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  • 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…

    ... code will always sit in contended memory. I?m not sure ...
    RST#08 RST#08 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…

    ... scheme - afaik all memory was contended, anytime (so every memory access ...
    TVzombie TVzombie February 2011 Sinclair Basic
  • Official CSSCGC 2011 Competition ThreadHello fellas. The site is up and running. We are already accepting submissions. [url]http://www.mojontwins.com/csscgc2011/[/url] Rules, info, and e…

    ... : We get advantage of the contended memory problem by sending two ...
    apenao apenao February 2011 Games
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ... bus? failed (0xff)
    Contended memory? passed
    High port ... LDIR? failed (0x01)
    Contended IN? failed (0xfe)
    ... LDIR? failed (0x05)
    Contended IN? failed (0x03)
    ... bus? failed (0x00)
    Contended memory? failed (0x02)
    ...
    gasman gasman February 2011 Hardware
  • contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …

    ... have odd banks contended and even banks non contended, and +2A/B ... banks 0-3 non contended and 4-7 contended. Is this right ...
    BiNMaN BiNMaN February 2011 Hardware
  • Push/Pop data copyingWe all know that stack pointer cheese and push/pop is faster to move data than LDIR - which in turn is slower than unrolled LDI's anyway. I rewrote …

    ... want to synchronise with the contended memory cycles, so as not ...
    joefish joefish March 2011 Development
  • Push/Pop data copyingWe all know that stack pointer cheese and push/pop is faster to move data than LDIR - which in turn is slower than unrolled LDI's anyway. I rewrote …

    ... want to synchronise with the contended memory cycles, so as not ... method and lots of tedious contended cycle counting...

    [code ... ]
    ; start on the first contended cycle of the line
    gasman gasman March 2011 Development
  • Push/Pop data copyingWe all know that stack pointer cheese and push/pop is faster to move data than LDIR - which in turn is slower than unrolled LDI's anyway. I rewrote …

    ... didn't do any tricksy contended-cycle-counting then either, so ...
    gasman gasman March 2011 Development
  • SAVEing without waiting for keypresshello, here's question for y'all. is there a way in BASIC to bypass the "Start tape, then press any key" prompt when SAVEing an array? sorry if it'…

    ... solution to working around the contended memory issue.

    anyway ...
    utz utz March 2011 Sinclair Basic
  • 50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…

    ... the code itself isn't contended, the instruction boils down to ... to 24T to do a contended PUSH.

    Now there ...
    joefish joefish April 2011 Development
  • The most unique game loaderFor me it has to be Technician Ted, when the stripes give way to walking men and a timer.

    ... nice. And it runs in contended memory. Thats rare as loaders ... rom would be running in contended RAM and a couple of ...
    nuggetreggae nuggetreggae April 2011 Games
  • 50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…

    ... slow down. Thanks to the contended way the screen memory works ...
    joefish joefish April 2011 Development
  • contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …

    ... ]- I/O operations are not contended (fast IN/OUT instructions)[/B ...
    velesoft velesoft April 2011 Hardware
  • contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …

    ... ]- I/O operations are not contended (fast IN/OUT instructions)[/B ...
    chev chev April 2011 Hardware
  • contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …

    ... ]- I/O operations are not contended (fast IN/OUT instructions)[/B ...
    BiNMaN BiNMaN April 2011 Hardware
  • Emulating the 128KeIt occurs to me that I wasn't frequenting WoSf when I created the 128Ke standard, which means some people haven't heard of it. Here it is: [url]http…

    ... puts the I register in contended memory, which is a no ...
    gasman gasman April 2011 Emulators
  • Emulating the 128KeIt occurs to me that I wasn't frequenting WoSf when I created the 128Ke standard, which means some people haven't heard of it. Here it is: [url]http…

    ... that banks 4-7 are contended as per the +2A, rather ...
    zub zub April 2011 Emulators
  • Emulating the 128KeIt occurs to me that I wasn't frequenting WoSf when I created the 128Ke standard, which means some people haven't heard of it. Here it is: [url]http…

    ... puts the I register in contended memory, which is a no ...
    chev chev April 2011 Emulators
  • Emulating the 128KeIt occurs to me that I wasn't frequenting WoSf when I created the 128Ke standard, which means some people haven't heard of it. Here it is: [url]http…

    ... compatibility of all)
    +2A contended banks (because the original banks ...
    chev chev April 2011 Emulators
  • contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …

    ... have written for the +3 contended memory model?

    would ... have written for the +3 contended memory without realising it?
    BiNMaN BiNMaN April 2011 Hardware
  • contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …

    ... have written for the +3 contended memory model?[/quote]

    contended memory without realising it?[/quote ...
    chev chev April 2011 Hardware
  • 50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…

    ... to have to deal with contended I/O on the 128 ...
    chev chev April 2011 Development
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