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<1…15161718192021…34>
  • Spectrum Screen RAM layoutHi there The spectrum screen layout is rather odd. It seems to be arranged into 3 256 byte groups. If I have an x (horizontal) coordinate (from…

    ... xcor 0-255 in case shifted sprites interests you, plus a ... light on comments.

    [code]
    ;
    xy2screen: ;arrive with ... ,e
    ret
    ;
    [/code]

    EDIT - oh hell ...
    R-Tape R-Tape December 2015 Development
  • mkloader - compressed loading screen makerI made a new tool, available on my github at: [url="https://github.com/jarikomppa/speccy"]https://github.com/jarikomppa/speccy[/url] The tool gene…

    ... the "lzfpack" & "mkloader" cpp code, neither of which would even ... - sprite compiler, compile sprites into code (quick to render, take lots ... )
    - spriteproc - sprite processor, generates shifted versions of sprites
    Sol_HSA Sol_HSA December 2015 Announcements
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... ?p=786222&postcount=407"]code snippet[/URL] provided by Goodboy ... Nuggetreggae.

    Donald's Alphabet Chase: When trying to pick ... TAP file, coming with source code, can be downloaded from [URL ...
    Alessandro Grussu Alessandro Grussu March 2016 Games
  • Unreleased modern Speccy games?Information about "classic" never released Speccy games is available in [url="http://www.tzxvault.org/time.htm"]this page[/url], or searching for [ur…

    Complete source code for the scrollable multicolour effect ... scenery so it can be shifted around from one frame to ...
    joefish joefish April 2016 Games
  • New Game: Sewer Rage[img]https://s31.postimg.org/ulo8tuzyj/sewer_rage.png[/img] Heres my last proper Spectrum game, knock the pipes to the top of the screen to progre…

    Was going to have crates that had to be shifted but it proved tricky implementing it.

    I'll be releasing the source code once its tidied up, maybe you can have a look and see where its going wrong.
    daveysludge daveysludge August 2016 Brand new software
  • Akalabeth gamei found now that someone ported an ansi-basic game (coded in 1979?) to msx-basic - what about a zx-spectrum basic version of it? ;) https://plus.goo…

    ... the X-axis to 255 shifted the graphics over to the ... extremities works best, thus:
    [code]
    0 >>> ...
    Battle Bunny Battle Bunny September 2016 Sinclair Basic
  • 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…

    ... -States to get the two shifted values you need but if ... character needs to be right shifted by 2. Byte wide shifts ... fun to consider the best code for each of the 64 ...
    gp2000 gp2000 October 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…

    ... the way the bytes are shifted. Example .sna [url=http://rgho ... the following idea

    [code].loop
    ld a,(de ... h
    djnz .loop
    [/code]

    Other than that ...
    Hikaru Hikaru October 2016 Development
  • So where is the random number in the Speccy ?So I am messing around with ZX Spectrum Assembler and I want a random number. I looked up previous posts and one of the links said that random number…

    ... their titles:

    [code]SpecialFXRng
    push hl
    DEFB #97,#FF,#80[/code]
    [/quote]

    shifted xor (pretty good), and ... Coming up with some code that seems to generate random ...
    Alcoholics Anonymous Alcoholics Anonymous November 2016 Assembler
  • New Game: A Yankee in Iraq (2017). A shoot-em-up.Last year, I [url="https://www.worldofspectrum.org/forums/discussion/53207/new-game-2016-revival-a-yankee-in-iraq-1992"]resurrected my old shoot-em-u…

    ... -shifted sprites [size=1]or maybe even *ahem* Hell D. Crunched ('code ...
    Hikaru Hikaru February 2017 Brand new software
  • New Game: A Yankee in Iraq (2017). A shoot-em-up.Last year, I [url="https://www.worldofspectrum.org/forums/discussion/53207/new-game-2016-revival-a-yankee-in-iraq-1992"]resurrected my old shoot-em-u…

    ... -shifted sprites [size=1]or maybe even *ahem* Hell D. Crunched ('code ... . The copter sprite is pre-shifted. I’m considering pre-shifting ... to fool around with pre-shifted sprites and animation.)
    3 ...
    Ast_A_Moore Ast_A_Moore February 2017 Brand new software
  • A sped up pixel-shift routine for 1-byte–wide spritesHere’s an optimized (for speed) real-time sprite shifting routine for sprites that are one byte wide. It uses no memory variables for storage of inte…

    ... ;898435"][quote="Jerri;898411"]
    [code]
    or a ; test shift ...
    ;no shift detected
    [/code]

    [/quote]
    Don ... /> first for non shifted sprite
    second for shifted sprite

    Jerri Jerri March 2017 Development
  • Jet Set Willy 2's original author releases a modded version of the game!Apologies if this has already been posted, but Derrick P. Rowson, the original author of Jet Set Willy 2, has been modding JSW2, and the latest versi…

    ... br />
    Changed the code that handles the drawing of ... the main triangle logo. code is smaller and more flexible ... sprites

    added code that converts the horizontal sprites ... . Various flags added and data shifted.

    changed ...
    ewgf ewgf March 2017 Games
  • The HL Register Pair Naming. An Observation.This isn’t really a question or a tip. Just an observation about the naming convention of the registers in the Z80 CPU. It seems that every register …

    ... decided this would make source-code too "number heavy", and wouldn ... use sequential letters of the alphabet for the secondary registers - and ...
    GReW GReW March 2017 Development
  • The HL Register Pair Naming. An Observation.This isn’t really a question or a tip. Just an observation about the naming convention of the registers in the Z80 CPU. It seems that every register …

    ... decided this would make source-code too "number heavy", and wouldn ... use sequential letters of the alphabet for the secondary registers - and ... /> "How about just using the alphabet starting with A?"

    rich_chandler rich_chandler March 2017 Development
  • Introduce yourself[SIZE=3][FONT=Comic Sans MS]This is the thread to stop by & introduce yourself.[/FONT][/SIZE]

    ... proper Speccy game in Machine Code so here I am. The ... electronics repairing computer monitors. That shifted into IT. The company I ...
    Balrockus Balrockus April 2017 Chit chat
  • The trouble with good code isLots of times I've come here to ask for help and always got it pretty promptly. Which is wonderful and one of the reasons why I don't think there's a…

    ... to go along with this alphabet soup. Yet once you start ... get more performance with machine code.

    I'm having ...
    mik3d3nch mik3d3nch May 2017 Chit chat
  • z88dk multicolour enginesI've been trying to work out how the multicolour sprite engines have been implemented in z88dk. It's not obvious. Looking in the source, I found …

    ... tile would need to be shifted, etc. Nothing like that is ... people intimately familiar with the code. It's too easy to ...
    thricenightly thricenightly July 2017 Development
  • z88dk multicolour enginesI've been trying to work out how the multicolour sprite engines have been implemented in z88dk. It's not obvious. Looking in the source, I found …

    ... tile would need to be shifted, etc. Nothing like that is ... people intimately familiar with the code. It's too easy to ...
    Einar Saukas Einar Saukas July 2017 Development
  • The point of IX+1 IX+2 ?the numbers that you can add-on to IX and IY seem hardcoded, so I dont see the use of that feature? any examples of the use of IX and IY plus number…

    ... (IX+n) may be shifted by two bytes (easily resolved ... the wizards in your code, modify the two-byte ... would lead to faster code because the right method ... . You would end up with code everywhere like:


    Then your code does not require any if ...
    Alcoholics Anonymous Alcoholics Anonymous July 2017 Assembler
  • z88dk terminalsto set up a terminal a bunch of numbers are needed: m4_zx_01_output_fzx(_window_1, 0x2330, 0, 0, 1, 14, 1, 19, 0, _ff_ao_Prefect, 14, 0, 14, 8, 1…

    ... ##
    dnl## ##
    dnl############################################################
    [/code]

    There are 21 ... kern (some letters can be shifted left prior to printing) so ...
    Alcoholics Anonymous Alcoholics Anonymous July 2017 Development
  • What is the maximum fps the spectrum can achieve?I have been doing some reading and from what I understand the Spectrum outputs a PAL signal, but that means it will display @50fps or @25fps? If t…

    ... the display with some pre-shifted repeated patterns.

    Then ... each pass around the game code takes two frames of the ... screen every time from pre-shifted blocks. His technique is faster ...
    joefish joefish August 2017 Hardware
  • How to automatically find the character set in a gameThis is all completely new to me, so please be patient. I've done some reading up on how character sets are handled by the Spectrum. I understand tha…

    ... method of scanning through the code?[/quote]

    [quote="tstih ... first ten letters of your alphabet.
    joefish joefish August 2017 Development
  • Disassembly starting from a tape fileFollowing on from the Atic Atak redefining keys thread, I was wondering how you'd go about disassembling the code from scratch. The approach used in …

    ... USR address to prevent code and data being shifted or modified on ... an unmodified version of the code and data to base your ...
    dbolli dbolli September 2017 Development
  • New Platform Game: "Moritz 48K"Hello. There appeared a new platform game with my music. The game has been made by Sebastian Braunert and Uwe Geiken. Enjoy. "Moritz 48K…

    ... ... We talk more than we code;-) Not to forget, we admire ... in a luminous light that shifted quickly between purple and green ... once more.

    Watson shifted uncomfortably in his chair and ...
    chico_71 chico_71 September 2017 Brand new software
  • A Neat Redefine Keys RoutinePreviously, I’ve only shared this routine with a couple of people via PM, but I’ve now decided to make it public. I optimized it for size, so it uses…

    ... a,32 ;%00100000 (initial mask shifted left one bit)
    2 ... keyboard_thingy
    ...
    ...
    [/code]

    [code]
    controls_i nop
    ...
    ...
    [/code]

    This would mean ...
    Ast_A_Moore Ast_A_Moore October 2017 Development
  • Gandalf [z88dk][Nirvana Plus][128Kb]Gandalf 1.00 [url="https://drive.google.com/open?id=1T9HK0_isoMrfogSIJVhPGehjVIdFus4c"]Download Ver 1.00[/url] Long after the destruction of t…

    ... , I have a lot of code in the top 16K
    shifted Nirvana down 0x4000 bytes? I ...
    Alcoholics Anonymous Alcoholics Anonymous February 2018 Brand new software
  • Gandalf [z88dk][Nirvana Plus][128Kb]Gandalf 1.00 [url="https://drive.google.com/open?id=1T9HK0_isoMrfogSIJVhPGehjVIdFus4c"]Download Ver 1.00[/url] Long after the destruction of t…

    ... top 16k since you've shifted Nirvana down 0x4000 bytes? I ... top 16K are stuffed with code. But it's 23 lines ...
    colonel32 colonel32 February 2018 Brand new software
  • 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…

    ... 't deduce it from the code.[/quote]

    ... description at the bottom.
    [code]
    .module drawstring
    ... data for the pattern, pre-shifted
    ld h,#0x00 ... /> .db 0, 0
    [/code]

    Data:
    ...
    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…

    ... previous one aimed at small code footprint, since it was used ... the shifting by storing pre-shifted versions of the glyphs. That ... doesn't need to be shifted, and the first glyph always ...
    Sol_HSA Sol_HSA December 2018 Development
<1…15161718192021…34>

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