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<1…9101112131415…34>
  • Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…

    ... like this:

    0x0028 JP 0x335B
    0x002B RST 0x38 ... this.

    0x0028 JP 0xFFFD
    0x002B RST 0x38 ... ,#0xFFFF ; DE=0xffff
    0x0005 JP 0x11CB
    ...
    0x11CB ... end jump to the original jp location.

    --- INTERFACE ...
    tstih tstih July 2014 Development
  • Help with Manic Miner tweaksPlease. :) This is the Software Projects version, simply as I had it to hand. [B]Problem 1:[/B] I've learned a bit (actually quite a bit) and manag…

    ... /> POP HL ; 36838 225
    JP L_9033 ; 36839 195 51 144 ...
    spider spider July 2014 Games
  • +2A fixing Loaders request: Ghosts N? Goblins, Travel with Trashman and DuetIf anyone fancies, I would appreciate a lot to get the loaders, you know, the BASIC listing with a lot of DATAs, to type them, save them in cassette …

    ... !

    By the waym, jp, if you are reading me ...
    Ivanzx Ivanzx July 2014 Games
  • analysing program variable usageIf I wanted to count the number of times each variable is referenced while a program is running (not the number of times each variable is referenced …

    ... HL,[true (VARS)], CALL (not JP) $2900 V_EACH. If it still ...
    Battle Bunny Battle Bunny July 2014 Sinclair Basic
  • Pause XWhat would be the best way to implement a short delay (unlike with basic, without any key detection to cut it short) in assembly ? Basically somethi…

    ... the loader call and the JP to execute the code, just ...
    spider spider August 2014 Development
  • ANN: Tipshop updated Tuesday, 30 September 2014Tuesday 30 September 2014 2 updates within a couple of weeks of each other - you're spoiled. Or something * JP provided a correction for a cheat fo…

    ... spoiled. Or something

    * JP provided a correction for a ...
    hackersanon hackersanon September 2014 Announcements
  • ANN: Tipshop updated Saturday, 29 November 2014Saturday 29 November 2014 2 updates in a month - woohoo! * Andy Ryals sent in POKEs for Archeomania , Dark Tricks, Donkey Kong Reloaded Again, Find…

    ... /> * Zup reported a bug and Jp provided the fix for Rocky ...
    hackersanon hackersanon November 2014 Announcements
  • SkoolKit 4.2SkoolKit 4.2 has been released. SkoolKit is a set of command line utilities for disassembling Spectrum software, into ASM format or into a bunch of …

    ... in the operands of CALL, JP, DEFW and LD instructions)
    SkoolKid SkoolKid December 2014 Announcements
  • Strange keyboard port reads on 48+Hi all, I don't know whether it was already discussed (I also searched forum, but there are too much of results searching "48k keyboard" so I didn't…

    ... /> ret z
    endm
    jp loop
    [/CODE]

    ub880d ub880d January 2015 Hardware
  • ANN: Tipshop updated Thursday, 26 February 2015Thursday 26 February 2015 Happy New Year! Happy Valentines! Happy .. Oh, forget it (Yes, you're just a tad late. Ed) * Philip M. Anderson sent in P…

    ... POKEs for Impossaball.

    * JP provided POKEs for Subway Vigilante ...
    hackersanon hackersanon February 2015 Announcements
  • Playing AY music on the SpeccyCan anyone help with playing AY ripped music on the Speccy? So, let's say I want to play some ripped AY music, such as: [url]ftp://ftp.worldofspect…

    ... for jump instr

    jp start

    music:
    badgyre badgyre February 2015 Development
  • SkoolKit 4.4<div><font face="Arial, Verdana"><span style="font-size: 13.3333330154419px; line-height: normal;">Hey, first SkoolKit release announcement since the…

    ... in the operands of CALL, JP, DEFW and LD instructions)
    SkoolKid SkoolKid May 2015 Announcements
  • Spectrum Games from Japan, some high quality titlesHey guys, I have to sell off some of my Spectrum games and other pieces. Everything is located in Japan, but shipping is not as bad as you might thin…

    ... is here: http://pcbiroiro.blogspot.jp/ If you really want you ...
    MagicKnight MagicKnight June 2015 Sales
  • Rastan,North and south, Athena,Renegade,Arkanoid wanted<span style="font-weight: bold;">Hi</span><div><span style="font-weight: bold;">looking for the games mentioned, big box pref, but budget fine too :)…

    Hilooking for the games mentioned, big box pref, but budget fine too :)
    wilsone73 wilsone73 June 2015 Wanted
  • ZX-Assembler version 0.8 (beta) releasedDear readers, yesterday I've published ZX-Assembler in its first version 0.8. It offers you some interesting features, even if I know there are …

    ... , including DJNZ --> DEC B: JP ...

    * A big summary ...
    clausjahn clausjahn July 2015 Emulators
  • Could use some help improving some controls.Back when Dingo was released many people said they had problems controlling it, so I've decided to improve the controls on it, so you no longer need …

    ... /> cp 16
    jp c,up
    jp down
    [/code]
    Sokurah Sokurah July 2015 Development
  • Code structureHi all, I'd be interested in opinions on the neatest way to do this. I've got a print string routine in which 0-31 are reserved for control codes, …

    ... , >31 printable ASCII
    jp c,control_code
    ...print char ...
    ...jumps to routine in jp table based on contents of ... /> But each routine ends with JP PRINT_STRING so the next byte ... lots of routines end in JP rather than RET.

    R-Tape R-Tape August 2015 Development
  • How to Write ZX Spectrum Games - Jonathan CauldwellHello, I'm trying to improve my very basic level of assembler by reading the Jonathan Cauldwell guide. I'm fine with the basics LD, CP, and JP,…

    ... the basics LD, CP, and JP, but I'm quite new ... -string
    call 8252
    jp loop

    string defb ...
    jonesypeter jonesypeter October 2015 Development
  • ANN: Tipshop updated Friday, 30 October 2015Friday 30 October 2015 Lots of new POKEs, tips for a SAM game and a rather belated compilation of RZX Archive updates * Andy Ford provided new P…

    ... POKEs for Lirus!.

    * JP provided POKEs for Day In ...
    hackersanon hackersanon October 2015 Announcements
  • Text scroller and custom fontYesterday I was testing this text scroll routine taken from Jonathan Cauldwell's Intro Maker (labels have been inserted to allow partial code relocab…

    ... NZ
    CALL L_35414
    JP L_35387
    L_35413: DEC C ...
    Alessandro Grussu Alessandro Grussu January 2016 Development
  • Help! I'm learning Machine Code...Having decided to take the plunge and learn to machine code a while ago, I have started in earnest using the much recommended 'Mastering Machine Code…

    ... /> RET
    INC B
    JP (469C)[/code]

    When ...
    namtip namtip February 2016 Development
  • Fixing broken link on arkanoid pagehello the link on this page: http://worldofspectrum.org/infoseekid.cgi?id=0000255 for "Super Noid Christiaan Kras 2002 PC/Windows in progres…

    hello

    the link on this page:

    http://worldofspectrum.org/infoseekid.cgi?id=0000255

    for "Super Noid Christiaan Kras 2002 PC/Windows in progress (link dead?)"


    links to: http://www.div-arena. ...
    MikeDX MikeDX February 2016 Updates
  • Z80-Code Flow-Chart Analysing ToolHi all, when working on my current Speccy Project with Pasmo, i imagined, it would be nice to have a tool for analysis of produced Z80-Code on t…

    ... nesting of
    CALLS and JP/JR's, maybe restricted to ...
    Andy Schraepel Andy Schraepel March 2016 Development
  • Which Is The Best Breakout?: Tonic Tile (ST) vs Giganoid (Amiga)Well last months "Which Is Best?" saw Speedball go against Speedball 2, in the end it was Speedball 2 that one the battle,...BUT it wasn't a landslid…

    ... (ST) vs Giganoid (Amiga),...no Arkanoid votes please ;-)

    All ...
    ZEUS ZEUS June 2016 Chit chat
  • Detecting TR-DOS w/o relying on system variablesOK, I know it's much easier to do this simply by checking whether the BASIC program area has moved or some specific pattern in the sysvars etc (somet…

    ... '.
    ld d,h
    jp #3D2F ;RETs immediately if TR ...
    Hikaru Hikaru July 2016 Development
  • Basic Screen Shadow QuestionHello, I've been porting a game to the Spectrum from another platform. So far so good and I have per pixel screen scrolling working really nicely …

    ... ,d
    or e
    jp nz, _loop
    ret
    or e
    jp nz, _loop
    ret[/code ...
    pointblnk pointblnk August 2016 Development
  • Mastering flagsI'm little lost when different flags are set/reset after logic operations, and what conditions must be met. For example, [code] ld a, MODE…

    ... , MODE
    xor (hl)
    jp p, xxx
    [/code]
    Bedazzle Bedazzle September 2016 Development
  • sdcc inline assembly wtf..So, I'm trying to get division to work. By googling I've found one division algorithm that's quoted in several places, but can't seem to get it to wo…

    ...
    sbc hl, bc
    jp nc,_loop
    ld h ...
    Sol_HSA Sol_HSA September 2016 Development
  • SUB and the S flagGuys, if I use SUB to take a value HIGHER than is currently in A, does the S flag get set? I know that N does. [code] LD H,33d LD A,32d SUB H …

    ... ,32d
    SUB H
    JP M.....
    ....
    ....
    [/code ...
    DEATH DEATH November 2016 Assembler
  • Code optimisation! 16bit number to 5 digit stringJust for interest this one, any thoughts on how to make this as fast as possible? Little optimisations to this routine or a complete reimagining? …

    ... b ;overclocked beyond 9?
    jp c,cont
    ld (hl ... digit
    dec l
    jp lp
    cont: ld l ... ,d
    or e
    jp nz,lp
    ret
    R-Tape R-Tape December 2016 Development
<1…9101112131415…34>

Latest Posts

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