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<1234567…34>
  • Games that crash because of contended memory.I find these are really annoying. You load up a game like Astro Marine Corps, Fantasy World Dizzy, Dizzy: Prince Of The Yolkfolk and so on (the init…

    ... the +2A/+3 having different contended banks...

    Anyway, I ...
    Jmk Jmk February 2006 Games
  • R Register, Contended RAM and ClonesHi. I've had a quick look at the CSS FAQ but didn't spot quite what I'm looking for (also the CSS FAQ doesn't have much detail of the clones - there …

    ... . What is the effect of contended RAM on the R-register ... not run any code in contended RAM, but I do make ... thing, but then without the contended RAM the HALT would take ...
    icabod icabod July 2006 Development
  • LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…

    ... describes the detailed timings of contended RAM. It gives timings ... residing in, or reading/writing, contended RAM.

    ... LDIR instruction in non-contended memory, and the source ... and destination (DE) addresses in contended memory.

    Machine ...
    ajmoss ajmoss June 2010 Development
  • Quick question regarding contended memoryIf I've read the documentation correctly, the following applies: 128k/+3 "Memory banks 1,3,5 and 7 are contended" +2A/B/+3 "RAM banks 4, 5, 6 and 7…

    ... ,3,5 and 7 are contended"

    +2A/B/+3 ... , 5, 6 and 7 are contended."

    That means, that ...
    Sdw Sdw May 2012 Development
  • +2 grey Contended RAMhi all, i have some quenstions about, contended RAM are banks 1,3,5,7 banks are the pairs of IC's (4164), so 1 pairs = 16k X 4 pairs = 64k this 64…

    ... some quenstions about,

    contended RAM are banks 1,3 ... logic

    now psysical, contended RAM are the IC's ...
    xaris_sm xaris_sm March 2013 Hardware
  • Contended Memory woes...Hello All, An iccle problem I have and was hoping one of you fine WoSers could bail me out again... :) I've noticed that my emulator is running sli…

    ... be an issue with the contended memory not working as it ... [/url]

    I implemented contended memory simplistically but I'm ... check if the access is contended and if so I slap ... an index.

    My contended table is correct.
    My ...
    Korinel Korinel June 2013 Emulators
  • 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…

    ... findings. I've been investigating contended memory timings on the Timex ... whether the CPU is accessing contended video memory or "uncontended" ROM ... might as well call this "contended ROM".

    This solves ...
    rga24 rga24 May 2014 Hardware
  • ZX Evolution -- contended memory and raster emulationFresh bleeding update for [url=http://www.nedopc.com/zxevo/zxevo_eng.php]ZX Evolution[/url] [url=https://code.google.com/p/pentevo/source/list]Baseco…

    ... [/url] -- raster and ULA contended memory emulation for original 48k ... rasters.

    2. Contended memory works only if you ... : for some help with raster/contended memory

    Mike ... your very valuable insight into contended memory topic and useful ...
    lvd lvd January 2015 Hardware
  • Contended memory and TritoneQuick question regarding contended memory...<div style="font-style: normal;"><br></div><div style="font-style: normal;">I'm testing ideas with Triton…

    Quick question regarding contended memory...
    I'm testing ... address and the data in contended memory, and it doesn't ...
    reidrac reidrac June 2015 Development
  • [NEW]: Spectaculator 4.0Hi everyone, Finally managed to finish it... enjoy! --- [NEW]: Spectaculator 4.0 Spectaculator is a Sinclair ZX Spectrum emulator for PCs runnin…

    ... .

    o Changed the contended memory model for the 128k ... ,3,5,7 are now contended rather than 4,5,6 ...
    Jon Needle Jon Needle January 2003 Emulators
  • Emulation accuracy and how it affects softwareHi folks. I was thinking of bodging together a rudimentary Spectrum emulator myself, not as a competitor to the other emulators, but as an integrate…

    ... FAQ.

    As for contended memory and finite-speed screen ...
    GOC GOC May 2004 Emulators
  • ANNOUNCE: Fuse for Mac OS X 0.7.0Following the release of Fuse 0.7.0 is the unsurprising release of Fuse for Mac OS X 0.7.0 which should be available for download shortly at the Fuse…

    ... ZXCF support.
    + Much improved contended memory and floating bus emulation ...
    Fred Fred July 2004 Emulators
  • (Belated) ANNOUNCE: Fuse 0.7.0 and libspectrum 0.2.2 releasedThe Fuse team is pleased to announce that release of Fuse 0.7.0, the associated utilities and version 0.2.2 of the Spectrum emulator support library,…

    ... ZXCF support.
    + Much improved contended memory and floating bus emulation ...
    Philip Kendall Philip Kendall July 2004 Emulators
  • A few questions regarding EmuZwinA few questions regarding EmuzWin 1. I have been trying to write a program to generate multicolour effects on the Spectrum,ie more than 2 attributes…

    ... have something to do with contended memory, but don't know ...
    dmsmith dmsmith August 2004 Development
  • A few questions regarding EmuZwinI had posted this in the development forum and then remembered there was an emulators forum, so apologies for the repetition. 1. I have been trying …

    ... have something to do with contended memory, but don't know ...
    dmsmith dmsmith August 2004 Emulators
  • How many T-states takes PUSH DE ?Hi. Just a quick one. According to z80.info docs, a PUSH DE should take 11 T-States to be executed. But WHAT if SP is pointing to Contended Memory,…

    ... if SP is pointing to Contended Memory, specially to the display ...
    AE.Vasconcelos AE.Vasconcelos April 2005 Development
  • Memory Map/ContentionHi I'm new to speccy coding (well I did some z80 coding a few years back - like 20yrs ago :) ), and I'd like to get back into writing some scrolling…

    ... bytes
    5B00-7fff 08k Contended Memory
    8000-FFFF 32k ...
    ZJones ZJones September 2006 Development
  • Which would be fasterSay you want to use a variable value of 0 to 255 in a BASIC program, which way would be fastest? Say for arguments sake you wanted to use two variabl…

    ... store the value in non-contended memory above RAMTOP, i.e ...
    ewgf ewgf September 2006 Development
  • ZX Spectrum +3 - incompatible ?Hello :) I'm newbie here. I know WOS site since years, never checked forum before ;) , but this moment came when I have problem. I wanna buy ZX Spe…

    ... the RAM banks were now contended causing high-speed colour-changing ...
    dax dax September 2006 Hardware
  • ZX Spectrum technical information wiki[With vague apologies for the multi-post] In order to push out updated information quicker than is currently happening with the [url=http://www.worl…

    ... ] and contains updated and improved contended memory information compared with that ...
    Philip Kendall Philip Kendall May 2007 Emulators
  • ZX Spectrum technical information wiki[With vague apologies for the multi-post] In order to push out updated information quicker than is currently happening with the [url=http://www.worl…

    ... ] and contains updated and improved contended memory information compared with that ...
    Philip Kendall Philip Kendall May 2007 Hardware
  • Harlequin ZX Spectrum Clone now 100% compatible!Hi all! The Harlequin ZX Spectrum clone now shows full timing compatibility with the ZX Spectrum! 8-) Both the ULA IO and memory contentions are fa…

    ... faithfully reproduced,
    along with contended and uncontended floating bus reads ...
    csmith csmith July 2007 Hardware
  • Compatible SpectrumsFollowing some recent coding exploits I've been thinking about compatibility of various models of ZX Spectrum. Yes, it's a common question on the for…

    ... /+3 had different pages of contended RAM (I think 1, 3 ...
    icabod icabod October 2007 Hardware
  • Ports AccelerationOn ZX48 or 128/+2(grey) is contended and uncontended ports. For example: if you will read 512 bytes sector from IDE device to ZX ram via INI or INIR,…

    ... or 128/+2(grey) is contended and uncontended ports.
    For ... , half of all ports will contended (slow down by ULA). ULA ... A14=1, ports is slow (contended)
    If A15=1 and ... is set, ports is slow (contended)

    Example of slow ...
    velesoft velesoft October 2007 Hardware
  • ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…

    ... .

    But how is contended memory refreshed? By constantly reading ...
    brian-82 brian-82 November 2007 Development
  • IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…

    ... bus cycle that might affect contended memory, and the ULA stops ... directed to the ULA) as contended I/O if A8-A15 ... is, IN 255 is not contended.

    Here you have ...
    mcleod_ideafix mcleod_ideafix January 2009 Hardware
  • How feasible is it to add a second CPU to the ZX Spectrum?Today with IDE, and USB, and TCP/IP and other wonderful technologies arriving on the ZX Spectrum, I'm beginning to wonder if we'll run out of CPU tim…

    ... and fourth?) Z80 shared our contended memory, then we could "easily ... CPU1, has access to the contended memory, but only when neither ...
    wilsonsamm wilsonsamm June 2009 Hardware
<1234567…34>

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Related Threads

  • Games that crash because of contended memory.I find these are really annoying.<br /> <br /> You load up a game like Astro Marine Corps, Fantasy World Dizzy, Dizzy: Prince Of The Yolkfolk and so …
  • R Register, Contended RAM and ClonesHi.<br /> I've had a quick look at the CSS FAQ but didn't spot quite what I'm looking for (also the CSS FAQ doesn't have much detail of the clones - …
  • LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…
  • 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 …
  • Quick question regarding contended memoryIf I've read the documentation correctly, the following applies:<br /> <br /> 128k/+3<br /> "Memory banks 1,3,5 and 7 are contended"<br /> <br /> +2A…
  • +2 grey Contended RAMhi all,<br /> <br /> i have some quenstions about,<br /> <br /> contended RAM are banks 1,3,5,7<br /> <br /> banks are the pairs of IC's (4164), so 1…
  • Contended Memory woes...Hello All,<br /> <br /> An iccle problem I have and was hoping one of you fine WoSers could bail me out again... :)<br /> <br /> I've noticed that my…
  • 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…
  • ZX Evolution -- contended memory and raster emulationFresh bleeding update for [url=http://www.nedopc.com/zxevo/zxevo_eng.php]ZX Evolution[/url] [url=https://code.google.com/p/pentevo/source/list]Baseco…
  • Contended memory and TritoneQuick question regarding contended memory...<br /> I'm testing ideas with Tritone player v2, putting the player code after 0x7fff memory address and …

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