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<1…14151617181920…34>
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... .

    [quote="Hikaru;921353"]Memory contention has literally nothing to ... that are not dependent on contended memory:

    Port: #40ff
    contended memory works:

    Port: #0ffd ...
    Ast_A_Moore Ast_A_Moore September 2017 Development
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... ="Ast_A_Moore;921357"][quote="Hikaru;921353"]Memory contention has literally nothing to ... that are not dependent on contended memory[/quote]

    Oh, that ...
    Hikaru Hikaru September 2017 Development
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... ) ;[13c] (use an addr in contended memory)
    ld a,e ;[4 ...
    Ast_A_Moore Ast_A_Moore September 2017 Development
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... might still be just the contended pages that influence this. Notice ... 's screenshots above where the memory test is active concern the ... which sets memory from 0 to 49151 to use contended pages (4 ... but is in fact the contended memory page 4. Moreover, the value ...
    Hikaru Hikaru September 2017 Development
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... :
    - Concerns just the contended parts of memory (it didn't trigger ... that any reading from the contended memory, including instruction code fetching, influences ...
    weiv weiv September 2017 Development
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... set).
    4. During non-contended intervals (that is, when the ... that was last read from contended memory (usually, the last attribute byte ...
    Ast_A_Moore Ast_A_Moore September 2017 Development
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... Ast_A_Moore;921973"]4. During non-contended intervals (that is, when the ... that was last read from contended memory (usually, the last attribute ... and writing from/to slow memory pages by Z80 (including ... the last operation with slow memory (pages 4,5,67) ...
    weiv weiv September 2017 Development
  • Loadsa bullets on screen (silkworm)Did games like silkworm just draw everything to the screen or did they have complicated optimisations? and the types of games where sprites can occu…

    ... or the destination is uncontended memory).
    A PUSH and a ... back-to-back PUSHes into contended memory. And on top of that ...
    joefish joefish October 2017 Development
  • ZX Spectrum +3 repairI have my first +3 here, and it needs repairs. Hoping someone here can help me out. When I power it on I get this screen with black and white line…

    ... .

    Ricky's memory looks to be working just ... I have already run the memory test program from GitHub ([url ... time.

    A second memory test program came courtesy of ... it was accessing the non-contended memory banks and retrieving the wrong ...
    The Mighty Dopethrone The Mighty Dopethrone November 2017 Hardware
  • Clever, yes. Useful? Not so sure. Re: LOAD ""CODE gamesI was always curious about how the (few) games that require that you type LOAD ""CODE, rather than the usual LOAD "" worked, but only just now decide…

    ... code closer to the non-contended memory. A little inefficient, but no ...
    Ast_A_Moore Ast_A_Moore November 2017 Development
  • Detecting +3 / +2AWhat's a simple but reliable way to detect if code is running on a +2A/+3? My first though was to try switching to ROM2 and then checking for the …

    ... cliff.

    The contented memory on a 48K and 128K ... , for example, a PUSH into contended memory can be slowed down to ... a function that writes to contended memory with alternate gaps of 7 ... copying from fast RAM into contended RAM, back-to-back LDIs ...
    joefish joefish December 2017 Development
  • Detecting +3 / +2AWhat's a simple but reliable way to detect if code is running on a +2A/+3? My first though was to try switching to ROM2 and then checking for the …

    First it does some contended memory writing, counting as it goes. ...
    joefish joefish December 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…

    ... the "I" register points into contended memory, snow will appear on the ... the "I" register points into contended memory and code is executing in ... a contended bank, the machine can ... Amstrad changed which banks were contended on the +3. On ...
    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…

    ... the "I" register points into contended memory, snow will appear on the ... the "I" register points into contended memory and code is executing in ... a contended bank, the machine can crash ...
    AndyC AndyC 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…

    ... the "I" register points into contended memory, snow will appear on the ... the "I" register points into contended memory and code is executing in ... a contended bank, the machine can crash ...
    Ast_A_Moore Ast_A_Moore 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…

    ... the "I" register points into contended memory, snow will appear on the ... the "I" register points into contended memory and code is executing in ... a contended bank, the machine can crash ...
    cgonzalez cgonzalez 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…

    ... the "I" register points into contended memory, snow will appear on the ... the "I" register points into contended memory and code is executing in ... a contended bank, the machine can crash ...
    Ast_A_Moore Ast_A_Moore February 2018 Brand new software
  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... should also be avoided if contended memory
    (i.e. RAM 4 ... very
    confident of your memory mapping (or you are only ...
    AndyC AndyC February 2018 Development
  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... :

    [quote]
    if contended memory (i.e. RAM 4 to ... /> Well, we know that the contended memory on these machines is [i ... very
    confident of your memory mapping (or you are only ...
    Ast_A_Moore Ast_A_Moore February 2018 Development
  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... variables are very low in memory, not at $F72C.

    contended memory (the beeper effects are not ... think they ran out of memory and opted for overwriting system ... to leave a lump of memory unused if basic and the ...
    Alcoholics Anonymous Alcoholics Anonymous February 2018 Development
  • I introduce myself and my emulator.Hi! My name is Marta, and I've been a Speccy user for 30+ years now. During the past year I decided to write my own emulator, just to see if I cou…

    ... the floating bus values from contended memory reads.

    But hey ...
    TheMartian TheMartian March 2018 Emulators
  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... interrupt vector table in non-contended memory, then switched them one after ... itself) from various memory locations, i.e. contended/non-contended. The snow-effect ... but to any location in contended memory.

    Nothing we didn ...
    Ast_A_Moore Ast_A_Moore March 2018 Development
  • Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…

    ... it never outputs on a contended cycle, or use different code ... beeper engines sit in non-contended memory anyway, so other than the ...
    Ast_A_Moore Ast_A_Moore July 2018 Assembler
  • A Yankee in IraqI'm testing the game on the zx next and it currently hangs right after the game starts no matter what timing regimen and contention pattern is chosen…

    ... a,($5800) ;[13]point to contended memory and fetch a "blanking" attr ...
    Ast_A_Moore Ast_A_Moore February 2019 Development
  • border effectsive been playing around with border effects like 10 border 1 20 border 2 30 pause 1 40 goto 10 ,etc i even wrote one in machine code. …

    ... ]

    And note that contended memory is used.
    Which is ...
    azesmbog azesmbog May 2019 BASIC
  • New emulator: InkSpector 2Hi, The first preview of InkSpector 2 is available from www.inkland.org.uk/inkspector/inkspec_2.0.0.27.exe It's a brand new emulator with all …

    ... a bit harder due to contended memory). I have several dozens of ...
    azesmbog azesmbog November 2019 Emulators
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... +2A and +3 ASIC, when memory paging is enabled, will return ... read from, or written to, contended memory by the Z80, but with ...
    Ast_A_Moore Ast_A_Moore November 2019 Development
  • Richard Altwasser magazine interview.This may be of interest to some. A short interview concerning some tecchy aspects of the ZX spectrum. https://paleotronic.com/2018/10/01/an-interv…

    ... , and it didn't have contended memory, and it was faster than ...
    Winston Winston March 2020 Sinclair Miscellaneous
  • 50+ FPS GAMESHi guys) Which was the first Speccy game with 50/60 frames per second? And what was the main reason? Thank you

    ... achieve a smooth, flickerless experience. Contended memory should only be used for ...
    Ast_A_Moore Ast_A_Moore March 2020 Games
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