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<1…24252627282930…34>
  • Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…

    I realise that this is pedantry of the highest order, but would it not be better to switch the sign of the accumulator with NEG rather than CPL:INC A ?

    It should save you a byte the next time you enter the minigame competition.

    :)
    jonathan jonathan August 2006 Development
  • Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…

    But NEG takes two bytes same as CPL+INC A :)
    Woody Woody August 2006 Development
  • Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…

    [quote=Woody]But NEG takes two bytes same as CPL+INC A :)[/quote]
    Tsk, what does Jonathan Cauldwell know about programming... :lol:
    rich_chandler rich_chandler August 2006 Development
  • Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…

    [QUOTE=Woody]But NEG takes two bytes same as CPL+INC A :)[/QUOTE]

    You're right, it does. For some reason I had it in my head that it was one byte.

    Ignore everything I just said.
    jonathan jonathan August 2006 Development
  • Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…

    ... with NEG rather than CPL:INC A ?[/QUOTE]
    i think ... CPL/INC and NEG differs in effect ...
    Fikee Fikee August 2006 Development
  • 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…

    ... the push hl / pop de / inc de if you make sure ...
    ld a,(ix)
    inc ix
    ld (hl),a ...
    gasman gasman August 2006 Development
  • 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…

    ...
    ld a,(de)
    inc de

    ld b ... />
    ld (hl),a : inc hl
    ld (hl),a ... />
    ld (hl),a : inc hl
    ld (hl),a ...
    ld (hl),a : inc hl
    ld (hl),a ... , "LD (HL),A : INC HL" could be replaced by ...
    Alcoholics Anonymous Alcoholics Anonymous August 2006 Development
  • Free music!!!Keep an eye on [url]http://spiralfrog.com/[/url] They have the backing of Universal Music and they have allowed their entire back catalogue to be do…

    ... a chance - Sponsored by Raytheon Inc.
    D.I.V.O ...
    ADJB ADJB August 2006 Chit chat
  • In Machine Code, what is the quickest way to sort bytes?I am playing around with some ordering of sprites, where I want to order them by vertical position. I used some Rodnay Zaks code to order some bytes…

    [QUOTE=Paolo Ferraris]This is a good point. Anyway, if sorting is needed then I'd strongly suggest, for sprite sorting, bubblesort over the other sorting methods: it is simple, uses few memory, and - more importantly - it is very fast for almost-sorted ...
    JamesD JamesD September 2006 Development
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... (L=1)
    Continue:
    inc ix
    djnz Loop
    JamesD JamesD September 2006 Sinclair Miscellaneous
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... , (hl) ; get a value
    inc hl ; move to next value ... /pop with a single inc, and the inc/dec hl instructions can ... also be replaced with an inc/dec l if the table ...
    Matt_B Matt_B September 2006 Sinclair Miscellaneous
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... : ld c,(hl)
    6 inc hl
    7 ld a ... jp nc,next
    4 inc e ; swap was done
    6 inc hl
    12/7 next ...
    Alcoholics Anonymous Alcoholics Anonymous September 2006 Sinclair Miscellaneous
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... say without running the versions (inc the plus4 one) that the ...
    Sard Sard September 2006 Sinclair Miscellaneous
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... optimized by replacing the "INC HL"s with "INC L"s.
    Alcoholics Anonymous Alcoholics Anonymous September 2006 Sinclair Miscellaneous
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... say without running the versions (inc the plus4 one) that the ...
    piters piters September 2006 Sinclair Miscellaneous
  • Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…

    ... is xbyte 2)
    inc h ; Move h to ... for this line
    inc h ; move to lo ... set hibyte from graphics
    inc h ; move to lo bytes ...
    Dr BEEP Dr BEEP September 2006 Development
  • Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…

    ... this is xbyte 2)
    inc h ; Move h to beginning ... byte of screenaddress

    inc h ; move to lo bytes ...
    Dr BEEP Dr BEEP September 2006 Development
  • Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…

    ... br />
    [code]
    inc (ix+4) ; increase counter
    inc hl
    ld b,(hl ... hl) ; bc = dx
    inc hl

    ex de ... ; bc = y coord
    inc hl
    ld a,(hl ...
    Alcoholics Anonymous Alcoholics Anonymous September 2006 Development
  • Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…

    ... this is xbyte 2)
    inc h ; Move h to beginning ... byte of screenaddress

    inc h ; move to lo bytes ...
    Dr BEEP Dr BEEP September 2006 Development
  • What the heck happened to Monkey Island?I wanted to play the original Monkey Island so I had a look on ebay and... WTF... ?80 for a white label reissue CD! Where did all the copies of MI g…

    no, not those.

    *goes to look at all the cd cases in the house

    [edit]
    AHA!

    Printmaster Gold UK VERSION, (c)1997 Mindscape inc

    I knew I'd seen the name before :-)
    guesser guesser September 2006 Chit chat
  • Did all Spectrum 128Ks have that large heatsink?Question as per title. I can't seem to find the answer to this. I'm sure I've seen a picture of one without it. Would this be because someone has car…

    ... /RARE-SPECTRUM-128K-33-GAMES-INC-MONSTERS-KONG-ATTICK_W0QQitemZ130027210024QQihZ003QQcategoryZ11994QQrdZ1QQcmdZViewItem[/url]
    patters patters September 2006 Hardware
  • Whatcha listening to now?I'm listening to Audioslave's Revelations album. Fantastic work! Belting it at 12 in the night! Neighbours must be going crazy! :lol: Also listening…

    punks not dread

    inc:- chaos uk, raw noise, red flag 77, poison idea, extreme noise terror, filthkick
    mel the bell mel the bell September 2006 Chit chat
  • Which arcade game do you wish...... had been converted to the spectrum? There`s a lot of people who seem to not like arcade convo`s but personally I loved most of them, I know they…

    ... +Wonder+Boy$&pub=^Activision+Inc$]Super Wonderboy in Monsterland[/url ...
    Hungry Horace Hungry Horace October 2006 Games
  • Your Speccy Games CollectionJust updated my Spectrum games list today after having a load of tapes lying around for months, managed to sort them out and I now have 1441 original…

    ... cars2 - titus, 1988 (double pack inc :- crazy cars)
    Cricket captain ... /> Compact office (4 seperate cassettes, inc :-database, home accounts, 3d electronic ...
    mel the bell mel the bell October 2006 Games
  • Spectrum Screen Memory MapWhat's the advantage (mistery?) behind ULA's spectrum screen memory interpretation? 6144 bytes divided into 3 blocks, 2048 bytes long. if you want t…

    ... screen address (or perform an INC H, or whatever).
    Not ...
    LD A, (HL)
    INC H
    LD L, (HL ...
    icabod icabod October 2006 Development
  • Spectrum Screen Memory MapWhat's the advantage (mistery?) behind ULA's spectrum screen memory interpretation? 6144 bytes divided into 3 blocks, 2048 bytes long. if you want t…

    ... doing LD HL,[first byte] / INC H / LD HL,[second byte ... ] / INC H...

    You can' ... .)
    [code]
    upde
    inc d
    ld a,d ...
    gasman gasman October 2006 Development
  • Spectrum Screen Memory MapWhat's the advantage (mistery?) behind ULA's spectrum screen memory interpretation? 6144 bytes divided into 3 blocks, 2048 bytes long. if you want t…

    ... move left/right by simple INC L / DEC L even if ... ... or we could just use INC HL in the 32nd increment ... we couldn't use simple INC H to move to the ...
    baze baze October 2006 Development
  • +2 ramdisk - access in machine codeHow can you access the ramdisk in machine code? I've got a +2, and it seems the ramdisk has never been properly utilised. It would be a handy little…

    ... />
    exx

    inc bc ; adjust byte counter

    inc l ; destination address++
    jr ... br /> exx

    inc l ; source address++
    jr ...
    Alcoholics Anonymous Alcoholics Anonymous October 2006 Development
  • Programs detecting Spectrum modelsHi. I'm curious about knowing how some speccy games detect if they are runnning in a 128k or 48k model. What tricks can be used to make this in a Spe…

    ...
    ld (hl),a
    inc a
    out (c),a ...
    baze baze October 2006 Development
  • Games that are impossible to complete due to bugs!I'm trying to compile a list of Speccy games that cannot be completed because of a bug (or simply bad programming)! Here's a few... [B]Frankie Goes …

    ... /> LDI
    INC HL
    INC DE
    INC HL
    INC DE
    LDI
    INC HL
    INC DE
    INC HL
    INC DE
    Mr. Anonymous Mr. Anonymous October 2006 Games
<1…24252627282930…34>

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