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<1…15161718192021…34>
  • Minigame Compo 2007Hi there, also this year, there'll be a minigame competition, open to all 8-bit computers and consoles. It consists on writing games whose size (…

    ... />
    [CODE]
    LD H,(IX+0E) If a line ... number was
    LD A,H specified then it ... amp; NSPPC.
    LD (NEWPPC),HL
    LD (NSPPC),+00
    Paolo Ferraris Paolo Ferraris January 2008 Development
  • Minigame Compo 2007Hi there, also this year, there'll be a minigame competition, open to all 8-bit computers and consoles. It consists on writing games whose size (…

    ... /> [code]

    ld hl, data
    exx
    ld (de),a ; first time no ... de
    next
    ld b, 9
    next1
    dolz ld h, b ;GET OFFSET
    ld l, a
    ld (de),a is 'incorrectly' ...
    Paolo Ferraris Paolo Ferraris January 2008 Development
  • New protection systemsAs a follow-up to [URL="http://www.worldofspectrum.org/forums/showthread.php?t=14311&page=2"]this[/URL] thread regarding relatively new protection sy…

    ... this?

    [CODE]
    LD B,(HL)
    INC HL ... ,(HL)
    INC HL
    LD H,(HL)
    LOOP RR (HL ...
    Patrik Rak Patrik Rak February 2008 Development
  • help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…

    ... for pixel row copy
    ld h,d ; now need to get ... above

    ld a,h
    dec h
    and $07 ; ... by adding 8
    ld h,a
    ld a,l
    sub ... block)
    sub $08
    ld h,a

    .enter
    Alcoholics Anonymous Alcoholics Anonymous February 2008 Development
  • problem using FRAMES to generate 'random' numbersI realise the pros use bytes from ROM to get their random numbers, presumably because they want to use FRAMES to synchronise the printing and avoid s…

    ... /> [code]
    randommove
    ld a,(23672) ;lsb of FRAMES ... five bits
    ld b,a
    ld c,a
    ld a,h
    and #3f ; keep pointer in ROM
    ld h, ... a
    ld (23672),hl
    ld a,(hl)< ...
    Dr BEEP Dr BEEP March 2008 Development
  • Collision Detection in SP1Hi, Does anyone have a well-documented example of using collision detection in spritelib. I've search WoS and Z88DK forums but no joy. Something wi…

    ... /> and $07
    ld h,a ; h = vertical rotation 0-7< ... /> add a,h ; add vertical rotation
    ld b,a ; ... /> and $07
    ld h,a ; h = vertical rotation 0-7< ...
    Alcoholics Anonymous Alcoholics Anonymous March 2008 Development
  • Emulators on the ZX SpectrumHaving released a Spectrum 16K emulator for Spectrum 48/128 machines as part of CCG2008, I was wondering if anybody knows of any emulators which actu…

    ... I have to :
    LD HL,(vpc)
    INC HL ...
    LD (vpc),HL
    ...which ... LD L,A
    LD H,B ; Point to instruction in table
    LD H ... /> EX AF,AF'
    LD A,B ; Do command (here ...
    Dr BEEP Dr BEEP March 2008 Emulators
  • MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…

    ... />
    ================================================

    LDIR ld (DMAS),hl ;write source adress ... of block -1 !!!
    ld (DMAL),bc ;write correct length ... of DMA sequence
    ld bc,LDMA*256+107 ;register B = ...
    velesoft velesoft April 2008 Development
  • Interface 1 emulation issuesFor Virtual Spectrum v3.0 I am implementing virtual Interface 1 and Interface 2 options! The I/F2 ROM option works already, and I have got the I/F1 s…

    ... /> ld (err_sp),sp
    ld bc,0
    ld hl,gethook
    ld de ... de
    xor h
    ld h,a
    ld b,8
    crcbyt ...
    ld a,h
    xor $10
    ld h,a
    ld a,l ...
    xor $21
    ld l ...
    jp jp April 2008 Emulators
  • IF2 Rom snapshot creationHi, is it possible convert a Speccy 16k snapshot to a Interface 2 Rom file? I've the original Ultimate Pssst, Cookie, Trans-am and Jetpac tapes and …

    ... ;preserve HL again
    LD H,D
    LD L,E
    CALL ... ' '+$80
    LD H,D
    LD L,E
    LD (reloc1+1),HL ... ' '+$80
    LD H,D
    LD L,E
    LD (reloc2+8),HL ... "
    DEFB ' '+$80
    LD H,$00
    LD L,D
    CALL ...
    Jimmy Jimmy April 2008 Emulators
  • [WANTED] ASM routinesHi there, 1.) i really need 5-6 working and well commented routines, showing assembler capabilities. They should be simple, but not too much complic…

    ... 100
    ; H = quotient
    ; A = remainder
    LD H,0FFH ;start quotient ... at -1

    d100lp INC H ;add ... L = low byte, H = high byte
    LD L,A
    RET ... hexadecimal to 255 BCD
    LD A,0FFH
    CALL ...
    JuPo JuPo June 2008 Emulators
  • [WANTED] ASM routinesHi there, 1.) i really need 5-6 working and well commented routines, showing assembler capabilities. They should be simple, but not too much complic…

    ... and operands" when i use "LD HL, D"[/QUOTE]


    LD H,0
    LD L,D

    piters piters June 2008 Emulators
  • VIC 20 emulation on the SpectrumI'm sure most people are aware of the my attempt at bringing the full Commodore experience to Sinclair users with the "Twenty Commodes" program. It e…

    ...
    LD A,(DE)
    LD L,A
    LD H,B
    LD H,(HL ...
    Dr BEEP Dr BEEP August 2008 Sinclair Miscellaneous
  • Bresenham's line algorithmHelp - I really am struggling to get my head around this algorithm. I don't know why, I coped with Cordic (SIN/COS) and integer divide routines (/10 …

    ... push bc

    ld H,0
    ld L,B
    rlc ... /> add A,H
    ld c,A
    ld A,E
    sub H
    ld c,A

    ... />


    ld A,H ;is the circle finished ?
    ld B,A
    ld A,H
    bit 7 ...
    rtunes rtunes September 2008 Development
  • Bresenhams circle algorithmI post here my final circle code to replace, if you want, the one in the ROM. It only uses integer math and runs very fast and is very compact. It is…

    ... parameters***********
    ;*************************************
    ld h,0 ;H is x ; init to 0 ... /> add A,H
    ld c,A
    ld A,E
    sub H
    ld c,A
    call ... ***********
    Control:
    ld a,h ;H is x
    cp l ...
    rtunes rtunes September 2008 Development
  • CSSCGC 2008 has now officially begunFor coming last in the 2007 crap game compo, I have the honour and privilege of hosting CSSCGC 2008! I have now put up the CSSCGC 2008 website at …

    ...
    ld de,$ffff
    ld h,d
    ld (hl),d
    ld bc ... ]It relies on skipping the LD B,A instruction at $11CB ...
    Jimmy Jimmy September 2008 Games
  • CSSCGC 2008 has now officially begunFor coming last in the 2007 crap game compo, I have the honour and privilege of hosting CSSCGC 2008! I have now put up the CSSCGC 2008 website at …

    I've tried to beat 12 bytes and the best I can do is 13. My 11 byte attempt doesn't fulfill all the criteria (doesn't clear the last
    Jimmy Jimmy September 2008 Games
  • BASin r14c - maintenance releaseAfter the recent discussions, BASin has been released as version 14c. It's only a maintenance release, and some of the really big new features are un…

    ... Random Seed
    LD HL,$D0D0
    LD (SEED),HL < ...
    CALL RAND16
    LD A,H

    ; ... Send it to the target port
    LD ... LD DE,0 ; Seed is usually 0
    LD A,D
    LD H ... ,E
    LD L, ...
    Digital Prawn Digital Prawn September 2008 Emulators
  • Spectrum AssemblyHi All, Thanks for letting me in... lol Over the last couple of days I started playing my spectrum emu again and then I started thinking about lear…

    ... videoram.

    INC H
    LD A,H
    AND 7
    RET NZ
    LD A,L ... C
    LD A,H
    SUB 8
    LD H,A
    RET ...
    omega omega October 2008 Sinclair Miscellaneous
  • Spectrum AssemblyHi All, Thanks for letting me in... lol Over the last couple of days I started playing my spectrum emu again and then I started thinking about lear…

    ... videoram.

    INC H
    LD A,H
    AND 7
    RET NZ
    LD A,L ... C
    LD A,H
    SUB 8
    LD H,A
    RET ...
    Shadow Maker Shadow Maker October 2008 Sinclair Miscellaneous
  • Spectrum AssemblyHi All, Thanks for letting me in... lol Over the last couple of days I started playing my spectrum emu again and then I started thinking about lear…

    ...
    ld ix, lines
    nextln: ld l, (ix+2)
    ld h, (ix ... +3)
    ld e, (ix+0)

    [CODE] ld a, (height)
    ld ix, lines
    ld hl, (y_off ... +2)
    ld l, a
    ld h, (ix+3)
    ld a, (x_off ...
    Matt_B Matt_B October 2008 Sinclair Miscellaneous
  • Spectrum AssemblyHi All, Thanks for letting me in... lol Over the last couple of days I started playing my spectrum emu again and then I started thinking about lear…

    ... lines
    ...
    ld hl, (lines+382)
    ld de, (lines+380 ... in the registers, like LD HL, 16384: LD DE, 16640 and so ... />
    [CODE] ld a, (height)
    ld ix, lines
    ld hl, (y_off ... +2)
    ld l, a
    ld h, (ix+3)
    ld a, (x_off ...
    Shadow Maker Shadow Maker October 2008 Sinclair Miscellaneous
  • Screen access in assemblerI am again troubled by the unusal screen design of the Spectrum. :) If I want to do something with, say, a 16x16 bit block of the screen (in the sam…

    ... /> [code]uphl:
    inc h
    ld a,h
    and 7
    ret nz
    ld a,l ... c
    ld a,h
    sub 8
    ld h,a
    ret ...
    gasman gasman November 2008 Development
  • Screen access in assemblerI am again troubled by the unusal screen design of the Spectrum. :) If I want to do something with, say, a 16x16 bit block of the screen (in the sam…

    ... H
    LD A,H
    AND 7
    JR NZ,OK
    LD H ... ,64
    LD A,L
    ADD ... A,32
    LD L,A
    OK:
    H isn't needed
    Dr BEEP Dr BEEP November 2008 Development
  • Screen access in assemblerI am again troubled by the unusal screen design of the Spectrum. :) If I want to do something with, say, a 16x16 bit block of the screen (in the sam…

    ... /> [code]uphl:
    inc h
    ld a,h
    and 7
    ret nz
    ld a, ... c
    ld a,h
    sub 8
    ld h,a
    ret ... br />
    Gasman,

    H must be set back after ...
    Dr BEEP Dr BEEP November 2008 Development
  • Screen access in assemblerI am again troubled by the unusal screen design of the Spectrum. :) If I want to do something with, say, a 16x16 bit block of the screen (in the sam…

    ... Spencer Winsent
    inc h
    ld a,h
    and #07
    jr nz,.label
    ld a ...
    sub #e0
    ld l,a
    sbc a ... /> and #f8
    add a,h
    ld h,a
    .label[/code]
    Shiru Shiru November 2008 Development
  • Screen access in assemblerI am again troubled by the unusal screen design of the Spectrum. :) If I want to do something with, say, a 16x16 bit block of the screen (in the sam…

    ... Spencer Winsent
    inc h
    ld a,h
    and #07
    jr nz,.label
    ld a ... l
    sub #e0
    ld l,a
    sbc a ... #f8
    add a,h
    ld h,a
    .label[/code][/QUOTE ...
    Metalbrain Metalbrain November 2008 Development
  • ZX Spectrum (16K) sound/beepHi all, I think I'm in right place now, I've tried to find an answer how to generate two channel sound using ZX Spectrum 16K. Only think I've found …

    ... br /> INC IX
    LD H,(IX+1) ; Load the ... note length.
    LD H,(IX+0) ; H, L and D ... volume.
    LD C,A
    DEC H ; Decrement counter ... cycle.
    LD H,(IX+0) ; Re-load H with pitch ...
    Matt_B Matt_B November 2008 Sinclair Basic
  • Keyboard routinesI'll ask here first - since this must be a long-ago solved problem, and hopefully I can avoid re-inventing the wheel... I need a keyboard routine th…

    ... 0E, ENTER=#0D)
    LD H,B
    LD B,#04
    LPTR1 ... of table
    LD L,A ;
    LD H,#02 ;higher byte ... of table (#0205 for now)
    LD A ...
    Shadow Maker Shadow Maker January 2009 Development
  • Keyboard routinesI'll ask here first - since this must be a long-ago solved problem, and hopefully I can avoid re-inventing the wheel... I need a keyboard routine th…

    ... ; STORE RESULT TEMP
    LD H,B
    LD B,127
    IN ... byte of table
    LD L,A ;
    LD H,#02 ; higher byte ...
    Dr BEEP Dr BEEP January 2009 Development
<1…15161718192021…34>

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