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<1234567…34>
  • 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?
    cmonkey cmonkey January 2015 Development
  • Alice, Bob and SteveAlthough I spend about ?100 a year on new hardware, I'm dismissed as a purist as I regards the original Spectrum as a bit special. What I realised fa…

    ... genius, a merlin's box and that the author had made ... learn Z80 assembler and if all you saw was LDIR and accumulators then ... />
    Currently teaching Quantum Computing and Cryptography his lecture slides were ...
    Geoff Geoff March 2010 Sinclair Miscellaneous
  • 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…

    ... ) ; get line number
    and %11000000 ; test it
    ... 0x0909
    me_old_v2:
    and %11100000 ; consider bits 7 to ... stack new pointer
    ldir ; copy the new variable or ... ; send header with type and parity byte
    ld b, ...
    chev chev October 2013 Development
  • So... you want to format your 3.5" as 720K eh?Well, i've been trying to get hold of an application to make proper use of my 3.5" +3 floppy disks but i haven't been able to find any. I stumbled up…

    ... INC IX
    DJNZ FOR3 ; And keep looping until all the ... of 16 bytes
    LDIR ; Transfer it to the ... filled with $E5
    LDIR ; And here we fill the remaining ...
    NaMcO NaMcO December 2008 Development
  • FBSThis is one of those things that is more like an experiment than a real project. I was trying to do this in BASIC, then realised my BASIC was too ru…

    ... still uses old fashioned UDGs, LDIR and the old BEEP. :lol:
    Timmy Timmy February 2014 Development
  • High score table routineI wrote this general purpose high score table routine. It stores 5 scores and displays them alongside the player names, which are 8 characters long. …

    ... /> LD BC,2
    LDIR ; ...and becomes the new fifth score ... br /> LD BC,8
    LDIR
    OR A ; do ... br /> LD BC,8
    LDIR
    OR A
    ...
    LD BC,8
    LDIR
    RET

    ...
    Alessandro Grussu Alessandro Grussu July 2017 Assembler
  • 48K protectionWhich games were 'protected' by loading a full 48K block of code so that no copy program could fit in to memory? I know of 2 by heard. Pole Positio…

    ... : Screen, sysvariable to 24999 and 24999 to 65536. Then I ... to the right adress with LDIR and then starts the decompressor with ... was the "Masterhacker", and later "Tiger?s Claw", and this was not ... I repaired some of them, and still not understanding the fact ...
    LCD LCD August 2001 Games
  • Most engrosing Adventure GameThis is one for all you text adventure lovers. Of which I am one. I remember reading those Fighting Fantasy books when I was a kid. The ones where y…

    ... should learm the basics like LDIR and such things...
    LCD LCD April 2003 Games
  • Extracting the Multiface ROM?Is there an easy way to save the contents of a real Multiface 128 ROM to tape, on a real spectrum, for the purposes of transferring it to PC for emul…

    ... in the MF128 ROM and then LDIR the contents from 0 ... the code copied by the LDIR and that should be all you ... /> LD DE,32768
    LDIR
    IN 191,A ;maybe ... excellent coders here at WoS and I'm sure they ... you have a multiface 128 and not an MF1? That ...
    DEATH DEATH June 2006 Hardware
  • Pimp my code...Erm, this is just the result of a mental exercise - I wanted to repeatedly display a UDG but decided against using a ROM routine and UDGs! Any sugges…

    ... /> [/code]

    :-)

    LDIR (and LDI) is fast for copying ... An LDIR takes close to 21 cycles per byte and an unrolled ... between 16 (totally unrolled) and 21 (not unrolled at all ... ret
    [/code]

    and takes about 5.7 cycles ...
    Alcoholics Anonymous Alcoholics Anonymous August 2006 Development
  • Currah MicrosourceHi Anyone here got a Currah Microsource ? I have one, its one of the original eval units complete with 'draft' manual. Just interested to see how …

    ... bus for a fixed address and pages in (as you say ... a variety of IN addresses and monitor the rom memory against ... longer match - bingo! A quick LDIR and a multiface snapshot before it ...
    BloodBaz BloodBaz October 2006 Sinclair Miscellaneous
  • My emulator doesn't take "commands"Hi This is probably a question that is very hard to answer, but perhaps some of you have/had the same problem. In my own emulator (that I have built)…

    ... up. An error in LDIR/LDDR could, and DAA problems can cause ... occurring half way through a LDIR? And does that correctly go back ... and complete the loop on exit? ... waiting on some counter value and you might be able to ...
    Laser Laser March 2007 Emulators
  • A few questions about machine codeOh no... another noob. I'm giving my first steps in assembler (finally, after 20 years stuck in BASIC). I read a SU article explaining that if I wan…

    ... stuff" instructions (i.e. ldir, cpir, otir et al.) ... all the documented instructions!) and is rather good.
    and BC the number of ... same way as the ldir instruction. For example, ... block instructions use BC. LDIR and LDDR do, but OTIR, ...
    Winston Winston August 2007 Sinclair Miscellaneous
  • A few questions about machine codeOh no... another noob. I'm giving my first steps in assembler (finally, after 20 years stuck in BASIC). I read a SU article explaining that if I wan…

    [QUOTE=Winston;210048]Not all the block instructions use BC. LDIR and LDDR do, but OTIR, INIR, OTDR, CPIR and friends just use B.[/QUOTE]

    CPIR is like LDIR in that it uses the BC pair and not just the B register.
    jonathan jonathan August 2007 Sinclair Miscellaneous
  • A few questions about machine codeOh no... another noob. I'm giving my first steps in assembler (finally, after 20 years stuck in BASIC). I read a SU article explaining that if I wan…

    ... the block instructions use BC. LDIR and LDDR do, but OTIR, ... INIR, OTDR, CPIR and friends just use B. Other ... as the loop counter, and some instructions seem a ... byte is always $FE and the upper address byte resets ... one per semi-row), and does this 8 times.
    Marcelo Marcelo August 2007 Sinclair Miscellaneous
  • A few questions about machine codeOh no... another noob. I'm giving my first steps in assembler (finally, after 20 years stuck in BASIC). I read a SU article explaining that if I wan…

    ... as a BYTE COUNT like LDIR and CPIR etc.
    ... br /> All "repeat instructions" (LDIR, LDDIR, CPIR INIR, OUTR) ... defined by the LDIR instruction. The microcode ... and jump the Program Counter back two bytes to run the LDIR ... instruction again and again.
    BloodBaz BloodBaz August 2007 Sinclair Miscellaneous
  • Question about digitized sound and videoI searched the forums and couldn't find the answer, so here it goes. Regarding digitized sound: I remember reading an article long ago about a vid…

    ... best way to playback video, and someone suggested some type of ... made progress with Real-X and his his conversion program could ... the data should be stored and have a player routine for ... bytes (copied to screen using LDIR) and not changed bytes (jumped over ...
    LCD LCD November 2008 Development
  • Assembler snippetsI was just thinking that a thread for small but useful assembler snippets to do useful things would be cool for people learning z80 coding. Not to me…

    ... way is probably the longest and using the stack or lots ... of a small, fast and generic LDIR replacement routine at the bottom ... use this routine instead of LDIR and only bother going for a ... if I really need it... and it's only about 45 ...
    evilpaul evilpaul January 2009 Development
  • Writing to the screen from a bufferI?m designing a game and am spending a bit of time trying different ideas before I commit my self. I?m currently thinking of writing data to a buffer…

    ... are referring to the hot LDIR action to draw the screen ... /> Well, you could unroll the LDIR and have a mass of LDIs ... the whole screen is animating and there are a million sprites ...
    frobush frobush June 2009 Development
  • Bit functions speedI just stared nonplussed at the documentation for the bit functions. Apparently, if you're using the accumulator, using AND and OR is faster than se…

    ... obviously worse (both in size and speed) RR A exists? ... to the carry flag and the previous contents of ... to the carry flag and the previous contents of ...
    P/V is parity
    See instruction for ... I can tell the zero and parity flags are activated with ...
    Gedlion Gedlion February 2010 Development
  • 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…

    ... Miner remakes but the slowness and flickering made me a sad ... MM was the slug like LDIR and raster glitching. You have remove ...
    frobush frobush February 2010 Games
  • 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…

    ... and where the registers point to:
    [list]
    [*] whether the LDIR ... to look at NOT using LDIR and using chains of LDI instructions ... of the stack pointer register and PUSH data onto the ... interrupt to just a RETI and start your screen rendering immediately ...
    BloodBaz BloodBaz June 2010 Development
  • DMA interface for ZX Spectrum[url]http://velesoft.speccy.cz/data-gear.htm[/url] This is internal DATA-GEAR interface for any 8-bit computer with Z80CPU. Use Direct Memory Access…

    ... . DMA work only as fat LDIR and need long time for set ...
    velesoft velesoft September 2010 Hardware
  • logical operators and the calculator stackI was wondering if there was a utility which would provide the list of commands needed for the ROM calculator to evaluate a logical expression. For e…

    ... /> rst 20h ;And the next one must ... in workspace
    ldir ;And copy the param block ... br /> call EXPT_2NUM ;And do it. The two ... BC
    call PLOT_CB ;and PLOT them.

    mcleod_ideafix mcleod_ideafix October 2010 Development
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ... besides FM7 - C128 had 6502 and Z80 (switchable modes), UKNC had ... (one for graphics, other central), and probably more. Video game consoles ... , so you can use even LDIR (and it has twice faster Z80 ...
    Shiru Shiru December 2010 Hardware
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ... , so you can use even LDIR (and it has twice faster Z80 ... and a lot of RAM).[/QUOTE]< ... /> Exactly. A great invention.
    And if anybody would like to ... NeoGS to play MOD files and the machine would think it ...
    Mister Beep Mister Beep December 2010 Hardware
  • NaveI found a game called "NAVE" by Lusitania Software Authors: Laurindo Sobrinho, Lucio Quintal, Tony Sobrinho Release date is 1990-91 The message langu…

    Well, that could be a perfect TZX of an imperfect game, no? ;)

    Anyway, it sits looking to load 1 byte (with flag and parity, that's 3 bytes) with the level number, but I can't seem to be able to fool it into going any further.
    lfaria lfaria April 2012 MIA/STP/SDP
  • 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…

    ... the role of DE in LDIR and related instructions, was to look ...
    Arjun Arjun August 2012 Development
  • my tiny intros[IMG]http://pouet.net/screenshots/60493.png[/IMG] [url]http://pouet.net/prod.php?which=60493[/url] the following work will appear behind Demosplash…

    ... "fire" in the demo and fade out in the ' ... longtime operations of the processor and the prefix # DD ... out.

    and one simple example of how ... 1: inc hl: ldir
    add a, 8: and # 3f: ld ... add a, b: and # 3f
    ldir
    And replace the 2- ...
    g0blinish g0blinish October 2012 Development
<1234567…34>

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