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  • How to stop a flickering character erasure?I'm trying to figure out how to build a moving sprite. Eventually it will be made up of several UDG's. However its early days yet so I'm experimentin…

    ... />
    I then shift the graphic 1 pixel to the right and ... UDG "C" and UDG "D" shift again gives "E" and "F ...
    mik3d3nch mik3d3nch May 2018 BASIC
  • Kempston Mouse DriverHi Folks, Does anyone know the email of Chris Cowley who wrote the Kempston Mouse Driver in the WOS Archive? Many thanks Paddy

    ... br /> ; IX = points to 8x16 pixel sprite + mask

    ... XOR offset to get left shift offset
    LD B,A ... /> next_spr_row
    INC IX ; Shift IX to point at the ... data
    CALL _get_next_row ; Shift HL to point exactly one ...
    Paddy Coleman Paddy Coleman September 2018 Hardware
  • Which game(s) had the worst colour clash?I remember colour clash was the bane of the spectrum, but are there any cases where it was particularly bad/good? I remember that R-Type seemed ve…

    ... of the sprites are being pixel-masked onto the background, but ... at random. No attempt to shift the details like helmets or ...
    joefish joefish October 2018 Games
  • Printing text, part MMXIIXI'm pretty sure there's been a zillion threads about this already, and I don't think it's the first one by myself either, but here goes. Proportiona…

    ...

    ; increment pixel offset
    ld a, c ... exx
    ; keep pixel offset within a byte
    ld c,b ; new pixel offset
    bit 3, ... data, 2 bytes per shift position.

    Sol_HSA Sol_HSA December 2018 Development
  • Printing text, part MMXIIXI'm pretty sure there's been a zillion threads about this already, and I don't think it's the first one by myself either, but here goes. Proportiona…

    ... , I figured I could just shift the pixels one at a ... tested a bunch of 8 pixel high fonts and aside from ...
    Sol_HSA Sol_HSA December 2018 Development
  • Proportional-width fontsFor reasons that are still not quite clear to me (because I’ve always loved typography and design,) I never bothered to write a proportional-font rou…

    ... /> dec a ;reduce by 1 pixel, so glyphs flush with right ...

    inc d ;shift one pixel down, as we're only ...
    ex af,af' ;restore pixel position (number of shifts) into ...
    char_shift
    rr c ;shift through Carry
    rra
    Ast_A_Moore Ast_A_Moore December 2018 Development
  • im looking for other games like the muncher that use double height and width graphics with colouri havent come across this type of graphics mode on the spectrum before and would like to know if there are any other games that use it.

    ... splitting a byte into two four-bit patterns, then interleaving them ... ,3,0,4,0 then shift it right and OR with ... ,0,7,0,8 then shift it left and OR again ...
    joefish joefish July 2019 Games
  • Vote for nationalised health care.Place your vote for nationalised health care in the USA. BTW: its quite clear this site is run by those with vested interests in blocking Obama's he…

    ... . My job was the night shift. Even though the place had ... square stairwell linking all three/four floors of the place, the ...
    Scottie_uk Scottie_uk August 2019 Chit chat
  • Fuse/SPIN vs Spectaculator border timingsHello, I'm trying to figure out at which moments the 48K ULA samples the current border color into its internal latch. To do that I wrote a small …

    ... by the length of eight-pixel chunks in ticks, which is ... it seems the division by four masks the fact that it ... -state at which the first pixel of the screen area is ...
    kosarev kosarev October 2019 Emulators
  • Keyboard (simultan pressed keys) Test Program in MCode like Vyacheslav Strunov´s Port demo v3.1Anybody here knows of another good Keyboard Tester program (for simultanous pressed keys and in Machinecode) like this: Port Demonstration 3.1 by Vy…

    ... of the rectangle: [b]Symbol Shift[/b] (in red below).
    four rectangles for the phantom keys ...
    colonel32 colonel32 November 2019 Hardware
  • Keyboard (simultan pressed keys) Test Program in MCode like Vyacheslav Strunov´s Port demo v3.1Anybody here knows of another good Keyboard Tester program (for simultanous pressed keys and in Machinecode) like this: Port Demonstration 3.1 by Vy…

    ... of the rectangle: [b]Symbol Shift[/b] (in red below).
    four rectangles for the phantom keys ...
    Luzie Luzie November 2019 Hardware
  • What to write / programme?I've been trying to get back some motivation to write something in machine code for the Spectrum. I don't feel I am organised enough to write somethi…

    ... usually settle for 2 pixel scrolling (2 pixel precision). This is a ... -rotation (an extra char to shift into), so 40 bytes x ... address we move down one pixel line in the display file ... /> INC D ; move down a pixel line in the display file ...
    dmsmith dmsmith March 2020 Development
  • 50+ FPS GAMESHi guys) Which was the first Speccy game with 50/60 frames per second? And what was the main reason? Thank you

    ... LEDs/LCDs with those sub-pixel smoothing know-how’s.
    four[/i] pixels can be done ...
    Ast_A_Moore Ast_A_Moore April 2020 Games
  • What to write / programme?I've been trying to get back some motivation to write something in machine code for the Spectrum. I don't feel I am organised enough to write somethi…

    ... you will see there are four levels of nested loops. The ... next loop (four iterations) repeats these two pixel lines four times to fill ...
    dmsmith dmsmith April 2020 Development
  • Mighty Maths ProgramsIn a break from typing in listings from 37-year-old magazines, I had a sudden urge to write a maths-related program, as I do, occasionally. Some, suc…

    ... its screen - albeit in only four colours, but where accuracy is ... are produced by CTRL+SHIFT+A, CTRL+SHIFT+B, and so on ...
    The Mighty Dopethrone The Mighty Dopethrone October 2020 Sinclair Basic
  • Bit of fun - ToastRack , one change onlyAlthough there's an old "one change only" topic about, I was thinking about the toastyrack 128's earlier. Its actually the only Spectrum model I've n…

    ... . So that we have potentially four 'attributes' settable per "8x8 block ... range of graphic capabilities. The pixel resolution remains the same.
    spider spider November 2020 Hardware
  • CSSCGC 2021: 25th edition extravaganza![img]https://csscgc2021.files.wordpress.com/2020/12/yellow_programmer_960x600.png[/img] [url=https://www.rickdangerous.co.uk/csscgc2021/][b][size=…

    ... /review001.html]P.P.S. - Pixel Perfect Shot[/url] for the ... />

    PROSM still has four reviews to write from the ...
    The Mighty Dopethrone The Mighty Dopethrone January 2021 Games
  • Corona Virus,Is is me or is the BBC sensationalizing this corona virus too much and creating hysteria?

    ... you are actually an essential shift worker. Only actual key workers ... . And exercise within three to four miles of your home.
    four days before your isolation ends ...
    1024MAK 1024MAK January 2021 Chit chat
  • z88dk sp1 Scene EditorHi, I've been developing for the last couple of weeks a scene editor (tile editor + scene tile placement+ export to c sp1 compatible) to aid me in…

    ... {

    my $zxattr = shift; # zx spectrum ATTR FBGRBGRB data ... {

    my $zxpixels = shift; # zx spectrum pixel byte data ( 8 bits ... )
    my $zxattr = shift; # zx ...
    dbolli dbolli January 2021 Development
  • Sleep aids?For years I have had problems sleeping, mostly getting to sleep (it can take me half a night sometimes) and staying asleep or getting into deep sleep…

    ... will take between one and four hours before your bladder wants ... lag is. Round the clock shift workers and night time workers ...
    1024MAK 1024MAK August 2021 Chit chat
  • Were the full Sinclair Loki specs ever actually known?I was just curious. A lot was leaked to the media, but the exact specs seem different depending on source. Some say it could support up to 512x256 an…

    ... .
    256*200*RGBI ( four bits per pixel )
    256*200*RRGGBBPP ... pixel, 4 intensity per pixel, 4 sprite planes )
    512*200*RGBI ( four ... bits per pixel )

    Stated, but ...
    cj7hawk cj7hawk August 2021 Hardware
  • Stupid bugs in gamesDid any one discover bugs in any game. I found out in Football Manager 1 you can sell all your players and still play matches (and even win them)

    ... thousand cups of coffee, and four cats, roughly three cigarettes, a ... you simply held down Symbol Shift.
    Vampyre Vampyre August 2021 Games
  • CSSCGC 2021: 25th edition extravaganza![img]https://csscgc2021.files.wordpress.com/2020/12/yellow_programmer_960x600.png[/img] [url=https://www.rickdangerous.co.uk/csscgc2021/][b][size=…

    ... February. In cases like [i]Pixel Perfect Shot[/i], where there ... be one Spectrum game and four on the ZX81, for which ...
    The Mighty Dopethrone The Mighty Dopethrone September 2021 Games
  • Were the full Sinclair Loki specs ever actually known?I was just curious. A lot was leaked to the media, but the exact specs seem different depending on source. Some say it could support up to 512x256 an…

    ... an architecture like this with four small gate arrays.

    pixel register in the decode handles ... byte or 6 bits per pixel, all while adjusting the rate ...
    cj7hawk cj7hawk October 2021 Hardware
  • How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…

    ...
    .loop:
    ; blit 8 pixel row to screen
    ld ...
    .loop:
    ; blit 8 pixel row to screen
    ld ...
    .loop:
    ; blit 8 pixel row to screen
    ld ...
    ; point DE to the shift buffer
    ld de, shiftdata_lbuff ...
    Paradigm Shifter Paradigm Shifter June 2022 Development
  • How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…

    ... /> .loop:
    ; blit 8 pixel row to screen
    ld ... br /> ; point DE to the shift buffer
    ld de, shiftdata_lbuff ... /> .loop:
    ; blit 16 pixel rowdata to screen in cells ... br /> .loop2:
    ; blit 16 pixel rowdata to screen in cells ...
    Paradigm Shifter Paradigm Shifter June 2022 Development
  • How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…

    ... frames of 16x16 graphics then shift over 1 column (8 pixels ... the player) is done per pixel.
    Paradigm Shifter Paradigm Shifter June 2022 Development
  • How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…

    ... ;next
    push hl ;these four push instruction stores 8 bytes ... ;next
    push hl ;these four push instruction stores 8 bytes ... ;next
    push hl ;these four push instruction stores 8 bytes ...
    Kotek Kotek July 2022 Development
  • Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…

    ... being pressed
    ; #FE - SHIFT, Z, X, C, & ... .loop:
    ; blit 16 pixel rowdata to screen in cells ... br /> ; blit 16 pixel rowdata to screen in ... .loop:
    ; blit 16 pixel rowdata to screen in cells ... br /> ; blit 16 pixel rowdata to screen in ...
    Paradigm Shifter Paradigm Shifter July 2022 Development
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