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<1…21222324252627…34>
  • Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…

    ... A_is_4
    cp 5
    jp z,A_is_5

    ; ... dec a
    jp z,A_is_5

    ; Even better
    ld ... br /> ld l,a
    jp (hl)

    VectorTable ... br /> ld hl,(jump_table)
    jp (hl)
    jump_table:
    ...
    MatGubbins MatGubbins August 2015 Development
  • Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…

    ... dec a
    jp z,A_is_5

    ; Even better
    ld ... br /> ld l,a
    jp (hl)

    ... br /> ld hl,(jump_table)
    jp (hl)
    jump_table:
    ... case could be optimized further even without using aligned tables. ...
    Einar Saukas Einar Saukas August 2015 Development
  • Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…

    ... previously mentioned:
    [code]
    ; Even better
    ld a,(Number ... l,a
    jp (hl)[/code]

    Even without using aligned ... )
    ld l,a
    jp (hl)[/code]
    Einar Saukas Einar Saukas August 2015 Development
  • Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…

    ... about this NMOS Z80 bug. Even worse, I'm afraid this ... ]
    ld a, i
    jp pe,label
    ld a ...
    Einar Saukas Einar Saukas September 2015 Development
  • Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…

    ... the initial one was using "jp endif".

    Also, a ... this particular example, we could even replace the ld a,3 ...
    Metalbrain Metalbrain September 2015 Development
  • Full-screen 32 columns bicolor engine NIRVANA+I'm glad to announce the release of [b]NIRVANA+ ENGINE[/b], providing support for bicolor graphics (multicolor 8x2) in 32 columns for all standard Sp…

    ...

    jp NIRVANA_start
    jp NIRVANA_stop
    jp NIRVANA_printC
    jp NIRVANA_printC[/quote ... didn't want to waste even a single byte in original ...
    Einar Saukas Einar Saukas September 2015 Brand new software
  • What is the "SPECTRUM" keyword on a 128K?The 128K replaced UDG characters T and U with new commands; PLAY and SPECTRUM (or possibly the other way around.) The manual ([url="http://www.wor…

    ... /> LD (BANK_M),A ; $5B5C.
    JP SWAP
    [/code]
    Now ... tested yet if it's even necessary to call that routine ...
    zPasi zPasi October 2015 Sinclair Basic
  • What is the "SPECTRUM" keyword on a 128K?The 128K replaced UDG characters T and U with new commands; PLAY and SPECTRUM (or possibly the other way around.) The manual ([url="http://www.wor…

    ... " command in its loader which, even (and especially as this was ... 5B00h with
    [CODE]
    JP 9C67h
    NOP
    NOP ... !
    LD (5B5Ch),A
    JP 5B05h
    [/CODE]
    John Elliott John Elliott October 2015 Sinclair Basic
  • What is the "SPECTRUM" keyword on a 128K?The 128K replaced UDG characters T and U with new commands; PLAY and SPECTRUM (or possibly the other way around.) The manual ([url="http://www.wor…

    ... " command in its loader which, even (and especially as this was ... 5B00h with
    [CODE]
    JP 9C67h
    NOP
    NOP ... !
    LD (5B5Ch),A
    JP 5B05h
    [/CODE]
    John Elliott John Elliott October 2015 Sinclair Basic
  • What if there was a Speccy Games Console[img]http://segaretro.org/File:MSEvolution_Black_Console.jpg[/img] This would have made a really good looking spectrum console back in the day (mi…

    ... normal computer variant is an even worse idea. In fact ... the C64 console, and even the 16-bit computer based ... vision, like Sinclair (or even me). An 8-bit ... Master System) in 1983 (JP) and 1985 here. It ... had some hardware improvements, even something as simple as ...
    retrogod retrogod November 2015 New game ideas
  • Interface 1 - RS232 question.I am thinking about doing some Spectrum stuff based around the RS232 port used on the Interface 1. Has anyone had any joy doing this with an emulator…

    [quote="jp;847528"]Above, tstih mentions his ... transfer.

    Note that even with background operation it is ...
    tstih tstih February 2016 Development
  • 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…

    ... , loops and branches made with JP instructions aren't really 'nested ... it from disassembled code is even harder, though skoolkit makes a ...
    guesser guesser March 2016 Development
  • 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 …

    ... it's using the stack. Even if MegaLZ itself doesn't ... /> LD (zx7ret+1),HL
    JP zx7
    returnaddress:

    JP (labelled zx7ret).
    FrankT FrankT April 2016 Brand new software
  • Function with push and popIm trying to see if I understand push and pop when it comes to using to pass parameters to functions: [code] LD HL,16384 LD A,5 Push AF Ld A…

    [quote="slenkar;857988"]Ah yes JP(hl)

    So using ... tend to prefer POP IX, JP(IX) if I'm doing ... HL free for other things. Even indexing using HL is usually ...
    AndyC AndyC April 2016 Development
  • Let's copy buffers!Figured I'd do some double buffered graphics, so I can render for several frames before displaying stuff. Yes, I mean on a 48k speccy, so no 128k spe…

    ... /> Is that still the case even if your code for the ... ...
    ;
    ldi

    jp pe,copy_loop[/code]
    Mysterion Mysterion April 2016 Development
  • Games featuring... relevant bugsThere was a recent improvement to the WoS database in order to classify [URL="http://www.worldofspectrum.org/forums/showthread.php?t=34261"]Games fea…

    ... alternative would work better, or even if it's worth it ... : sbc hl, de
    cb22: jp nz, $cb28
    cb25 ...
    Bandit Bandit May 2016 Infoseek database
  • Bored of the Rings coded messageI was browsing [url="https://tcrf.net/"]The Cutting Room Floor[/url] recently and stumbled upon the entry for [url="https://tcrf.net/Bored_of_the_Rin…

    ... the two lines marked "**"), with even worse results, as that produced ... /> pop hl ;**
    cp " "
    jp z,OK34
    cp "!"
    cp "A"
    jp c,CNEXT
    cp "Z ...
    Battle Bunny Battle Bunny June 2016 Games
  • ZX Dandanator! Mini - Cartridge system for SpectrumsHi All, I'd like to present a little HW I've developed during the last three months. It's aimed at providing a console-like usage experience for a…

    ...
    BEFORPUL1: JP BEFORPUL2 ; JP, 10 ts
    BEFORPUL2: JP BEFORPUL3 ; JP, 10 ts ...
    BEFORPUL3: JP BEFORPUL4 ; JP, 10 ts ... 128K bank switching register. Hack, even if it took 10 times ...
    RMartins RMartins July 2016 Hardware
  • what other hobbies do you have?I mean we are all here, because of retro gaming / spectrum etc.. but what other hobbies do you have? (inspired by another thread that mr cpczone wa…

    ... it up for me too JP.

    As for hobbies ...
    moggy moggy July 2016 Chit chat
  • 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…

    ... PE if the result has even number of set bits (2 ... a, %00001111
    sla
    jp p, xxx
    [/code]
    sla
    jp p, xxx
    [/code]
    Bedazzle Bedazzle September 2016 Development
  • Optimized (in size) Z80 simulatorI am evaluating Z80 simulators to try to create a tool to analyse z80 programs. I'd like to start with a simple register coverage tool and t-state cy…

    ... HL) ; fetch highbyte
    JP (HL) ; jump to opcode ... br />
    #6100
    JP I00 ; do opcode #00
    #6202
    JP I02 ; do opcode #02
    JP I01 ; do opcode #01

    This can even be ... faster when in stead of the JP ...
    Dr BEEP Dr BEEP September 2016 Development
  • Optimized (in size) Z80 simulatorI am evaluating Z80 simulators to try to create a tool to analyse z80 programs. I'd like to start with a simple register coverage tool and t-state cy…

    ... . And that's before you even start to consider weird program ... flows like POP AF; JP Z, somewhere; PUSH HL; RET ... becomes variable)

    5) JP (IX) f.e. Where does ...
    AndyC AndyC September 2016 Development
  • Optimized (in size) Z80 simulatorI am evaluating Z80 simulators to try to create a tool to analyse z80 programs. I'd like to start with a simple register coverage tool and t-state cy…

    ... . And that's before you even start to consider weird program ... flows like POP AF; JP Z, somewhere; PUSH HL; RET ... instruction becomes variable)
    5) JP (IX) f.e. Where does ... 5. You can't do JP HL. But you can do ...
    tstih tstih September 2016 Development
  • Proportional fontsI've been doing some proportional font drawing, purely on C level at the moment, but it's orders of magnitude slower than I'd want it to be. It's sti…

    ... , unique for each shifter
    jp (ix) ;IX = .put

    even a 8x8 routine would be ...
    Hikaru Hikaru October 2016 Development
  • The state of source level debuggingI was just wondering if we can put on a table everything we collectively know about source level debugging for ZX Spectrum to get an overview of curr…

    ... hl
    call dbgboot
    jp 0x335b ; calculate in ROM
    (3) jp nc,buggy ; called from RAM ... /> Seems possible, perhaps can be even squeezed to printer buffer.
    tstih tstih November 2016 Development
<1…21222324252627…34>

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