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  • Precisely timed loops in assemblyI'm looking for a way to make my code stop until the raster has reached the lower screen border (right after having drawn the last pixel line). I und…

    ... it's not running in contended memory).

    I take ... do a repeated write into contended memory, counting between two interrupts ...
    joefish joefish February 2012 Development
  • Occasional noise over RGB on +2AHi all I have a +2A that is misbehaving at the moment. I'm using the RGB to SCART lead (which incedentally is great on my +3) The problem is, the …

    If it's not a TV issue then looking at the way the picture is corrupted I'd be looking for possibly shorts on the data bus to the contended ram chips. (between IC1 and IC3/IC4)
    guesser guesser February 2012 Hardware
  • Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …

    ... the CPU is reading/writing contended memory - if the generated CPU ... clock isn't properly contended it can cause hangs and ...
    JeffB JeffB February 2012 Hardware
  • RFC: Hardware Documentation ProjectI've noticed quite a few threads recently about missing schematics and suchlike. I've also been thinking about the low quality of some of the schemat…

    ... a RAM failure in non-contended area
    [url]http://www ... misdiagnosed as having damaged non contended memory.
    [url]http://www ...
    mcleod_ideafix mcleod_ideafix March 2012 Sinclair Miscellaneous
  • Maritrini and Cray 5 loading problemsHas anyone else here had issues loading either of these on a 128k? No matter what I try, both these games refuse to load properly. I can get both t…

    ... and the refresh mechanism, if contended memory is paged in.
    contended ram was paged in, but ...
    AndyC AndyC March 2012 Games
  • New project: CargandoLeches. Ultraloads with ROMHi This project has started months ago, between decicoder, macleod and me. Uses the best modulation of k7zx (throwing shavings). But this ultraloa…

    ... precise, thus SAVEing from a contended memory zone will make samples ...
    mcleod_ideafix mcleod_ideafix March 2012 Development
  • New project: CargandoLeches. Ultraloads with ROMHi This project has started months ago, between decicoder, macleod and me. Uses the best modulation of k7zx (throwing shavings). But this ultraloa…

    ... precise, thus SAVEing from a contended memory zone will make samples ...
    mz-fuzzy mz-fuzzy March 2012 Development
  • Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…

    ... pointing to an area in contended memory even when interrupts are ... ULA fails to read from contended memory, leading to the odd ... that any code executed in contended memory will (sooner or later ... . Your routines can be in contended memory without problem, as long ...
    Jmk Jmk March 2012 Emulators
  • A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…

    ... address you want (even inside contended memory):

    POKE 64954 ...
    Einar Saukas Einar Saukas March 2012 Brand new software
  • Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…

    ... previous releases page in a contended memory bank while I contains ... $C0 and $FF, AND a contended page is set in $C000 ...
    mcleod_ideafix mcleod_ideafix March 2012 Emulators
  • Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…

    ... ) is set to this slow (contended) memory, ZX is very unstable ...
    mcleod_ideafix mcleod_ideafix March 2012 Emulators
  • Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…

    ... previous releases page in a contended memory bank while I contains ... $C0 and $FF, AND a contended page is set in $C000 ...
    na_th_an na_th_an March 2012 Emulators
  • Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…

    Hmmm I'll double-check, but I thought I had.
    Is "0" a proper value for the I register to avoid the effect? 'cause that's what I'm using. I guess it is, the ROM is not contended...

    PS Thanks for trying :)
    na_th_an na_th_an March 2012 Emulators
  • Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…

    ... is, the ROM is not contended...[/QUOTE]

    Yes, 0 ...
    Jmk Jmk March 2012 Emulators
  • Maritrini and Cray 5 loading problemsHas anyone else here had issues loading either of these on a 128k? No matter what I try, both these games refuse to load properly. I can get both t…

    ... the I register is in contended RAM on a 48K, Toastrack ...
    nuggetreggae nuggetreggae March 2012 Games
  • ULA snowHow is this feature implemented in emulators ? And how exact is the emulation ? I somehow supposed that ULA snow is something that is not very determ…

    ... "I" can never point to contended areas, even when interrupt is ... and $C000, and $C000 is contended?)
    Timmy Timmy March 2012 Emulators
  • ULA snowHow is this feature implemented in emulators ? And how exact is the emulation ? I somehow supposed that ULA snow is something that is not very determ…

    I shouldn't point to contended memory, even whilst interrupts are ...
    AndyC AndyC March 2012 Emulators
  • ULA snowHow is this feature implemented in emulators ? And how exact is the emulation ? I somehow supposed that ULA snow is something that is not very determ…

    ... "I" can never point to contended areas, even when interrupt is ... and $C000, and $C000 is contended?)[/QUOTE]


    ... /> $BFxx and $C0xx is not contended unless you are referring to ... the memory bus) it causes contended RAM to be selected.
    BloodBaz BloodBaz March 2012 Emulators
  • Issue 3B only sees 16k (and RAMTOP NO GOOD on loading)A ZX+ with issue 3B board that i got recently, does not see anything more than 32768 (sometimes 37267..) on "PRINT PEEK 23732 + PEEK 23733 * 256 (Ent…

    ... every address in top (non contended) RAM.

    Do a ...
    mcleod_ideafix mcleod_ideafix March 2012 Hardware
  • ULA snowHow is this feature implemented in emulators ? And how exact is the emulation ? I somehow supposed that ULA snow is something that is not very determ…

    ... "I" can never point to contended areas, even when interrupt is ... I >= $C0 and a contended RAM page is paged in ...
    na_th_an na_th_an March 2012 Emulators
  • Issue 3B only sees 16k (and RAMTOP NO GOOD on loading)A ZX+ with issue 3B board that i got recently, does not see anything more than 32768 (sometimes 37267..) on "PRINT PEEK 23732 + PEEK 23733 * 256 (Ent…

    ... every address in top (non contended) RAM.

    Do a ...
    Asure Asure March 2012 Hardware
  • ULA snowHow is this feature implemented in emulators ? And how exact is the emulation ? I somehow supposed that ULA snow is something that is not very determ…

    ... I >= $C0 and a contended RAM page is paged in ...
    Arjun Arjun March 2012 Emulators
  • ULA snowHow is this feature implemented in emulators ? And how exact is the emulation ? I somehow supposed that ULA snow is something that is not very determ…

    ... 0) before paging in the contended RAM pages. As I always ...
    na_th_an na_th_an March 2012 Emulators
  • ULA snowHow is this feature implemented in emulators ? And how exact is the emulation ? I somehow supposed that ULA snow is something that is not very determ…

    ... could say I = contended area and PC = contended area and then put ... a snow warning when I = contended?
    Jmk Jmk March 2012 Emulators
  • 28-character wide multicolour(ish) on 48k SpectrumLong-time lurker here... I've always been interested in rainbow effects on the 48k Spectrum, mainly from a perspective of "Just what [I]would [/I]ha…

    ... -states longer (or 8 if contended) than the other PUSH instructions ...
    joefish joefish April 2012 Development
  • 28-character wide multicolour(ish) on 48k SpectrumLong-time lurker here... I've always been interested in rainbow effects on the 48k Spectrum, mainly from a perspective of "Just what [I]would [/I]ha…

    ... -states longer (or 8 if contended) than the other PUSH instructions ...
    R-Tape R-Tape April 2012 Development
  • 28-character wide multicolour(ish) on 48k SpectrumLong-time lurker here... I've always been interested in rainbow effects on the 48k Spectrum, mainly from a perspective of "Just what [I]would [/I]ha…

    ... using LD a,(22528 ) --a contended instruction to keep everything in ... on machine state, but a contended instruction makes it on sync ... better to use a long contended instruction now and then to ...
    Arda Arda April 2012 Development
  • Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …

    ... , are all located into non contended RAM.

    Depending upong ...
    mcleod_ideafix mcleod_ideafix April 2012 Hardware
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