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  • zx81 rf outputHi All I'm not sure if this is an appropriate forum for the zx81, however I'll ask anyway;) I've connected my zx81 up to a mid 90's color tv. I can…

    ... modulator circuitry with a transistor buffer like this: [URL="http://www ... be.

    Above transistor buffer (+ capacitor if used) fits comfortably ... case.[/QUOTE]

    I double that....

    I used ...
    gtsamour gtsamour January 2011 Hardware
  • yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…

    ... to make one circular byte buffer for example and reuse the ... all drivers needing a circular buffer, not create 5 different implementations ... an IEEE single and maybe double precision implemnetation if someone has ...
    Alcoholics Anonymous Alcoholics Anonymous January 2011 Development
  • Sprites masterclassHi All, You guys are probably tired of explaining sprites but I'd like to clarify a few things if possible. I've sorted the vertical aspect of scro…

    ... />
    (1) use a back buffer for the sprites and erase ... />
    (2) use a back buffer for the entire screen and ... /> (3) (128K machines only) Hardware double buffering. That is, display the ...
    Marko Marko February 2011 Development
  • Sprites masterclassHi All, You guys are probably tired of explaining sprites but I'd like to clarify a few things if possible. I've sorted the vertical aspect of scro…

    ... to run at 25fps and double that number to approximately 10 ... write shifted sprites to a buffer area and then blit those ...
    Turkwel Turkwel February 2011 Development
  • Rendering techniques in emulatorsI've been giving thought to the possibility of speeding up the rendering in Zero considering I've been putting it off long enough. My approach is c…

    ... you're writing to a buffer - don't clear it at ... dumping the contents of that buffer to the display, only dump ... understood it having only written double-buffering routines on an ST ... old display as your second buffer.
    joefish joefish April 2011 Emulators
  • Minor Update to Gasman's Midi2BEEPDon't know whether this is worthy an announcement, but for those of you who enjoyed Gasman's midi2BEEP utility, a new variant has been made called mi…

    ... stupid in the end... I double checked the listing that was ... (ie: double spaced), prior copying across to Unreal's keyboard buffer... (note ...
    kgmcneil kgmcneil April 2011 Announcements
  • GUI/OS for the Spectrum?Hi, Is anybody working on a WIMP/GUI system for the Spec? Is there anything current out there? [url]http://snakeoillabs.com/wordpress/2005/10/30/8…

    ... messages are almost impossible without double buffering. the point being: no ... when copying screen from shadow buffer. if done inside drawing function ...
    tstih tstih June 2011 Development
  • IN or INKEY ?just curious which is better to use.. I have a menu done.. and use 6/7 to go up down it + space to cycle thru the options (using inkey).. obv. if I w…

    ... the value of the keyboard buffer (or along them lines) ?
    double high fonts on 64 for ...
    fog fog October 2011 Sinclair Basic
  • IN or INKEY ?just curious which is better to use.. I have a menu done.. and use 6/7 to go up down it + space to cycle thru the options (using inkey).. obv. if I w…

    ... the value of the keyboard buffer (or along them lines) ?
    double high fonts on 64 for ...
    Paddy Coleman Paddy Coleman October 2011 Sinclair Basic
  • Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …

    ... that line in the buffer (not the start of ...
    Of course, your buffer can then be wider than ... you're using an intermediate buffer to add sprites.
    ... passes to change the buffer address to start reading ... row address table - either double it in length so ...
    joefish joefish May 2012 Development
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... contention etc you have to buffer a line of output to ... the previous one twice at double speed.

    scan doublers ...
    guesser guesser May 2012 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... contention etc you have to buffer a line of output to ... the previous one twice at double speed.

    scan doublers ...
    Johan1973 Johan1973 May 2012 Hardware
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... . So it's incapable of double-buffering the enhanced colour screens ... /> The only screens it can buffer and display independently are two ...
    joefish joefish August 2012 Sinclair Miscellaneous
  • Getting an 14Mhz crystal to oscillate?I am building a circuit with an 74LS32 and a 74LS193 to work as frequency divider. Though I have hit a snag, how to I wire up a crystal to make it os…

    ... necessary, add another inverter to buffer the output signal. Depending on ... logic like 74AC family to buffer or divide the signal down ... and example circuits out there, double it for half the frequency ...
    RetroTechie RetroTechie August 2012 Hardware
  • Coding for 128kHi all, I wonder if anyone can suggest any useful reading/threads/examples on the fundamentals of 128k coding. Chapter 24 of the +2 manual has prov…

    ... x2 if we're talking double buffering since... let's ... on case. all software double buffering methods has one significant ... . and honestly, implementing dirty buffer in good way is not ... examine possibility to use hardware double buffering and THEN perhaps choose ...
    catmeows catmeows October 2012 Development
  • Coding for 128kHi all, I wonder if anyone can suggest any useful reading/threads/examples on the fundamentals of 128k coding. Chapter 24 of the +2 manual has prov…

    ... on case. all software double buffering methods has one significant ... . and honestly, implementing dirty buffer in good way is not ... examine possibility to use hardware double buffering and THEN perhaps ... as choosing the appropriate draw buffer based on the high ...
    Hikaru Hikaru October 2012 Development
  • RAM used / corrupted by +3DOSAs I said previously, [url=http://www.worldofspectrum.org/forums/showthread.php?t=41775]I'm trying to put some games in hard disk[/url] so they can b…

    ... br />
    H - First Buffer for RAMdisk: 8 (RAM1, starting at $1000 ... - Size of RAMdisk: 120 sectors (60k).
    D - First buffer for cache ... no disk cache, but and RAMdisk takes all memory (starting at ... call for setting to 32k RAMdisk (starting at RAM3) and ...
    Zup Zup December 2012 Games
  • +3 BASIC DOS_DemoI got side-tracked while working on the Op.Wolf conversion and ended up writing this +3 DOS utility which provides most of the disk functions that mi…

    ...
    REM 4: DOS/RAM buffer extents
    REM 5: DOS ... . Pages 5 and 2 have double entries because of their alternative ...
    Battle Bunny Battle Bunny December 2012 Sinclair Basic
  • Video generation using a CPUWe know it is possible to generate a video signal using a CPU, and this technique was often used on low-end computers in the early 1980's (for exampl…

    ... clock is 6.5 MHz, double the CPU clock and synchronized ... . But even a simple frame buffer like in the ZX Spectrum ...
    RetroTechie RetroTechie January 2013 Chit chat
  • Disabling the +3 disk buffer; yes, but how?I would like to disable the +3 disk buffer in order to retrieve those 4K from the machine's RAMdisk. By reading the computer manual and some posts on…

    ... buffer in order to retrieve those 4K from the machine's RAMdisk ...
    SKR SKR February 2013 Sinclair Basic
  • Disabling the +3 disk buffer; yes, but how?I would like to disable the +3 disk buffer in order to retrieve those 4K from the machine's RAMdisk. By reading the computer manual and some posts on…

    ... buffer in order to retrieve those 4K from the machine's RAMdisk ... ]
    LD D,0 ; first buffer for disk cache
    LD ...
    LD H,0 ; first buffer for RAM Disc
    LD ...
    The_Bert The_Bert February 2013 Sinclair Basic
  • The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…

    ... in the DISCiPLE, whereby a double reset could still leave RAM ... ...), and shouldn't re-use buffer contents from before a reset ... various buffers, especially the sector buffer, sector address map and bit ...
    zub zub February 2013 Hardware
  • Disabling the +3 disk buffer; yes, but how?I would like to disable the +3 disk buffer in order to retrieve those 4K from the machine's RAMdisk. By reading the computer manual and some posts on…

    ... will disable the +3 disk buffer. This hardly makes any difference ... once, and a cache or buffer doesnt make hardly any difference ... extra 4K is dedicated to RAMDISK so routine would also be ...
    nuggetreggae nuggetreggae February 2013 Sinclair Basic
  • Keyboard scanning routines / techniques?What keyboard scanning routines or techniques do people use? I'm looking to write something which doesn't rely on the ROM-based keyboard scanner, an…

    ... placed to circular keyboard buffer. Undefined combinations can be ... tables making keyboard extendable. Buffer overflow means losing older ... DOS state manipulations and ramdisk access) leaving the di ... up events to keyboard buffer enabling simple console processing ...
    u6c87 u6c87 May 2013 Development
  • pathfindingworking on pathfinding in the game. here is Russian description of Lee's algorithm: [url]http://algolist.manual.ru/games/wavealg.php[/url] "if-then"…

    ... points to first element on double linked list of nodes. All ... much work in a circular buffer with very few elements, such ...
    Patrik Rak Patrik Rak May 2013 Development
  • pathfindingworking on pathfinding in the game. here is Russian description of Lee's algorithm: [url]http://algolist.manual.ru/games/wavealg.php[/url] "if-then"…

    ... points to first element on double linked list of nodes. All ... only requires a single circular buffer. The best implementation would use ...
    Einar Saukas Einar Saukas May 2013 Development
  • Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…

    ... conservative. In my experience with double screen buffer blitting, efficient blitters based ...
    introspec introspec June 2013 Development
  • Microdrive Serial ProtocolGentlemen, I've been dreaming for a long time to develop a Microdrive emulator, where an SD card loaded with .MDR cartridge images can be accessed t…

    ... will have some element of double buffering - it'll have a ... to have a one byte buffer at most at a guess ...
    Winston Winston June 2013 Hardware
  • Fast Z80Todays Spectrums are fast as hell and few software utilises this. Z80 in ReVerSE runs at 42 MHz, in Speccy2010 at 28 MHz, in Pentagon 2.666 and in N…

    ... could 'memmap' views of a ramdisk file into the 64k. Streaming ... 's space except as destination buffer.

    3) introduction of ...
    Alcoholics Anonymous Alcoholics Anonymous July 2013 Development
  • The Official Crap Games Competition 2013 Thread!Just to announce that the 2013 CGC is OPEN! [IMG]http://i1142.photobucket.com/albums/n608/daveyboyhughes/cgctitle2_zps77591934.jpg[/IMG] And for th…

    ... implement a circular buffer though (since it is a double ended queue ... that without traversing the entire buffer though.

    But since ... complexity) rather than the circular buffer O(1) case]. In a ...
    Paradigm Shifter Paradigm Shifter July 2013 Games
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HitBox

Word Docs Hits
ramdisk 256 368
double 8K 9.4K
buffer 2.6K 4.9K

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