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<1234567…34>
  • Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…

    ... left or right
    ;jump back to PRINCIPALLOOP
    GAMEOVER ... them as entry points to jump to.
    In ... djnz stands for Decrement then Jump if Not Zero. We ... label for our loop to jump back to.
    ... /> 'jr nz' stands for jump relative if not zero. It skips ...
    bigjon bigjon November 2009 Development
  • [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…

    ... until c = 0. Faster than jump relative when branch is taken, but ... until c = 0. Faster than jump relative when branch is taken, but ...
    ST1 ST1 November 2018 Development
  • Dangerous Z80 Assembly CommandHave been reading Toni Bakers' "Mastering MC On Ya Speccy" book and came across the list of Z80 commands in the dictionary section. Page 102 "[b]IM…

    Damn. And I was hoping someone had discovered an undocumented JRCF (Jump Relative and Catch Fire) instruction.
    Winston Winston March 2008 Sinclair Miscellaneous
  • Dangerous Z80 Assembly CommandHave been reading Toni Bakers' "Mastering MC On Ya Speccy" book and came across the list of Z80 commands in the dictionary section. Page 102 "[b]IM…

    [QUOTE=Winston;252236]Damn. And I was hoping someone had discovered an undocumented JRCF (Jump Relative and Catch Fire) instruction.[/QUOTE]

    Heh heh. Only available on the 6502.
    Alcoholics Anonymous Alcoholics Anonymous March 2008 Sinclair Miscellaneous
  • 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 …

    ... last operation was zero, jump back to [B]readkey ... some subtleties - JR means 'JUMP RELATIVE'. There's also JP ... meaning just 'JUMP'. The difference is, JP ... can instruct it to jump forward or back by ... and the jumps are still relative. If you use JP, ...
    joefish joefish April 2009 Development
  • Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?

    ... /> DJNZ e Decrement B and jump relative if B=0.
    EI ... true.
    JR C,e Jump relative to PC+e if carry ... 1.
    JR e Unconditional jump relative to PC+e.
    JR ... NC,e Jump relative to PC+e if carry ...
    Ralf Ralf October 2011 Development
  • Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…

    ... left or right
    ;jump back to PRINCIPALLOOP
    GAMEOVER ... them as entry points to jump to.
    In ... djnz stands for Decrement then Jump if Not Zero. We ... label for our loop to jump back to.
    ... /> 'jr nz' stands for jump relative if not zero. It skips ...
    buzzy buzzy September 2012 Development
  • ZX-Modules app reportZX-Modules app report If You are interested, I want to report about the state and progress about my ZX-Modules programs. I would like to report at l…

    ... .jpg[/IMG]

    The jump relative problem has also be solved ... command. For that 7-bit jump addressing, this is out of ...
    clausjahn clausjahn May 2014 Emulators
  • INC not working as expected in LoopHi, i have been working on this for around 2 weeks now and Ive read myself into a hole. I am trying to increment HL. HL is referencing a display …

    ... get to line 250 and jump back to main, what's ...
    100 If space then Jump Relative to label "right"

    190 Jump to label main

    jump back to main.

    hedge hedge April 2018 Assembler
  • Games Requiring Left, Right and JumpJust downloaded PocketClive and I must say it's very impressive on my Compaq PocketPC. Only problem is it's not the best of input devices for games …

    ... simply require left, right and jump/kick/shoot combinations only.
    choccy48K choccy48K May 2003 Games
  • Announce: Jump! for the ZXSpectrum 48kFor the last week and a bit I've been spending idle periods at work coding my latest entry for the crap computer game challenge, you can view the cra…

    ... /> url:http://www.supermonkeyworld.com/Jump!.tap

    Instructions: Skip ...
    AndyHerbert AndyHerbert May 2004 Games
  • Jump! prereleaseJust finished my entry for the Crap Games Compo 2005; it's called "JUMP! The Ultimate Platform Game" Before sending it to CGC, I'll post it here so …

    ... Compo 2005; it's called "JUMP! The Ultimate Platform Game"
    jump.zip"]http://www.geocities.com ... /cagoncristo/jump.zip[/url]

    You ...
    cascarria cascarria April 2005 Games
  • Mr JumpThis is probably not the place to post this but here goes.. I made a Flash game called Mr Jump, it's a homage to Manic Miner. I'm imagining ZX puris…

    ... a Flash game called Mr Jump, it's a homage to ...
    ultraniblet ultraniblet October 2006 Chit chat
  • how many jump em ups can you name?i can name two i'd class as bona fide jump em ups bugaboo the flea jumping jack

    i can name two i'd class as bona fide jump em ups

    bugaboo the flea
    jumping jack
    mel the bell mel the bell February 2008 Games
  • Long jump in a truckNicely animated simple game [URL="http://www.aglassandahalffullproductions.com/#/trucks/big-air/"]here[/URL] Post your longest jump (an OK 43.19 …

    Nicely animated simple game

    [URL="http://www.aglassandahalffullproductions.com/#/trucks/big-air/"]here[/URL]

    Post your longest jump

    (an OK 43.19 for me to start)
    Jumping Stack Jumping Stack November 2008 Chit chat
  • How to code a run and jumpHi all, Is there a way in basic to take action on two simultaneous key strokes. I want to add a run and jump i.e. keys Q and M but using inkey$ seem…

    ... to add a run and jump i.e. keys Q and ...
    hedge hedge January 2011 Development
  • How to jump in Jungle Trouble?Please can someone help me? I've seen the rzx. I'm sure it's possible. I can't get off the bottom right hand corner. The instructions say to press t…

    ... instructions say to press the jump key after a run up ... which key is actually the jump key. I'm sick of ...
    Gedlion Gedlion July 2011 Games
  • Renegade with out Jump KickInspired by the thread about Target Renegade, I got in to playing both games this week (and after 24 years, I've finally defeated all bosses from Ren…

    ... renegade is to master the jump kick, and once you know ... Renegade with out using the Jump Kick (I betting on NOT ...
    VanTammen VanTammen September 2011 Games
  • JumpDo you prefer controllable jumps ie you can change direction mid jump. Or do you prefer the uncontrollable jumps of something like Manic Miner/Jet Se…

    ... you can change direction mid jump. Or do you prefer the ... I can't decide which jump mechanic to implement.
    Rebelstar without a cause Rebelstar without a cause October 2011 Games
  • Jump, german hack of the game manic climberJump: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0023695[/url] is a hack of the game: [url]http://www.worldofspectrum.org/infoseekid.cg…

    Jump:

    [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0023695[/url]

    is a hack of the game:

    [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0017129[/url]

    ;)
    Ivanzx Ivanzx April 2012 Infoseek database
  • How to write self-relocating code using Pasmo?With z80asm, I can write code like this: [CODE] org 0 ; a total lie, but makes the reloc sums work .dest: equ …

    ... ; addr of code to reloc, relative to 0...
    add hl ... ,bc ; ...but now in HL relative to entry addr
    ld ... the relocation
    jp .dest ; jump to the relocated code
    stephenw32768 stephenw32768 August 2013 Development
  • Jump by Ventamatic should be renamedAs Jump was the name used in the re-release, the entry should use instead the original name of the game, Crazy Climber ;) [url]http://www.worldofspe…

    As Jump was the name used in the re-release, the entry should use instead the original name of the game, Crazy Climber ;)

    [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0002656[/url]
    Ivanzx Ivanzx August 2013 Infoseek database
  • LZ4 decoderI encountered the [URL="http://code.google.com/p/lz4/"]LZ4 compressor[/URL] a few weeks ago. Reading the [URL="http://fastcompression.blogspot.co.uk…

    ... fairly straightforward, suitable for a relative beginner at Z80 coding to ... c
    jr nc,.read_offset ; jump forward if not; no literals ... (4T)
    jr nc,.getlength_nocarry ; jump forward if carry not set ...
    stephenw32768 stephenw32768 October 2013 Development
  • Keop?s Revenge, to Albert Valls, How to jump??Im playing this funny and BASIC made game and managed to reach the snakes screen, but I cant find which key is used to jump... Tried "Q" as it is use…

    ... which key is used to jump... Tried "Q" as it is ...
    Ivanzx Ivanzx August 2014 Games
  • Zero 0.7 / Zero 0.6.5 releasedAfter months of grueling work, I?m proud to announce the Vanilla version of Zero, which is a regular Windows version of the emulator. I?ve tried to m…

    ... machine (v0.7).
    ? Fixed relative jump addresses not wrapping correctly if ...
    Arjun Arjun January 2015 Emulators
  • For Profi Interface users- jump to EsxdosHello again, this time something for Profi Interface users. I wrote together with Velesoft installation and jump to Esxdos. So, enjoy it. Inf…

    ... together with Velesoft installation and jump to Esxdos. So, enjoy it ...
    Hood Hood February 2018 Brand new software
  • Less uMIA - Jump & Reversi (-)(Power-Soft)(DE)Hi All :) small title, and have zero info about ... :) but let see what we have ... :) inlay [img]http://forest.no-ip.org/wos/jr2/inlay.jpg[/img…

    ... .no-ip.org/wos/jr2/Jump%20%26%20Reversi%20(-)(Power ... .no-ip.org/wos/jr2/Jump%20%26%20Reversi%20(-)(Power ...
    gorski gorski January 2019 MIA/STP/SDP
  • Head Over Heels remake RELEASED !Hey all ! The Retrospec remake of Head Over Heels has JUST been released. The URL with everything important, including a 15Mb download is : [url="h…

    ... may be a little fast relative to the speed of Heels ... and right down , expecting to jump right when I hit it ...
    John H John H September 2003 Games
  • 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 …

    ... code (rather than an absolute jump/call of a section) as ... your head) conversion to a relative offset for things like JR ...
    AndyC AndyC September 2004 Development
<1234567…34>

Latest Posts

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Related Threads

  • Relative price of the spectrumAs Im sure you all know one of the biggest selling points of the speccy was its price.I was reading the other day that the 48K Spectrum cost ?175 - ?…
  • Games Requiring Left, Right and JumpJust downloaded PocketClive and I must say it's very impressive on my Compaq PocketPC. Only problem is it's not the best of input devices for games …
  • Goodbye void.jump.orgI see this domain name's being discontinued. This was my preferred way of accessing WoS (easier to type than worldofspectrum.org) so I'm a bit sad t…
  • Announce: Jump! for the ZXSpectrum 48kFor the last week and a bit I've been spending idle periods at work coding my latest entry for the crap computer game challenge, you can view the cra…
  • Jump! prereleaseJust finished my entry for the Crap Games Compo 2005; it's called "JUMP! The Ultimate Platform Game"<br /> <br /> Before sending it to CGC, I'll post…
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  • Mr JumpThis is probably not the place to post this but here goes..<br /> <br /> I made a Flash game called Mr Jump, it's a homage to Manic Miner. I'm imagin…
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