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<1234567…34>
  • 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…

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

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

    Machine ...
    ajmoss ajmoss June 2010 Development
  • 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
  • Jet Set Willy Turbo edition!Improve the speed of the game with just a few pokes! Do the standard CLEAR 32767 : LOAD "" CODE to get at the BASIC loader (see Your Spectrum issue …

    ... ]
    It replaces the two LDIR instructions at $89C4 and $89FE ... -buffer wasn't kept in contended memory) The LDI instructions are ...
    Jimmy Jimmy May 2011 Sinclair Miscellaneous
  • Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…

    ... long time that uses an LDIR instruction to move the screen ...
    mjwilson mjwilson January 2012 Sinclair Miscellaneous
  • 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
  • Quickest way to fill the attributes using LDIRI'm looking for a small routine to fill the entire attribute area of the memory with a single value, I've used LDIR in the past, but forgotten how to…

    I'm looking for a small routine to fill the entire attribute area of the memory with a single value, I've used LDIR in the past, but forgotten how to do it... :confused:
    daveysludge daveysludge August 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
  • Addressing mode of LDIR and LDDRWhat addressing mode would the instructions LDIR and LDDR be classed as using? Would I correct in thinking that they're register indirect, as both t…

    What addressing mode would the instructions LDIR and LDDR be classed as using?

    Would I correct in thinking that they're register indirect, as both the source (HL) and destination (DE) registers are pointing into memory?
    cmonkey cmonkey January 2015 Development
  • 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
  • Let's copy buffers!Figured I'd do some double buffered graphics, so I can render for several frames before displaying stuff. Yes, I mean on a 48k speccy, so no 128k spe…

    ... value of scanline start)
    ldir
    [/code]
    [img]https ... particular emulator doesn't handle contended memory correctly, but relative differences ... optimization is to replace the ldir with 24 ldi instructions..
    Sol_HSA Sol_HSA April 2016 Development
  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... relocated the code to the contended memory (as was suggested by ...
    ld (hl),$fe
    ldir

    ld hl,$fefe ...
    Ast_A_Moore Ast_A_Moore February 2018 Development
  • [Asm] Is this nested loop faster than LDIR or a bunch of unrolled LDI's?Hi all. I'm learning Z80 asm on Speccy 48K, and to start with I decided to write my own "CLS" routine (without relying on ROM calls or LDIR) as a lea…

    ... relying on ROM calls or LDIR) as a learning exercise. What ... this code is faster than LDIR because that is operating on ...
    ST1 ST1 November 2018 Development
  • Method to read byte as binary string rather than dec?Hi all Am fiddling around with the screen buffer and have written a routine to scan the screenbuffer into upper ram and then write it back in upside…

    ... the screen) using a simple LDIR command would take about over ... account the delays caused by contended memory.
    But that's ...
    icabod icabod February 2006 Sinclair Basic
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... model something like LDIR, which has five single contended "steps" at the ...
    Philip Kendall Philip Kendall September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... model something like LDIR, which has five single contended "steps" at the ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …

    ... /> DAA... passed
    LDIR... failed (0xfb)
    Contended IN... failed (0xfd)
    Contended memory... failed (0x01)
    High ...
    gasman gasman November 2007 Hardware
  • Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …

    ... : 0x8000 + 0x94fc
    LDIR: failed (0x02)
    Contended IN failed: (0x02)
    Floating Bus failed: (0xff)
    Contended memory: failed (0x02)
    High ...
    Jon Needle Jon Needle November 2007 Hardware
  • Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …

    ... /> DAA... passed
    LDIR... failed (0xfb)
    Contended IN... failed (0xff)
    DAA... passed
    LDIR... failed (0x02)
    Contended IN... failed (0x02)
    Floating bus... failed (0xff)
    Contended memory... failed (0x02)
    High ...
    Mr. Anonymous Mr. Anonymous November 2007 Hardware
  • Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …

    ...
    DAA... passed
    LDIR... passed
    Contended IN... passed
    Floating ... bus... passed
    Contended memory... passed
    High port ...
    gasman gasman November 2007 Hardware
  • Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …

    ... /> DAA... passed
    LDIR... failed (0x05)
    Contended IN... failed (0x03)
    Floating bus... failed (0xff)
    Contended memory... failed (0x02)
    High ...
    Mr. Anonymous Mr. Anonymous November 2007 Hardware
  • Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …

    ...
    DAA... passed
    LDIR... passed
    Contended IN... passed
    Floating ... bus... skipped (B=0x01)
    Contended memory... passed
    High port ...
    Mr. Anonymous Mr. Anonymous November 2007 Hardware
<1234567…34>

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  • 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…
  • 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 - …
  • 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 …
  • Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said:<br /> <br /> [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg use…
  • 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…
  • Quickest way to fill the attributes using LDIRI'm looking for a small routine to fill the entire attribute area of the memory with a single value, I've used LDIR in the past, but forgotten how to…
  • +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…

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