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  • ZX Spectrum 48K working as 16K from factoryGood morning I Have a Zx Spectrum 48k working as 16K , it came like this from factory. What can i do to solve this , and put it to work as 48K? Wha…

    ... the help

    The memory test program didn?t worked ( shows ...
    camaisin camaisin July 2013 Hardware
  • ZX Spectrum 48K working as 16K from factoryGood morning I Have a Zx Spectrum 48k working as 16K , it came like this from factory. What can i do to solve this , and put it to work as 48K? Wha…

    ... should see that in your test, bit 5 seems to be ... . You should then run the memory test program I posted. It will ... very simple POKE & PEEK test.

    If it turns ...
    Zorn Zorn July 2013 Hardware
  • 30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…

    ... columns running multicolor 8x1 from contended memory:

    [CODE] ; 15905T
    Einar Saukas Einar Saukas August 2013 Development
  • 30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…

    [QUOTE=Einar Saukas;716398]I got 12 columns running multicolor 8x1 from contended memory[/QUOTE]

    Ok, so is there enough RAM for the unrolled loop to do 6x6 tiles?
    chev chev August 2013 Development
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... /> 1. POKE-ing the video memory locations directly.

    I ... , when I do this, the memory test appears, then the copyright message ...
    Trafferth Trafferth August 2013 Hardware
  • Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…

    ... new PC actually fetched from memory?[/quote]

    Yes, it ... asking is to do with memory contention. If the byte(s ... , getting your code out of contended memory is the *first* thing to ...
    gasman gasman August 2013 Development
  • Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…

    ... , getting your code out of contended memory is the *first* thing to ...
    u6c87 u6c87 August 2013 Development
  • Corrupt paper on zx spectrum 48kHi. When I power up my spectrum (issue 3) I get the light grey border, but the paper is black and it switches between thin red vertical lines and thi…

    The memory of a 48k Spectrum is ... . Each chip covers 16,384 memory locations but only stores one ... to use a ROM based memory test program. There are a number ...
    1024MAK 1024MAK August 2013 Hardware
  • Possible dodgy +2 - resets when loadingSo I have a grey model +2 with a recently refurbed tape deck (new belts and cleaned heads). It might be a product of bad loading, but from what I ca…

    ... this? I suspect there are memory test programs I can use, but ... quick look for a 128K memory test program and couldn't find ...
    RobeeeJay RobeeeJay August 2013 Hardware
  • fire n iceHi does anyone have or know where i can get a tape version of fire n ice? it's the homebrew game of the sequel to solomons key, i think it was russ…

    TRD files can be loaded without problems on real ZX128 with DIVIDE (system ESXDOS). But this game is writed for fast ram (zx clones) and original ZX Spectrum models with 128kB use contended memory pages = game speed and ay music are unstable.
    velesoft velesoft August 2013 Wanted
  • ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…

    ... that doesn't have any contended memory and the cpu clock is ...
    Mp Mp September 2013 Hardware
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... screen. Maybe some kind of memory allocation?[/QUOTE]

    memory, and
    ' ... br /> ' During menu screen, memory is used as follows:
    ' located in contended memory, thus leaving uncontended memory available for
    ...
    Einar Saukas Einar Saukas September 2013 Development
  • Issue 4A black paper, white borderJust had one of these through, nice yellow pcb! Everything but the ULA soldered in. On power up I get black paper, white border and some intermitten…

    ... nature of the start up memory test. Unless the problem is with ... bits 0 and 1, the test won't catch the issue ... test passes, thus the ROM code thinks that 48k of healthy memory ... the stack in faulty upper memory, all hell breaks loose :)
    balford balford October 2013 Hardware
  • Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…

    ... previous post assumes uncontended memory. If using contended memory (for instance copying from ... as follows:

    A contended sequence of [B]PUSHes[/B ... = 2.5T per byte. A contended sequence of [B]LDI[/B ...
    Einar Saukas Einar Saukas October 2013 Development
  • Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…

    [QUOTE=Einar Saukas;730325]A contended sequence of [B]LDI[/B] ... in contened zone (writing to contended memory from uncontended buffer), only the ... first contended LDI may take an extra ...
    Metalbrain Metalbrain October 2013 Development
  • Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…

    ... in contened zone (writing to contended memory from uncontended buffer), only the ... first contended LDI may take an extra ... copying blocks of data into contended memory (typically from buffer to screen ...
    Einar Saukas Einar Saukas October 2013 Development
  • Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…

    ... % faster when copying data to contended memory (except on Spectrum +2A/+3 ... be further optimized for running contended, the [B]LDI[/B] version ...
    Einar Saukas Einar Saukas October 2013 Development
  • Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…

    ... % faster when copying data to contended memory (except on Spectrum +2A/+3 ... be further optimized for running contended, the [B]LDI[/B] version ... 're talking about writing to contended RAM then hopefully we're ... put a buffer in a contended bank of the 128 if ...
    chev chev October 2013 Development
  • Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…

    ... avoid the screen located in contended RAM. It's a somewhat ... 're talking about writing to contended RAM then hopefully we're ... put a buffer in a contended bank of the 128 if ... 't put a buffer in contended memory of the Spectrum 48K either ...
    Einar Saukas Einar Saukas October 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... there because it's in contended memory, but you can put other ... right at the top of memory, so the game must've ... been mastered from a memory dump that was larger than ...
    stephenw32768 stephenw32768 October 2013 Development
  • Finders Keepers+I know a few of you are interested in this project so I thought it was about time I started a proper thread for it rather than just slipping bits int…

    ... reads and writes in video contended memory as this was something I ...
    David Jones David Jones November 2013 Development
  • Spectrum +3e acting up...Hello, Well, my Spectrum +3e is starting to act up. All 48k games load fine but now no 128k games will load :/ In one 128k game, in the beginning r…

    ... 3 has a built-in memory test (and other tests as well ... will start the full self-test program

    ... N.B, this test is NOT included in the ... come to the disk drive test, make CERTAIN that you ... disk will be formatted and test data written and read. ...
    The_Bert The_Bert November 2013 Hardware
  • Assembly code auto optimiserFor my Finders Keepers Plus project I'm considering writing an Assembly code auto optimiser. Way back when I wrote the original FK I considered optim…

    ... to build a graph in memory representing the complete execution flow ... for moving critical content into contended memory.

    At the end ...
    Einar Saukas Einar Saukas December 2013 Development
  • Very odd problemHmm, loaded up Sanxion on another 48k+ I have here only to find that when it had loaded there were no enemies on screen, furthermore on loading Atic …

    If a memory test checks out, you could try some tests normally used to test emulated Z80 implementations - this should rule out the CPU.

    [URL]http://mdfs.net/Software/Z80/Exerciser/[/URL]

    B
    balford balford January 2014 Hardware
  • Very odd problemHmm, loaded up Sanxion on another 48k+ I have here only to find that when it had loaded there were no enemies on screen, furthermore on loading Atic …

    With Paul Farrows 128k Memory test I get this;
    [url=http://postimg.org/image/bmhgm967v/][img]http://s17.postimg.org/bmhgm967v/IMG_0720_1.jpg[/img][/url]
    ULA checks out ok btw
    Macc Macc January 2014 Hardware
  • Port $28FF. Why 28?Testing floating bus behaviour for ZXUno, I've found that both Cobra and Arkanoid use this specific 16-bit port: $28FF. What is so special about putt…

    ... as an attempted access to contended memory and therefore introduces a delay ...
    Hikaru Hikaru February 2014 Hardware
  • New games - should they be 48K or 128K?Here's a question for new games - which machine should they be developed on? If I write a game for the 48K Spectrum, is it appreciated that it will …

    ... 128k models. On the 128ks, contended memory is everywhere, interrupted snow makes ... memory layout even more awkward, some ...
    Timmy Timmy March 2014 Development
  • FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…

    ... , especially when executing and accessing contended memory. Nowadays, I expect a 16550 ...
    zub zub March 2014 Development
  • FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…

    ... , especially when executing and accessing contended memory. Nowadays, I expect a 16550 ...
    tstih tstih March 2014 Development
  • 128+2 Help!Today the postie brought me an early Spectrum 128+2, it's a Z70700 Issue 1. Everything seems to be working ok, i.e it boots up and the keyboard work…

    ... will work better in non-contended RAM. The +2 grey Sinclair ... ://scratchpad.wikia.com/wiki/Contended_memory"]contended memory[/URL]) but as long as ...
    1024MAK 1024MAK April 2014 Hardware
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contended 1.2K 2K
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