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<1234567…34>
  • On 48k, can I copy 4k before next screen updateFollowing on from my thread at [url="http://www.worldofspectrum.org/forums/viewtopic.php?topic=6423&forum=11"]http://www.worldofspectrum.org/forums/v…

    ... fragment is almost as fast as possible (the use ... per byte copy, albeit 14 bytes per block rather than ... convenient 16 bytes per block that Gasman's version ... you're using this fast stack-copy code with the " ... the start of your copy routine after the interrupt. ...
    Alcoholics Anonymous Alcoholics Anonymous September 2004 Development
  • SE BasicAfter 13 years of development I thought I'd run out of things to optimize, but it turns out I was wrong. However, I'm now running out of time to work…

    ... is not required.
    [*]Fast lo-res text printing.
    [*]Fast pilot signal sync.
    [*]Fast reset.
    [*] ... br /> [*]Full support for block graphics in hi-res mode ... and divMMC.
    [*]Z80 LDIR block copy: PUT 49152, 16384, 6912.[/ ...
    chev chev October 2013 Sinclair Basic
  • Running out of fingers in AssemblyDear all, Still trying to learn Assembly and have put a few routines together. However, as my routines become a little more involved I find myself…

    ... note of special architectural features (block copy, block io, separation of io and ... calling or falling into the block. The register pressure is ... the division first making it fast without register restriction. That' ... and it's the innermost block so it will be ...
    Alcoholics Anonymous Alcoholics Anonymous September 2016 Development
  • Wrong-endian data table?I'm drawing up the memory map for something I'm writing. I'll be using machine code on a byte array of 256 elements, each element consisting of 64 by…

    ... won't be a simple block copy operation, so [b]LDIR[/b ...
    ajmoss ajmoss December 2009 Development
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... , bigger than the FPGA)
    Fast SRAM: 2 EUR
    [B ... to generate clocks, and enough fast block RAM to implement an extra ... /> Despite that, the process is fast and the result is not ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • ZX Alien Breed - WIPI'm sure a lot of you have seen the discussion in the New Game Ideas area about a Speccy version of the classic Amiga game Alien Breed. I've been dro…

    ... nifty use of the LDIR block-copy routine means I can shift ...
    LuMan LuMan April 2014 Announcements
  • Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…

    ... can now make huge, multi-block sprites and shift them up ... ;BC is counter for block copy
    LDIR ;Copy slice
    ld a ...
    LuMan LuMan April 2014 Development
  • Need help with my P flag!Not sure if I've emulated the P flag correctly when its comes to overflows. Here's what I've done: LD A,123 LD B,16 ADD A,B Twos Complement of 123 …

    ... P/V flag oddities. eg, block copy stuff and ld a,i ...
    Alcoholics Anonymous Alcoholics Anonymous February 2005 Development
  • divIDE issuesI discovered a few issues with the divIDE hardware and FATware software that may be of interest to some people. 1. ROM paging If your Spectrum is a…

    ... device using dd or similar block-copy utility. Goot fs formatters will ...
    zilog zilog October 2005 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…

    ... little hw support) is a fast byte copy (for copying a back ... the main display) and a fast write/clear (for zeroing the ... possible to do the byte copy at a speed of 13 ... (not the same as a copy, more limited) at about 5 ...
    Alcoholics Anonymous Alcoholics Anonymous September 2006 Sinclair Miscellaneous
  • A few questions about machine codeOh no... another noob. I'm giving my first steps in assembler (finally, after 20 years stuck in BASIC). I read a SU article explaining that if I wan…

    ... to DE. It's a block copy command. It loads the address ...
    DEATH DEATH August 2007 Sinclair Miscellaneous
  • Five updated ZX-Modules programsDear forum readers, I have updated my ZX-Modules programs to the following version states: ZX-Editor 1.1.0.4 ZX-Preview 1.0.1.2 ZX-Paintbrush 1.2.0…

    ... to save 4 parts then copy /b them together. I guess ... this with a MDR sector block copy anyway ;-). It was faster than ...
    Andrew Barker Andrew Barker December 2007 Announcements
  • Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…

    [QUOTE=aowen;243140]block copy will do. If I can ...
    Alcoholics Anonymous Alcoholics Anonymous February 2008 Development
  • 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 …

    ... just use a routine to block copy it to RAM. That's ...
    BloodBaz BloodBaz April 2008 Emulators
  • A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…

    ... ZX screen
    ; Copy them in reverse order
    block
    ;copy line to location "32 ... ZX screen
    ; Copy them in forward order
    block
    ;copy line from location "(7 ...
    Digital Prawn Digital Prawn December 2008 Development
  • An apologyI wish to apologise to those of you who viewed my 'post' yesterday I posted a picture in the 'no more heroes' thread of my hero Evel Knievel unfortu…

    ... YOU want to, then just BLOCK COPY this - "Jof is not arsed ...
    frobush frobush July 2009 Chit chat
  • Tatung Einstein for developmentI know some developers used a [URL="http://old-school-micro.blogspot.com/2009/11/retro-computers-tatung-einstein-retro.html"]Tatung Einstein[/URL] to…

    ... 'd jump to label.. errm block copy /edits.
    fog fog November 2009 Games
  • Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…

    ...

    REPT 8
    ; copy data
    ld a, (hl ... *24 ; byte count
    ldir ; block copy

    ; set the attributes ...
    Paradigm Shifter Paradigm Shifter February 2010 Games
  • Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…

    ... *24 ; byte count
    ldir ; block copy

    ; set the attributes ...
    frobush frobush February 2010 Games
  • QL microdrive cartridge questionOkay, I'm throwing this open to the Speccy community at large... Does anyone know what I would need to do to examine the contents of a QL microdrive…

    ... similar) - this makes a fast sector copy to ram disk and highlights ...
    rwap rwap June 2010 Emulators
  • Hi Res Print Routine neededHas anyone seen code for a print routine with pixel accuracy? That is print(y,x,CHAR) that allows 0 < y < 192 and 0 < x < 255 - that takes a charact…

    ... />
    There is a very fast block memory allocator that allocates blocks ...
    Alcoholics Anonymous Alcoholics Anonymous June 2010 Development
  • Help! Reverse engineering a Spectrum game[deleted]

    ... /> 06 - A set of fast memory copy and memory store routines
    07 - A fast clear screen routine ... any size
    12 - A fast sprite routine, that is; optimised ... SIN/COS
    20 - A fast screen address lookup routine, that ...
    ASM ASM October 2010 Development
  • Help! Reverse engineering a Spectrum game[deleted]

    ... /> 06 - A set of fast memory copy and memory store routines

    07 - A fast clear screen routine using the ... [/B]

    12 - A fast sprite routine, that is; optimised ... [/B]

    20 - A fast screen address lookup routine, that ...
    Ralf Ralf October 2010 Development
  • New tool: ZXBOOT.EXE[B]ASM[/B] is proud to present the first release of ZXBOOT.EXE: [url]http://www.4shared.com/file/NP-FVOSf/zxboot__beta_.html[/url] ZXBOOT is a comma…

    ... my teenage years I considered block copy instructions to be 'too slow ...
    ASM ASM November 2010 Announcements
  • Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…

    ... 't use any of the block copy operations or even PUSH to ...
    AndyC AndyC February 2011 Sinclair Basic
  • Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…

    ... 't use any of the block copy operations or even PUSH to ...
    TVzombie TVzombie February 2011 Sinclair Basic
  • Something a bit like Jetpack Joyride in flavour?Jetpack Joyride is a fairly simple horizontal scrolling game, in which the player has one control. That control applies power to the jetpack as long …

    ... monochrome.

    As for fast block-built scrollers, you're not ... necessarily limited to just one block type. 50Hurts uses two on ... 't have to have every block or row of the screen ... 't need to make the block-built scenery all that hazardous ...
    joefish joefish April 2012 New game ideas
  • OpenSE BASIC 3.1.1The eagle-eyed will have noticed that [url="http://www.worldofspectrum.org/infoseekid.cgi?id=0027510"]SE BASIC[/url] got an update last week. As a te…

    ... use the MOVE command to block copy data from paged RAM to ...
    chev chev May 2012 Sinclair Basic
  • OpenSE BASIC 3.1.1The eagle-eyed will have noticed that [url="http://www.worldofspectrum.org/infoseekid.cgi?id=0027510"]SE BASIC[/url] got an update last week. As a te…

    ... use the MOVE command to block copy data from paged RAM to ...
    Paddy Coleman Paddy Coleman May 2012 Sinclair Basic
  • Fantasy Z80 instructions?This follows on from something catmeows said in another thread, and that I've been meaning to ask for a while. This may sound daft to people with mo…

    ... JR cc,nn

    Block Copy/Etc
    --------------
    {LD,CP ...
    Jonathan Harston Jonathan Harston November 2012 Development
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Latest Posts

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