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  • Brand new River Raid remake?one of my friend is trying to make a riverraid remake on flash just to have fun, I checked zx spectrum port of river raid. it is bad, really bad, jer…

    The 48K and 128K ULAs will apply extra contention under the right conditions ... +3 applies slightly more contention when contention is applied but has less ... points of contention within a number of opcodes ...
    Bob Stains Bob Stains May 2009 New game ideas
  • Which is the most technically accurate Spectrum Emulator?Ok, which is the most technically accurate Spectrum Emulator? Please don't just vote but give reasons why.

    ... 's tests when executed on 128k or +2A, and while fusetest ... 128k mode it fails the 4 final ones, including "High port contention ...
    Metalbrain Metalbrain June 2009 Emulators
  • Which is the most technically accurate Spectrum Emulator?Ok, which is the most technically accurate Spectrum Emulator? Please don't just vote but give reasons why.

    ... 's tests when executed on 128k or +2A[/quote]

    128K.

    [quote]"High port contention 2". I ...
    Philip Kendall Philip Kendall June 2009 Emulators
  • Noob to Z80 needing +3 helpI'm quite new to z80 programming, but i'm attempting to write some kind of windowing system that will run alongside BASIC on my +3 with Kempston mous…

    ... 2 due to the memory contention issue).[/QUOTE]

    No ... ]In normal operation of the 128k editor, if page 7 is ...
    glancaster glancaster July 2009 Development
  • The So What's This Buzzsaw All About Then? Thread.Erm. This: [URL="http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap"]http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap[/URL] Keys…

    ... ? And other emulated machines (48K, 128K, +2)?

    [QUOTE= ... /> 1. 48K Spectrum
    2. 128K / +2
    3. +3 / + ... each line, allowing for some contention. The Pentagon version takes exactly ... T-states per line, without contention.

    I'm ...
    joefish joefish August 2009 Development
  • The So What's This Buzzsaw All About Then? Thread.Erm. This: [URL="http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap"]http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap[/URL] Keys…

    ... mode, with the contention turned on. With the contention turned off, the ... line, somewhere betweeen the 48k/128K/+2 mode (215t) and the ...
    joefish joefish August 2009 Development
  • Should I buy a Sam Coupe?Hi folks I been interested with the Sam Coupe since Miles Gordon Technology released the SAM as the successor to the Spectrum. Are their any SAM us…

    ... of the 'new' emulators support 128K snapshots, or do you still ... ]

    Due to memory contention while the video is being ... emulators do not support 128K snapshots, but 128K games can be hacked ...
    Quazar Quazar August 2009 Chit chat
  • Should I buy a Sam Coupe?Hi folks I been interested with the Sam Coupe since Miles Gordon Technology released the SAM as the successor to the Spectrum. Are their any SAM us…

    ... =Quazar;376976]Due to memory contention while the video is being ... emulators do not support 128K snapshots, but 128K games can be hacked ...
    chev chev August 2009 Chit chat
  • Where's the border line between a Spectrum and something else?I mean: there are purists out there that consider that anything that is not a true Sinclair Spectrum, with a true Z80 and a true ULA, and at most, 48…

    ... the MSX.

    Even 128K models aren't 100% compatible ... constraints (Z80 undocumented opcodes, memory contention, floating bus, fixed number of ...
    Madonna Mk 2 Madonna Mk 2 August 2009 Development
  • Colour clash on the Commode64?Was there any? Every now and again, I see a screen shot like this... [img]http://www.lemon64.com/games/screenshots/full/j/jack_the_nipper_02.gif[/i…

    ... scroll registers to ULA when 128k machines came out... and maybe ... clash (several possibilities here, also 128k of memory was enough)... we ... would probably see better 128k only games then. :)[/QUOTE]
    contention.
    AndyC AndyC September 2009 Chit chat
  • AY interface - How many possibilities?Currently the newest AY interface available for sale gives 16K and 48K owners a chance to add AY sound to their Speccy, but (correct me if I'm wrong)…

    ... identical Spectrums, the amount of contention is very consistent over time ... account for that in my 128K+Fuller box experiment, and it ...
    gasman gasman October 2009 Hardware
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... have been for the original 128K Spectrum to have incorporated this ... 've always thought that the 128K Spectrum was a wasted opportunity ... memory contention could have been avoided?), but I hated the 128K's ... what?

    Was the 128K Speccy just a rush job ...
    ewgf ewgf December 2009 Emulators
  • Best Spectrum game from 2009Ok, its almost 2010, and we have to decide which was the best game this year :) Miles Mad Mission [url]http://www.worldofspectrum.org/infoseekid.cg…

    ... Spectrum 128kB.[/QUOTE]
    Pentagon 128K is not really Spectrum, though ... , with close timings and memory contention. Second generation (1990-1995), including ... Pentagon, has no memory contention and different timings (because it ...
    Shiru Shiru January 2010 Games
  • CPI emulationI'm currently writing Sinclairean's emulation assembly for the CPI/CPD/CPIR/CPDR instruction group. Does anybody know what exactly the behavior of th…

    All 5 are contended (48K/128K ULAs, not for the +2a/+3) with contention based on the address in HL. And there is no write as you say :)

    The same goes for the extra 5 for the repeating varieties.
    Woody Woody March 2010 Emulators
  • Resolution & Memory Question ...Hi, I'm hoping someone with some experience writing an emulator, or a vast knowledge of all things Spectrum can help me answer the following questio…

    ... places (it's not a 128K Speccy!).

    The first ... RAM, but without the interfering contention.

    The screen starts ...
    joefish joefish April 2010 Emulators
  • Mistake in the 128K technical FAQ?[url]http://www.worldofspectrum.org/faq/reference/128kreference.htm[/url] [quote]Memory banks 1,3,5 and 7 are contended.[/quote] Really? I thought i…

    ... over sample on either a 128k or +2 machine, and then ... them is clearly affected by contention and the other isn't ...
    Woody Woody April 2010 Hardware
  • "Programming the Spectrum in Assembly" series in Micro MartI see that Shaun Bebbington is starting a series of articles in Micro Mart magazine on how to program in assembly for those who might know a little b…

    A far bigger effect is that the +2A/+3 have less contention than the 48K/128K.
    Philip Kendall Philip Kendall June 2010 Sinclair Miscellaneous
  • "Programming the Spectrum in Assembly" series in Micro MartI see that Shaun Bebbington is starting a series of articles in Micro Mart magazine on how to program in assembly for those who might know a little b…

    ... +2A/+3 have less contention than the 48K/128K.[/QUOTE]

    In the +2A/+3 there are less contention ...
    Metalbrain Metalbrain June 2010 Sinclair Miscellaneous
  • "Programming the Spectrum in Assembly" series in Micro MartI see that Shaun Bebbington is starting a series of articles in Micro Mart magazine on how to program in assembly for those who might know a little b…

    ... -world algorithm which experiences more contention on a +2A/+3 than ... to find if a 128k model has 128k/+2 , +2A/+3 or ...
    Metalbrain Metalbrain June 2010 Sinclair Miscellaneous
  • Project OTLA / k7zx (high speed loading)Hello, I am proud fan of zx spectrum (I do not have speccy, but clones (Didaktik Gama, Didaktik M)), I am using portable CD player to load games. Al…

    ... be adding support for the 128k model's serial port. OTLA ... />
    As regards the memory contention, this is very true and ...
    kphair kphair July 2010 Sinclair Miscellaneous
  • Spectrum +2 wantedLooking for a fully working Spectrum +2 Dont need any games but if you got them then they are always welcome addition. I Will need the psu and the o…

    ... efforts to get an original 128k+. What a bloody polava.[/QUOTE ... , such as the wrong port contention, and that are hard to ...
    chev chev August 2010 Wanted
  • Memory mapping: Pentagon compatibility?I'm writing something that will rely heavily on the Spectrum's ability to switch screen buffers in hardware (port 0x7FFD). The original Spectrum 128K…

    ... universal paging scheme beyond the 128K. The Russian machines have no ... +2 have the wrong RAM contention (i.e. not what the ...
    chev chev August 2010 Hardware
  • Genesis: dawn of a new day, new game from RetroWorks!It's been a long development, but finally we made it. We proudly present the latest game from RetroWorks, Genesis: dawn of a new day. [img]http://ww…

    ... ...

    With it being 128K only, one of the first ... (to check the different RAM contention effect). If there is any ...
    utopian utopian November 2010 Games
  • The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…

    ... contention is in the right place?[/QUOTE]

    yes, the 128k ... sinclair manual.
    The +3 contention is built to the specifications ...
    guesser guesser December 2010 Hardware
  • The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…

    [QUOTE=guesser;495529]yes, the 128k (and +2) is the one ... sinclair manual.
    The +3 contention is built to the specifications ... seen the effect of memory contention being in the wrong place ...
    BiNMaN BiNMaN December 2010 Hardware
  • Xmas / NY present for all ZX UsersHi there, wasn't sure where this should go, but this is a couple of years "work" during free time while not in the office. This is a package of 480 o…

    ... filename should work on all 128K speccies, but due to me ... has a different contention pattern and no contention on ports so a ... **MUCH** faster than on the 128K. Some of the demos tagged ... +3) will still work on 128K, but if the music slows ...
    nuggetreggae nuggetreggae December 2010 Development
  • 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 …

    ... is not that the CPU contention timing is different, but ... 2B, or written assuming the contention in the manual will work ... /+2B but suffer on a 128k or +2.

    ... game was written for the 128k or +2 and fiddled ... twice the life of the 128k and +2. On the ...
    guesser guesser January 2011 Hardware
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ... memory? passed
    High port contention 1? passed
    High ... port contention 2? skipped (B=0x01)[/code]

    128K:
    High port contention 1? passed
    High port ... ? passed
    High port contention 1? passed
    High ...
    gasman gasman February 2011 Hardware
  • Push/Pop data copyingWe all know that stack pointer cheese and push/pop is faster to move data than LDIR - which in turn is slower than unrolled LDI's anyway. I rewrote …

    ... /> push hl ; 4T lost to contention
    push de ; 5T lost ... to contention
    push bc ; 5T lost ... to contention
    ld a,0 ; 7T ... , giving 228T total for the 128K - probably leave this out for ...
    gasman gasman March 2011 Development
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