ix ... caller
Get3to4:
push bc ; store the loop counter ...Documentation for SP1 for Z88DK?(I was going to post in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=11729"]the other thread[/URL], so if a mod thinks this should go…
... integer
; de = char *buffer
; carry set to write ... ld bc,-10+256
push bc
inc ... ld bc,-100+256
push bc
ld ... bc,-1000+256
push bc
ld ...Pac-Land: can be coloured?All versions of this game are full coloured, but not the Spectrum version. It has large sprites, but maybe the scroll is too fine to make a coloured …
... /> LD H,0
PUSH HL
PUSH DE
LD ... used as atribute buffer
;easy calculation: tile buffer starts at 23296 ... br /> ;change copy tiles to buffer in loop code
; ... /> ;change copy single tile to buffer code
;jumps here from ...ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... , memory stream, etc) and then push a decompress filter in front ... zx7, I'd like to push it in front a memory ... is it a fixed size buffer? If that is the case ...Using the stack to blit bufferI was using a ldir to blit my back buffer to the screen RAM, and it was working pretty well if not rather slow. After reading about using the stack …
...
di
ld sp, buffer
pop af
pop ... /> ld sp, screen+18
push hl
pop de etc ...Using the stack to blit bufferI was using a ldir to blit my back buffer to the screen RAM, and it was working pretty well if not rather slow. After reading about using the stack …
He gave me them, so technically a refund isn't required.
As for blitting, it is also used to draw sprites to a 'buffer' screen. Maybe we are using the wrong terminology. Maybe the Pop/Push method should be called 'Plitting' :-)Using the stack to blit bufferI was using a ldir to blit my back buffer to the screen RAM, and it was working pretty well if not rather slow. After reading about using the stack …
... to draw sprites to a 'buffer' screen. Maybe we are using ... wrong terminology. Maybe the Pop/Push method should be called 'Plitting ...writing incrementally to tape without leadersI want to be able to write intermittently & incrementally to some sequential medium which is supported on any Spectrum (emulator, ie. tape); eg. [cod…
... code]LD HL,#053F
PUSH HL
LD HL,0 ... chunk of data when the buffer is full.
OUTPUT LD DE,buffer
LD HL,(OFFSET ... /> LD (OFFSET),A ; Zero buffer
RET
OFFSET ... DEFB 0
BUFFER DEFS 128[/code]
< ...What is this Nirvana engine?Ive been trying to look for a thread on this but cant seem to locate one. I downloaded a spanish game called El Stompo that uses this engine which ha…
... +[/I] uses the POP/PUSH technique to give you 16 ... simple attribute buffer. The ZXodus Engine uses the LD/PUSH technique to ... with the instructions, a simple buffer is impossible. This is why ... deal directly with the attribute buffer.
The Bifrost* ...Interface 1bis updateSupport for connecting a standard PC keyboard to the interface?s PS/2 socket, in place of a mouse, has been added. The external keyboard?s output is …
... 0083 = PB_CLR EQU #83; Discard buffer contents
;
; System ... ;
3874 : f5 PR_CMD PUSH AF; Save character.
3875 ...Interface 1bis updateSupport for connecting a standard PC keyboard to the interface?s PS/2 socket, in place of a mouse, has been added. The external keyboard?s output is …
... /> 0083 = PB_CLR EQU #83; Discard buffer contents
;
; System ... BREAK pressed!
38ad : f5 PUSH AF
38ae : cd7438 CALL ...Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…
So, your screen buffer is in linear order instead ... want it to go, and PUSH all those registers (in reverse ... fetches a value from memory; PUSH moves the stack pointer plus ... /> Also, don't forget this buffer screen can be bigger than ...Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…
... Editor)
;
; Transfer back buffer screen to main spectrum screen ... c, 1
loop:
push bc
ld a, c ... e, 0
next_screen_line:
push de ; save the loop counter ... for now
push bc ; save the coords
Optimal shifting for set pixel?Hi, I'm optimizing my set pixel code. For speed. But without using partitioned memory (i.e. a table on 256 byte boundary) I have optimal memory addr…
... is used to calculate display buffer memory offset, it's going ... /> ;DE=Y.X
PLOT PUSH HL,BC:LD H,HIGH ...FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…
... /> _rs232_buffered_input::
di
;; buffer to hl
ld iy ... h,3(iy)
push hl ; store original buffer
;; initial ... /> result rs232_getb(byte *b) {
/* buffer empty */
if (rs232_ib_beg==rs232_ib_end ...FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…
... /> ;; buffer to hl
pop af
pop hl
push hl ... br /> extern word rs232_buffered_input(byte* buffer) __naked;
extern result rs232_getb ... /> result rs232_getb(byte *b) {
/* buffer empty */
if (rs232_ib_beg==rs232_ib_end ...Buffer to screen - how much?[FONT=Calibri][SIZE=3]I am starting to build a new game and am researching different ways to accomplish what I need to do. My question is, is it poss…
... is the stack PUSHing the buffer to screen behind the scan ... .
I put the buffer at 49152, then you can ... between the corresponding screen & buffer addresses just by toggling bit ... or PUSH ([I]or even LDIR dare I say!) [/I]your buffer ...
