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<1…20212223242526…34>
  • 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…

    ... off & YELLOW
    jp sa_start ; immediate jump
    ... a ; jump back even at zero
    jp nz, sa_loop ; ... /> ld c, a ;
    jp ld_dec ; immediate jump

    jp nc, ld_8_bits ; jump until ...
    chev chev October 2013 Development
  • 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…

    ... :
    bit 0, b ; even pass through loop?
    jr ... b ; subtract B
    jp m, pf_out_lp ; jump if digits ... a ; test sign
    jp p, pf_e_pos ; jump if positive ... 0 ; exponent to BC
    jp out_num_1 ; immediate jump
    ...
    chev chev October 2013 Development
  • 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…

    ... /> ldir ; clear even columns
    ret ... ; reduce counter
    jp cls_3 ; immediate jump
    chev chev November 2013 Development
  • Documentation for SP1 for Z88DK?(I was going to post in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=11729"]the other thread[/URL], so if a mod thinks this should go…

    ... , you can't have the jp located at $d4d4 because that ... the table and 3-byte JP instruction, the table must start ... to poke a 3-byte JP instruction so the z80 will ... the hardware is, we cannot even be sure what byte the ...
    Alcoholics Anonymous Alcoholics Anonymous November 2013 Development
  • Cross platform developmentI'm just vaguely considering supporting a few more retro 8 bit platforms for something I have in mind to do. Just Z80 and 6502 really, but that cove…

    ... string
    or e
    jp z, stdio_error_zc

    .....
    even handle inline asm, so you ... it only does that once even if your program is spread ...
    Alcoholics Anonymous Alcoholics Anonymous November 2013 Development
  • FZX Driver for z88dkAn fzx library for z88dk can be downloaded [URL="https://drive.google.com/file/d/0B6XhJJ33xpOWM2hWNjAxMVkxaEk/edit?usp=sharing"]here[/URL]. The libr…

    ... of the most bottom row. Even though the font is only ... char draw off screen?
    jp nc, error_zc - 2 ; return 0 ...
    Alcoholics Anonymous Alcoholics Anonymous December 2013 Announcements
  • Why?I'm just wondering why people are here? Why are we working on or using old hardware? Why are some of you putting a lot of effort in upgrading the ha…

    ... , but keeps it simple. But even there I tend to prototype ... code, but goto and jp etc were even more dangerous in the ...
    David Jones David Jones December 2013 Sinclair Miscellaneous
  • Why?I'm just wondering why people are here? Why are we working on or using old hardware? Why are some of you putting a lot of effort in upgrading the ha…

    ... , but keeps it simple. But even there I tend to prototype ... code, but goto and jp etc were even more dangerous in the ...
    spectrumlinux spectrumlinux December 2013 Sinclair Miscellaneous
  • Legalities of using Spectrum game screenshot/tape covers.I'm working on an HTML5 game, which would be based in the 1980's and would allow the player to 'play' Spectrum games (not actually play them, you'd j…

    ... is completely different. However, as Gasman has said, the actual chance ... owner doing anything about it, even if they were aware of ...
    chev chev December 2013 Sinclair Miscellaneous
  • Assembly code auto optimiserFor my Finders Keepers Plus project I'm considering writing an Assembly code auto optimiser. Way back when I wrote the original FK I considered optim…

    ... Saukas;740625]About automatically replacing JP with JR, notice it can ... single step. Perhaps a certain JP is too far away so ... this distance so the original JP can be replaced with JR ... the Transputer chip it's even more the case there. The ...
    David Jones David Jones December 2013 Development
  • Assembly code auto optimiserFor my Finders Keepers Plus project I'm considering writing an Assembly code auto optimiser. Way back when I wrote the original FK I considered optim…

    ... . A "call x; ret" to "jp x" is one humans sometimes ... preferring to use subroutines for even mundane tasks but sdcc has ...
    Alcoholics Anonymous Alcoholics Anonymous December 2013 Development
  • Assembly code auto optimiserFor my Finders Keepers Plus project I'm considering writing an Assembly code auto optimiser. Way back when I wrote the original FK I considered optim…

    ... jump optimiser :)[/QUOTE]

    Even so, using multiple passes is ... example:

    [CODE]p1: jp c, p2+128
    p2 ... : jp z, p3-130
    p3:[/ ... . You cannot change the first JP (to JR) without changing the ...
    Einar Saukas Einar Saukas December 2013 Development
  • IF1bis vs SpectranetSince I will shortly have access to both an IF1bis (which I've bought) and a Spectranet (thanks to a loan from cmonkey), I will be in a position to g…

    ... (it's all based on gasman's sample code) from a ... and delta compression. Uncompressed audio, even 4 bit @11200 has a ... bitrate and video is obviously even worse :)
    guesser guesser December 2013 Hardware
  • IF1bis vs SpectranetSince I will shortly have access to both an IF1bis (which I've bought) and a Spectranet (thanks to a loan from cmonkey), I will be in a position to g…

    ... 'll do it fast enough even using the API and not ... />
    I don't think Gasman's video player for the ... the IF1bis will have over Gasman's player is presumably you ...
    Winston Winston December 2013 Hardware
  • IF1bis vs SpectranetSince I will shortly have access to both an IF1bis (which I've bought) and a Spectranet (thanks to a loan from cmonkey), I will be in a position to g…

    ... 'll do it fast enough even using the API and not ... /> [QUOTE]I don't think Gasman's video player for the ... the IF1bis will have over Gasman's player is presumably you ...
    Dan Antohi Dan Antohi December 2013 Hardware
  • Something you seen the spectrum do that impressed you?It can be coding related, graphics etc.... From me... Turbo loaders, graphic masking, the last of the lerm tape copier coding that could do speedloc…

    ... /> - Rainbow effects still impress me even now... can't recall where ... really was pure beeper...
    - Gasman's Wav2AY sample engine... This ... had been there for ages... Gasman's code made it easy ...
    kgmcneil kgmcneil December 2013 Games
  • Thumbnail icon of TZX in Mac OS X FinderI only noticed this today on my Mac that for some TZX files (presumably with standard tape loaders) I can see a preview of the loading screen as a th…

    ... manual below.

    As gasman says it already works for ... date.

    You can even embed cover art in TZXs ...
    Fred Fred January 2014 Sinclair Miscellaneous
  • DIM DATA and the likeSo...I'm trying to work out arrays in BASIC a bit more and have knocked up the following quick test bed to fiddle about with before trying anything m…

    ... , for the majority of programs even in Z80 you can do ... :-

    ld , : LET =
    jp , : IF GOTO
    inc or ...
    David Jones David Jones January 2014 Sinclair Basic
  • ****ing Awesome Spectrum Engine (FASE)This is a new engine (sprites, tiles, map) for all ZX Spectrum machines. The engine set ups a runtime enviroment that leave between 24K and 30K byt…

    ... relocatable sprites
    5bf8 even frame $00 or odd frame ... relocatable sprites
    fff1-fff3 jp to frame routine
    ... code
    fffc-fffe jp to init routine
    ... relocatable sprites
    fff1-fff3 jp to frame routine
    ...
    antoniovillena antoniovillena January 2014 Brand new software
  • mirroring bitsIf I have a string of 1408 bytes, each of which has one bit 'b' set, what's the shortest way of mirroring that string, so that each bit set at positi…

    ... (hl),a
    cpi
    jp pe,.lp0
    ret
    ldi
    jp pe,.loop
    ret[/code ... nc,.lp1
    ldi
    jp pe,.lp0
    ret[/code ... , the jump condition is 'parity even'.
    Hikaru Hikaru January 2014 Development
  • mirroring bitsIf I have a string of 1408 bytes, each of which has one bit 'b' set, what's the shortest way of mirroring that string, so that each bit set at positi…

    ... l,a
    ldi
    jp pe,.lp0
    ret[/code ... , the jump condition is 'parity even'.[/QUOTE]

    I just ...
    Einar Saukas Einar Saukas January 2014 Development
  • Please explain how a Kempston interface circuit works.Can someone help me understand how a Kempston joystick interface works, as I want to design and build my own as an experiment. I understand switches…

    ... until recently, I wasn't even aware those resistor packages came ... just does IN A,(254) / JP $-2 forever?
    joefish joefish January 2014 Hardware
  • Spectrum Games with Nazisit seems the right day. [B]"rick dangerous"[/B] third level. of course [B]"indiana jones and the last crusade"[/B]. and there must be a lot of text…

    [QUOTE=gasman;749878]Wolfenstein 2004.
    (And ... I dunno if it's even real. Q/A keyz only ...
    Yerzmyey Yerzmyey January 2014 Games
  • Questions about SEUDI recently purchased SEUD (Shoot-em-up Designer, for those who do not know it) from Cronosoft and tried to familiarize with it, also by peering into …

    ... screen. The bug is noticeable even in Damage (the example ... would need to insert two JP NN instructions to addresses ... BFDB CA 55 05 accb1 jp z,1365 ; collect bonus ... BFDE C3 55 05 accb2 jp 1365 ; collect bonus 2 ...
    jonathan jonathan March 2014 Development
  • Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…

    ... circuit. But there is even better indication. My alignment ... t-states circle inc a:jp (hl) and records after ... I meant was that even the most demanding demos ... fine in all emulators, even if obviously most of ... actually looking at an even more subtle issue: when ...
    introspec introspec March 2014 Emulators
  • JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…

    I didn't even know JP (HL) existed at all.. :lol:< ...
    Morkin Morkin March 2014 Development
  • JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…

    [QUOTE=Morkin;759702]I didn't even know JP (HL) existed at all.. :lol:
    [/QUOTE]

    Don't overlook JP(IX) and JP(IY) too. I use JP(IX) a lot with IX acting like a function pointer.
    Alcoholics Anonymous Alcoholics Anonymous March 2014 Development
  • JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…

    ... 's always worth remembering that JP (HL) takes only 4 t ... a succession of CP n/JP nn would take far longer ... HL with a value first. Even if you have a jump ... don't forget that any JP (HL) need a PUSH ... your code.

    JP (HL) and JP (IX) are used in ...
    PokeMon PokeMon March 2014 Development
  • JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…

    ... , COLLIDE_BOTTLE
    cp 8
    jp z, COLLIDE_BOMB

    ... flip A to L
    JP (HL) ; do the jump to ...
    [QUOTE=PokeMon;760004]JP (HL) and JP (IX) are used in ... of people on this forum. Even on that machine, as ...
    bobs bobs March 2014 Development
  • JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…

    ... /> DEFB 0
    JP floortile ; 4
    ... /> DEFB 0
    JP bottle ; 12
    ... DEFB 0
    JP bomb ; 16
    ... this could be even executed in 28 ...
    PokeMon PokeMon March 2014 Development
<1…20212223242526…34>

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