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LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…
... /> My program will have the LDIR instruction in non-contended memory ... to the duration of a LDIR instruction (normally 21T) means ... that when LDIR synchronises with the gaps in ... per byte.
Using LDIR to scroll the full screen ... -
Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…
... long time that uses an LDIR instruction to move the screen ... -
Quickest way to fill the attributes using LDIRI'm looking for a small routine to fill the entire attribute area of the memory with a single value, I've used LDIR in the past, but forgotten how to…
I'm looking for a small routine to fill the entire attribute area of the memory with a single value, I've used LDIR in the past, but forgotten how to do it... :confused: -
Addressing mode of LDIR and LDDRWhat addressing mode would the instructions LDIR and LDDR be classed as using? Would I correct in thinking that they're register indirect, as both t…
What addressing mode would the instructions LDIR and LDDR be classed as using?
Would I correct in thinking that they're register indirect, as both the source (HL) and destination (DE) registers are pointing into memory? -
[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…
... relying on ROM calls or LDIR) as a learning exercise. What ... this code is faster than LDIR because that is operating on ... -
New protection systemsAs a follow-up to [URL="http://www.worldofspectrum.org/forums/showthread.php?t=14311&page=2"]this[/URL] thread regarding relatively new protection sy…
[QUOTE=Patrik Rak;187143]I had a look ... at $4000 and removing those LDIR instructions to see if the ... -
New protection systemsAs a follow-up to [URL="http://www.worldofspectrum.org/forums/showthread.php?t=14311&page=2"]this[/URL] thread regarding relatively new protection sy…
[QUOTE=Patrik Rak;187166]The screen content doesn' ... can't just remove the LDIR as it would affect the ... -
New protection systemsAs a follow-up to [URL="http://www.worldofspectrum.org/forums/showthread.php?t=14311&page=2"]this[/URL] thread regarding relatively new protection sy…
[QUOTE=Patrik Rak;187166]The screen content doesn' ... can't just remove the LDIR as it would affect the ... /> However I will mention that LDIR (or LDDR) coupled with the ... val or R entering the LDIr then val (2*BC value ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
[QUOTE=Patrik Rak;636071]OK, here goes a ... people would probably use an ldir to compactly initialize data structures ... it more convenient than an ldir.
A typical usage ... -
Advice about drawing sprites on spectrum I've coded sprite drawing before and know all the theory about masks from a long time ago (microhobby rules! ;), but since I did it on Amiga with ha…
... a hidden screen, and then LDIR to real screen at interrupt ... -
Z80 core testing ?OK, my z80 core is almost finished (apart from RRD, RLD, and block instructions except LDI,LDIR,LDD,LDDR). I run the 48K rom and hurray, it resets co…
... , and block instructions except LDI,LDIR,LDD,LDDR). I run the ... -
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 …
... [/url]
Instead of LDIR or multiple LDI's I ...
LD (HL),%01000111
LDIR
MAIN:
Smooth Masked Sprites using fast page flip on 48k Part 2Ok, After all the suggestions in Part 1, which were all excellent (Thankyou), I opted on the following: I have 2 x 6k Offscreen areas (Yes, that's …
Fastest way to write something to screen$Hi, I just got pasmo.exe and start playing with attr scrolling, well, not scrolling, just write different values to a block and see if I can introdu…
... the screen. I know that ldir/lddr are slow, but not ...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?Old emulators on DOSBOX.Sadly, my Win'98 machine is going loco a bit too often. I've finally decided that I'll have to move everything over to the noisy, underused XP machi…
... : :)
(Z80 V3.02 - LDIR on, all other slowdowns off ...Which ZX Spectrum 48K game-music is the best?Hi there. I got an idea I could ask here about the topic like above. What do you think? C64 fans made a ranking of their beloved songs from games…
... - Solomon's Key -
Patrik Rak - Star Dragon -
Frantisek Fuka ...Mode 2 Tile Editor SourceA Timex Mode 2 Tile Editor incorporating a byte mirror table. The compiled version is available in the CSSCGC 2008 collection from the WoS archive. …
... remaining bytes to clear
ldir ; wipe screen
ret ; done ...Currah MicroSource emulationIt appears to be impossible to emualte the MicroSource in software on the ZX Spectrum SE as hardware polling is required. The following patch is not …
... /> ld bc,$4000 ; length
ldir ; copy
; page ... /> ld bc,$2000 ; length
ldir ; copy
; emulate ... /> ld bc,13 ; length
ldir ; copy
; ... /> ld bc,22 ; length
ldir ; copy
; move ...New Spectrum emulator for DS[url]http://zxds.raxoft.cz/[/url] [quote]Features already implemented: * Solid Z80 core - possible bugs aside, the Z80 emulation is as complete…
... .org/infoseekpub.cgi?regexp=^Patrik+Rak$]this guy[/url]...My little first set of routines.Hi all, I just coded a little set of routines just to draw a screen on video mem and a fade out. I could have just copied the screen rendering rout…
...
ld bc,6143
ldir
ret
;---------------------------------------------------------------;< ... of bytes per line
ldir ;draw line
...Blok*Load on Multiface 128Spinning this off into a new thread to avoid cluttering up the original: [url]http://www.worldofspectrum.org/forums/showthread.php?t=17999&page=7[/u…
... (05CE9h),A ;overwrite end of LDIR routine with a RET
CALL 05CD0h ;execute the LDIR routine then return to us ...The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…
... to copy a buffer, simply LDIR it to wherever it ought ... number of T-states as LDIR.
I shall ponder ...ANN: Tipshop updated Wednesday, 27 February 2008Wednesday 27 February 2008 Loads of POKEs from assorted folks, and tips straight from the author of the games. * Stu sent in a correction for the t…
... Saboteur II.
* Patrik Rak sent in cheats for Atomix ...
