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  • Sinclairean A3[B]Sinclairean[/B], a new ZX Spectrum emulator written in machine code for x86-compatible, OpenGL-capable computers. Features: [LIST] [*]Fast machin…

    ... on the following release. Real contended memory, floating bus and machine ...
    Madonna Mk 2 Madonna Mk 2 March 2010 Emulators
  • Is there any video input on expansion bus?Imagine you want to build a custom display hardware, for instance, to add hardware sprites to display. Is it possible to design such a device so that…

    ... is doing something with non contended memory, and no VRAM data ...
    mcleod_ideafix mcleod_ideafix March 2010 Hardware
  • Is there any video input on expansion bus?Imagine you want to build a custom display hardware, for instance, to add hardware sprites to display. Is it possible to design such a device so that…

    ... is doing something with non contended memory, and no VRAM data ...
    Alcoholics Anonymous Alcoholics Anonymous March 2010 Hardware
  • Spectrum 2-3 times more powerfull than MSX?![url]http://www.youtube.com/watch?v=2-kI0urN9tI#t=8m18s[/url]

    ... [/i] of waitcycles to any contended memory (aka screen) accesses :-)
    Philip Kendall Philip Kendall March 2010 Sinclair Miscellaneous
  • Spectrum 2-3 times more powerfull than MSX?![url]http://www.youtube.com/watch?v=2-kI0urN9tI#t=8m18s[/url]

    ... will be corruption. Outside the contended zone, there's no need ...
    Metalbrain Metalbrain March 2010 Sinclair Miscellaneous
  • CPI emulationI'm currently writing Sinclairean's emulation assembly for the CPI/CPD/CPIR/CPDR instruction group. Does anybody know what exactly the behavior of th…

    All 5 are contended (48K/128K ULAs, not for the +2a/+3) with contention based on the address in HL. And there is no write as you say :)

    The same goes for the extra 5 for the repeating varieties.
    Woody Woody March 2010 Emulators
  • CPI emulationI'm currently writing Sinclairean's emulation assembly for the CPI/CPD/CPIR/CPDR instruction group. Does anybody know what exactly the behavior of th…

    ... is why all those IR contended cycles have an effect also ... wiki - the final ir:1 contended cycle for LD I,A ...
    Woody Woody March 2010 Emulators
  • Problem with Spin 0.7s +3 file I/OI'm currently trying the +3 disk functions in z88dk. I've based my work upon the simple snippet Winston posted a while ago, but doing the contrary. H…

    ... the stack to be in contended ram so a better location ...
    Alcoholics Anonymous Alcoholics Anonymous March 2010 Emulators
  • Feelin' kinda proud of myselfOkay, it has bugs. But I kludged it together about 10 mins after getting the sprite thing to actually work. [url]http://britlion.googlepages.com/Spr…

    ... (hl)


    Use LDI to copy memory, so

    becomes
    LDI

    (The caveat here ... is that LDI does dec BC as well ...
    Gedlion Gedlion March 2010 Development
  • Feelin' kinda proud of myselfOkay, it has bugs. But I kludged it together about 10 mins after getting the sprite thing to actually work. [url]http://britlion.googlepages.com/Spr…

    ... (hl)


    Use LDI to copy memory, so

    becomes
    LDI

    (The caveat here ... is that LDI does dec BC as well ...
    na_th_an na_th_an March 2010 Development
  • tricks to simplify codingWhen i started with programming in assembler i had very simple approach to do things. Just shifting bytes around, doing simple tests and so... Later …

    ... br /> ldi ; GNO
    ldi ; FLG1 LO
    ldi ; FLG1 HO
    ldi ; ...
    ldi ; TYP
    ldi ; XNO LO
    ldi ; XNO HL
    ldi ; YNO ... br /> ldi ; GNO
    ldi ; FLG1 LO
    ldi ; FLG1 HO
    ldi ; ...
    frobush frobush March 2010 Development
  • Mistake in the 128K technical FAQ?[url]http://www.worldofspectrum.org/faq/reference/128kreference.htm[/url] [quote]Memory banks 1,3,5 and 7 are contended.[/quote] Really? I thought i…

    ... the slight speed loss of contended RAM. It loads a number ...
    ajmoss ajmoss April 2010 Hardware
  • Mistake in the 128K technical FAQ?[url]http://www.worldofspectrum.org/faq/reference/128kreference.htm[/url] [quote]Memory banks 1,3,5 and 7 are contended.[/quote] Really? I thought i…

    ... the slight speed loss of contended RAM. It loads a number ... ROM routine runs, then (possibly contended) RAM should only be accessed ... when loading or saving to contended RAM. And on 16K/48K ... to the lower 16K RAM (contended). On 16K models, that's ...
    RetroTechie RetroTechie April 2010 Hardware
  • Mistake in the 128K technical FAQ?[url]http://www.worldofspectrum.org/faq/reference/128kreference.htm[/url] [quote]Memory banks 1,3,5 and 7 are contended.[/quote] Really? I thought i…

    ... allow for the possibility of contended RAM.
    ajmoss ajmoss April 2010 Hardware
  • IM2 Loading on +3EHi there Speccy Guru's, As some of you know, I've spent a while building the ultimate image for +3e, it's currently at 6000+games and demos and i've…

    ... longer/shorter due to different contended ram banks on newer/older ...
    nuggetreggae nuggetreggae April 2010 Development
  • Flicker fixer for ZX 48KHas anyone the schematics for the flicker fixer: [URL]http://8bit.yarek.pl/computer/zx.48/[/URL] Micky

    ... be able to detect a contended memory access, and will cause ...
    mcleod_ideafix mcleod_ideafix April 2010 Hardware
  • Flicker fixer for ZX 48KHas anyone the schematics for the flicker fixer: [URL]http://8bit.yarek.pl/computer/zx.48/[/URL] Micky

    ... in IORQ cycle speed-up contended ports adress (OUT/IN instructions ...
    velesoft velesoft April 2010 Hardware
  • IM2 Loading on +3EHi there Speccy Guru's, As some of you know, I've spent a while building the ultimate image for +3e, it's currently at 6000+games and demos and i've…

    ... done on a machine with contended screen memory (it requires too ...
    gasman gasman April 2010 Development
  • IM2 Loading on +3EHi there Speccy Guru's, As some of you know, I've spent a while building the ultimate image for +3e, it's currently at 6000+games and demos and i've…

    ... done on a machine with contended screen memory (it requires too ...
    Tom-Cat Tom-Cat April 2010 Development
  • Resolution & Memory Question ...Hi, I'm hoping someone with some experience writing an emulator, or a vast knowledge of all things Spectrum can help me answer the following questio…

    ... Data
    0xOFFSET2+1 - 0xOFFSET3 : Contended Memory
    0xOFFSET3+1 - 0xFINAL ...
    micpringle micpringle April 2010 Emulators
  • Resolution & Memory Question ...Hi, I'm hoping someone with some experience writing an emulator, or a vast knowledge of all things Spectrum can help me answer the following questio…

    ... + attribute) which is also the contended memory.
    32768 to 65535 ...
    Arjun Arjun April 2010 Emulators
  • Resolution & Memory Question ...Hi, I'm hoping someone with some experience writing an emulator, or a vast knowledge of all things Spectrum can help me answer the following questio…

    ... . Quite right. I inadvertently clubbed contended memory with the display memory ...
    Arjun Arjun April 2010 Emulators
  • Resolution & Memory Question ...Hi, I'm hoping someone with some experience writing an emulator, or a vast knowledge of all things Spectrum can help me answer the following questio…

    ... -0x3FFF ROM
    0x4000-0x7FFF (Contended) User RAM
    0x8000-0xFFFF ... RAM

    Within the contended user RAM:

    0x4000 ... certain times. This is the 'contended memory'.

    The remaining ...
    joefish joefish April 2010 Emulators
  • 48k Timing Tests...Here's v1 of the timing tests for the 48k Spectrum, with a little background [IMG]http://www.zxspectrum4.net/images/timing_test_v1.jpg[/IMG] [URL="…

    ... failed two tests (12 contended and 27 contended). It had warmed only ...
    Metalbrain Metalbrain April 2010 Development
  • Retro Gaming Love or Profiteering - A DiscussionI'm having a debate on a forum for a popular MAME (arcade emulator) front end (Hyperspin). I'm questioning the ethics of a site called EmuMovies.co…

    ... 16MBps home connection (which is contended and has only 800Kbits or ...
    Winston Winston April 2010 Chit chat
  • Mistake in the 128K technical FAQ?[url]http://www.worldofspectrum.org/faq/reference/128kreference.htm[/url] [quote]Memory banks 1,3,5 and 7 are contended.[/quote] Really? I thought i…

    ... .
    Pages 4-7 are contended in that the Z80 and ...
    ajmoss ajmoss April 2010 Hardware
  • Mistake in the 128K technical FAQ?[url]http://www.worldofspectrum.org/faq/reference/128kreference.htm[/url] [quote]Memory banks 1,3,5 and 7 are contended.[/quote] Really? I thought i…

    ... say the same banks are contended so how can that be ...
    Woody Woody April 2010 Hardware
  • Mistake in the 128K technical FAQ?[url]http://www.worldofspectrum.org/faq/reference/128kreference.htm[/url] [quote]Memory banks 1,3,5 and 7 are contended.[/quote] Really? I thought i…

    ... .

    If (HL) is contended, two passes of the loop ... to 50 T for non-contended RAM.

    A fairly ...
    ajmoss ajmoss April 2010 Hardware
  • Mistake in the 128K technical FAQ?[url]http://www.worldofspectrum.org/faq/reference/128kreference.htm[/url] [quote]Memory banks 1,3,5 and 7 are contended.[/quote] Really? I thought i…

    Hardware is the answer... or not ?

    From: [url]www.fruitcake.plus.com[/url]
    The RAM banks 4, 5, 6 and 7 (the contended RAM) are formed from IC6 - IC13, whereas the RAM banks 0, 1, 2 and 3 (the uncontended RAM) are formed from IC15 - IC22.
    kpuchatek kpuchatek April 2010 Hardware
  • CPU speed measure possible?Is it possible to measure the CPU speed and shows the result on a LED display? Micky

    ... 't run the code in contended memory, and coding a loop ...
    RetroTechie RetroTechie May 2010 Hardware
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Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

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