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Search Again :: Adv Search 1000 results in 0.017s
<1…16171819202122…34>
  • Totally random idea for the hardware nuts to exploreWhen it comes to multi-player games, how hard would it be to generate a second display from a single Speccy, instead of trying to link up machines, s…

    ... speed boost by avoiding the contended memory.

    I had considered ...
    joefish joefish April 2014 Hardware
  • Address bus contents (i.e. PC) during execution of HALTI'm wondering if anyone can tell me what's placed on the address bus during execution of HALT, beyond the initial M1 cycle. The Z80 user manual state…

    ... the answer, though, in that memory refresh still occurs, and the ... of entropy and executes from contended memory, incorrect emulation of this would ...
    zub zub April 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    The RAM test that the ROM program does ... . It is not a full memory test.

    Some faults allow ...
    1024MAK 1024MAK April 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    [QUOTE=1024MAK;764954]The RAM test that the ROM program does ... . It is not a full memory test.

    Some faults allow ...
    Brian Brian April 2014 Hardware
  • Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…

    ... , the magic word here is "contended memory", it will make your current ...
    Ralf Ralf April 2014 Development
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... copyright message appears, as the memory test will have completed at that ...
    balford balford May 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... copyright message appears, as the memory test will have completed at that ...
    Brian Brian May 2014 Hardware
  • Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFFI haven't seen this documented anywhere yet so I thought I'd share my findings. I've been investigating contended memory timings on the Timex Sinclai…

    ... 2068. The section on contended memory timing also applies to the ... . All memory at $4000 - $7FFF on a Timex is contended, whether ... it is HOME RAM, EXROM, cartridge memory or ... bus expansion unit memory.
    rga24 rga24 May 2014 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…

    I haven't tried this yet. I never coded multicolors for contended memory before :)
    Alone Coder Alone Coder May 2014 Development
  • Fire n' Ice, is it possible to convert it tp tap. or tzx?Wathching a little bit the video from this game in rzxarchive, and it is really outstanding. So I was wondering if its possible to make the trd file …

    ... which doesn't have slow contended memory like the Speccys we're ... code to run higher in memory to get around the issue ...
    jamorski jamorski May 2014 Games
  • Fire n' Ice, is it possible to convert it tp tap. or tzx?Wathching a little bit the video from this game in rzxarchive, and it is really outstanding. So I was wondering if its possible to make the trd file …

    [QUOTE=Ivanzx;768708]Does that mean that it is incompatible? Or too big for normal Spectrum models? :)[/QUOTE]
    It have issue with contended memory, this is what I mean, it is designed to work on machines without contended memory like Pentagon.
    Shadow Maker Shadow Maker May 2014 Games
  • Spectrum+ keyboard issueHi I have a spectrum+ (issue 4s board) where the 1-5 keys do not work. I have replaced the membrane and checked for continuity. I have also tested …

    ... hard to do the simple memory test when keys 1 to 5 ...
    1024MAK 1024MAK June 2014 Hardware
  • Fire n' Ice, is it possible to convert it tp tap. or tzx?Wathching a little bit the video from this game in rzxarchive, and it is really outstanding. So I was wondering if its possible to make the trd file …

    ... really perectly playable, because of contended memory issues.
    Shadow Maker Shadow Maker June 2014 Games
  • AAAARRRRR DIV-MMC ENJOY againIve recently been posting trying to get to the bottom of problems with my +48 not working with this rechid addon.Now ive finaly worked out theres not…

    ... and TR5 for the RAM memory. So the loss of these ... 128k game or run a memory test, it is not possible to ...
    1024MAK 1024MAK July 2014 Hardware
  • Robocop 3 and Spectrum 128K toast-rackHi all, we are going on with the tests on the new 128K emulator for the V6Z80p board, and we have found something odd: Robocop 3 (designed for the 12…

    ... situation: register I pointing to contended memory

    Cheers

    chernandezba chernandezba July 2014 Emulators
  • anteater - new beeper engineJust letting y'all know about a little project I did yesterday, called "Write a beeper engine in 1 day". [url=irrlichtproject.de/downloads/anteater.…

    ... because the stack is in contended memory. CLEARing to a value in ...
    kphair kphair August 2014 Brand new software
  • Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…

    ... will be seen as a contended memory access when IORQ (also an ...
    balford balford September 2014 Hardware
  • Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…

    ... will be seen as a contended memory access when IORQ (also an ...
    1024MAK 1024MAK September 2014 Hardware
  • 48K Ram Check Command not workingI am trying to repair my Spectrum 48k. It is having issues loading games, sometimes they load all the way to launch and then the speccy resets. Oth…

    ... 8?

    Repeat the memory test BASIC commands and report back ...
    balford balford September 2014 Hardware
  • Issue 6 repair with a twist...(Starting with a slight grump - the forum ate my first attempt at this so this'll probably end up being a bit terse :)) I got a Issue 6 48K machine …

    ... Z80 implementation of a useful memory test.
    You may try this ... think this is quite detailed test detecting many errors using 4 ... patterns and a walking bit test. Not too much, just 2 ...
    PokeMon PokeMon September 2014 Hardware
  • Issue 6 repair with a twist...(Starting with a slight grump - the forum ate my first attempt at this so this'll probably end up being a bit terse :)) I got a Issue 6 48K machine …

    ... [/URL] for details of the memory testing.
    [/QUOTE]

    memory test go upwards only. The other ... this pattern only. The real memory tests do check AND change ... one run. So the simple memory test of the ZX81 with filling ...
    PokeMon PokeMon September 2014 Hardware
  • Issue 6 repair with a twist...(Starting with a slight grump - the forum ate my first attempt at this so this'll probably end up being a bit terse :)) I got a Issue 6 48K machine …

    ... well if you assume all memory is corrupt. IY is not ... 8k rom than just a memory test. But the more important point ...
    PokeMon PokeMon September 2014 Hardware
  • New Game: ZEN[IMG]http://i61.tinypic.com/r94r5f.png[/IMG] [IMG]http://i58.tinypic.com/2150kmd.png[/IMG] [IMG]http://i62.tinypic.com/308w4zo.png[/IMG] [IMG]http://…

    ... doesn't work properly in contended memory, so there's not much ...
    Einar Saukas Einar Saukas October 2014 Brand new software
  • Weird 1982 Copyright message after cap change.Hello All, As mentioned before I had a busted Issue 6 48K Spectrum+, one of the capacitors had leaked, and trashed the keyboard membrane ribbon. Us…

    ... is the result of the memory test)?

    [B][I]Mark ...
    1024MAK 1024MAK October 2014 Hardware
  • Weird 1982 Copyright message after cap change.Hello All, As mentioned before I had a busted Issue 6 48K Spectrum+, one of the capacitors had leaked, and trashed the keyboard membrane ribbon. Us…

    ... is the result of the memory test)?

    [B][I]Mark ... of anything else I can test, I'm wondering if it ...
    Korinel Korinel October 2014 Hardware
  • Pics of your Speccy set-up?Had a look and can't seem to find a thread on this. - Be interesting to see pic(s) of everyone's "go-to" Speccy, the one that they use regulary. I'…

    ... (unrainer and +2a/b/3 contended memory map) and stereo sound, DivIDE ...
    BiNMaN BiNMaN October 2014 Sinclair Miscellaneous
  • Pics of your Speccy set-up?Had a look and can't seem to find a thread on this. - Be interesting to see pic(s) of everyone's "go-to" Speccy, the one that they use regulary. I'…

    ... (unrainer and +2a/b/3 contended memory map) and stereo sound, DivIDE ...
    Glenn Glenn October 2014 Sinclair Miscellaneous
  • Alkatraz Protection System - "How to" and compo?I'm thinking about writing a "how to" regarding the [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0020807"]Alkatraz Protection System[/URL].…

    ... you would also specify which memory bank the code blocks should ... a suitable location in un-contended memory.
    It's important ... B]
    MEM - display free memory
    CLEAR - clear the current ... source code from memory
    BASIC - return to ...
    jp jp October 2014 Announcements
  • Banked memory running slower?I've just compiled a TAP which includes bank6, it loads ok, but the routines that are paged in run slightly slower. The Z80 snapshot has no such pro…

    Yup, it's a contended memory thing. Your snapshot version is ... /+3, where Page 6 is contended, the sound distorts because the ... being used and arrange the memory into different pages accordingly.
    AndyC AndyC October 2014 Development
<1…16171819202122…34>

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contended 1.2K 2K
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