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  • 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 …

    ... multicolour effects on the original 128K Speccy... as far as I ... 's only been done on contention-less Russian clones so far ...
    gasman gasman March 2011 Development
  • Emulating the 128KeIt occurs to me that I wasn't frequenting WoSf when I created the 128Ke standard, which means some people haven't heard of it. Here it is: [url]http…

    ... the difference is from a 128K, especially with regards to timings ... effect
    no I/O contention (can run many Pentagon demos ... choosing between the 48K and 128K manually...[/QUOTE]

    ... It is more compatible with 128K software than the original 128 ...
    chev chev April 2011 Emulators
  • 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 …

    ... I would expect that most 128k software would have been written ... , there again if a 128k game was written using the ... documentation specifies the +3's contention model.

    [quote] ... not taking into consideration any 128k clones[/QUOTE]

    ...
    chev chev April 2011 Hardware
  • So what is the best Spectrum?I've had a search and even though i can remember a similar thread somewhere I'll twist it a bit. Whats the best "unmodified" Spectrum? (modification…

    ... has the "wrong" contention logic like the sinclair 128k, and the build ...
    guesser guesser April 2011 Sinclair Miscellaneous
  • So what is the best Spectrum?I've had a search and even though i can remember a similar thread somewhere I'll twist it a bit. Whats the best "unmodified" Spectrum? (modification…

    ... 1985 Spain 3.5469 32K 128K 128K 13.5K 2 128, 48 ... 1986 UK 3.5469 32K 128K 128K 13.5K 2 128, 48 ... 1987 UK 3.5469 64K 128K 128K 13.5K 2 +3, 48 ... and +2 have the 'wrong' contention and contend all I/O ...
    chev chev April 2011 Sinclair Miscellaneous
  • So what is the best Spectrum?I've had a search and even though i can remember a similar thread somewhere I'll twist it a bit. Whats the best "unmodified" Spectrum? (modification…

    ...
    Best Visuals - the Spectrum 128k (toastrack)
    Best construction - the ... its 128k and while not the published of memory contention models ... br /> 1x 128K Toast Rack
    2x 128k +2 Fully ... power)
    1x Spectrum 128k +2e (needs tape-deck repair ...
    Zetr0 Zetr0 April 2011 Sinclair Miscellaneous
  • So what is the best Spectrum?I've had a search and even though i can remember a similar thread somewhere I'll twist it a bit. Whats the best "unmodified" Spectrum? (modification…

    ... has the "wrong" contention logic like the sinclair 128k, and the build ...
    AndyC AndyC April 2011 Sinclair Miscellaneous
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... not?[/QUOTE]

    The 128k models are slightly faster (70908 ... they have no low memory contention).

    This screws up ...
    Metalbrain Metalbrain May 2011 Games
  • 128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…

    ... :

    [code];; Distinguish between 128K and +3 by looking at ... understood the circumstances when IO contention is applied to the 0x7ffd ... induces memory paging on the 128K (and doesn't on the ... ). Well known bug in the 128K ULA.[/quote]

    For ...
    csmith csmith July 2011 Hardware
  • 128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…

    ... for comparison?

    The contention circuit is a headache to ... Sinclair changed it in the 128K Spectrum. The operational behaviour ... MREQ going low latches the contention state until the end ... of the contention period - which suggests it ...
    csmith csmith July 2011 Hardware
  • IDE Hard Drive on your Spectrum!Hello there my fellow WoS'ers Today, I am going to share with you something that has truly captivated me over the last couple of months, some of you…

    ... the lesser machines - like the 128k and 48k machines. My hope ... or disable memory and ports contention can be disable/enable.
    velesoft velesoft August 2011 Development
  • BETA-DISC (TR-DOS) support in ZX emulatorsBETADISC 128 is original device designed for external use with ZX Spectrum 128/+2(grey). Russians ZX clones (Pentagon, Scorpion, ZX profi, Quorum, ZX…

    ... works on standard zx 48k/128K ?[/QUOTE]

    90% of ... ZX models is incompatible, memory contention on all ZX models is ...
    velesoft velesoft September 2011 Emulators
  • What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…

    ... the contention as per sinclair's spec rather than what the 128k ... compromise between the various different 128k machines [url]http://scratchpad.wikia ...
    guesser guesser November 2011 Hardware
  • What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…

    ... 4-7 contended with the 128K's contention patterns will result in ...
    Philip Kendall Philip Kendall November 2011 Hardware
  • What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…

    ... than it does on the 128K.

    Sinclair never make ... /> My advice, make the bank contention model switchable - either a jumper ... still be a difference between 128k models... But don't quote ...
    csmith csmith November 2011 Hardware
  • What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…

    ... would be games developed for 128K heatsink model, as Amstrad models ... the bulk of software from 128K heatsink era.

    [QUOTE ... ]My advice, make the bank contention model switchable - either a jumper ...
    RetroTechie RetroTechie November 2011 Hardware
  • Double Dragon Remake: The Development ThreadOk guy's, so this is the new thread that will be focusing on Jim Bagley's development of the Double Dragon remake that was first proposed by myself a…

    ... /> They are listed in the 128k reference on the Sinclair FAQ ... /> All the rest of the contention stuff could be wrong though ... [/url]

    summary:
    128k and +2: pages 1 3 ...
    guesser guesser February 2012 Development
  • 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…

    ... linked, timing varies between 48K, 128K, +2A (and Pentagon) machines, but ... a Pentagon (which has no contention) or a real Speccy. Then ...
    joefish joefish February 2012 Development
  • New software screenmode: aSmpI was planning to release this tool at Forever XIII, but they didn't accept it, this is my 30th year activity, my most ambitious work on zx spectrum …

    ... this is not pentagon, not 128k buffered images, these are for ... the tool already supports 128k and +3 ula contention timings. I wanted ...
    Arda Arda March 2012 Announcements
  • Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…

    ... border) as used in Spectrum 128K with "early timing"
    [*] 2 ... to an "early timing" Spectrum 128K)
    [*] SpecEmu is the only ... have correct timing for memory contention but wrong timing for border ...
    Einar Saukas Einar Saukas April 2012 Emulators
  • BorderTron 3000A little bit of speccy-related fun for a Friday afternoon... I've knocked together a program for Windows which I've called Bordertron 3000 (a suitabl…

    ... a 48K or 128K machine doesn't remove contention. If you're ...
    chev chev April 2012 Announcements
  • Spectrum30 Show in Cambridge, 08th-09th September 2012Hello Spectrum-fans, after many months of preparation we now proudly present what will be the biggest Spectrum venue of the last 20 years. We manage…

    ... the sub-instruction timing and contention to get the colour routines ... that something designed for the 128K might not port back, so ... top-border delay for the 128K and hope.

    It ... the downside - there's no contention!

    It doesn't ...
    joefish joefish May 2012 Sinclair Miscellaneous
  • Playing SID music on AY??Hello. Some time ago, with occasion of another thread, I was asking about possibility of making a very certain thing - a SID emulator for Spectrum …

    ... 4.8MHz once you take contention into account). I have improved ... [/i] SID tunes on a 128K+ (or 48K with AY plugged ...
    obo obo May 2012 Development
  • PZX on WOS ?Is the PZX format accepted on WOS, at least for new production ? (Sorry, if this is wrong section, it looks to me as most suitable for the question.)

    ... /> [/QUOTE]

    Is the 128k spectrum a clone because it ... sure if I would define contention as the defining characteristic of ...
    Alcoholics Anonymous Alcoholics Anonymous May 2012 MIA/STP/SDP
  • 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…

    ... ]The 128K/128K+2 have different contented memory banks from 128K+3/128K+2A ... -B ??[/QUOTE]

    The different contention just ... gets screwed up on the 128K/Grey +2 MkI. Don't ... may still have the wrong contention).
    chev chev June 2012 Emulators
  • 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…

    [QUOTE=aowen;631304]The different contention just means that timing critical ... gets screwed up on the 128K/Grey +2 MkI. Don't ... may still have the wrong contention).[/QUOTE]

    Yes, and ...
    adorigatti adorigatti June 2012 Emulators
  • 48K/128K classificationI'm sorry if I've looked in the wrong places and not found it, but what are the rules regarding a game being listed as either: ZX Spectrum 48K ZX Sp…

    ... original Ultimate releases)
    * requires 128K of RAM (most 128 software ... 3)
    * requires original 128 contention (this only seems to affect ...
    chev chev June 2012 Infoseek database
  • Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…

    ... br /> [*] Memory contention is identical to Spectrum 128K/+2, except it ... also depends on memory contention to keep everything synchronized ... the same contention pattern, since a different contention pattern ( ... the same contention pattern as the Spectrum 128K but ...
    Einar Saukas Einar Saukas August 2012 Emulators
  • Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…

    ... are identical to Spectrum 128K/+2, except everything ... there's no memory contention afecting this operation, thus ... contention.

    Moreover, the difference between Spectrum 128K ... and TK90X were exactly 5602T, so it matches the memory contention ...
    Einar Saukas Einar Saukas August 2012 Emulators
  • Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…

    ... correctly emulating that memory contention and main video updates ... "normal" (non-late) ZX-Spectrum 128K timings.

    However ... than "normal" ZX-Spectrum 128K. This is incorrect by ... earlier than "normal" Spectrum 128K. In particular, running program ...
    Einar Saukas Einar Saukas August 2012 Emulators
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  • WANTED: 128k+ or 128k +2(early grey mod.) ULA chipHello,<br /> Attempting to repair my 128k+ speccy.<br /> Needs a ULA(IC1)chip from either a 128k+ or an early +2 will work also.<br /> If anyone has …
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  • 128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though.<br /> <br /> What I'm lack is a …
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