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  • 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 …

    ... to fix the I/O contention and the dirty bus?[/QUOTE ... ZX128+2A/+3)
    - new memory layout for slow and fast ...
    velesoft velesoft April 2011 Hardware
  • 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…

    ... 525740]Software written for correct contention that crashes the original 128 ... by this characterisation of one contention pattern as being the " ... when run under the wrong contention patterns? The only place I ... the I register in contended memory, which is a no-no ...
    gasman gasman April 2011 Emulators
  • 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…

    ... yes, the 128's contention pattern is 'wrong'. But ... software requires the +2A contention. I'm aware that ... run under the wrong contention patterns? The only place ... I know of where contention is related to crashing ... I register in contended memory, which is a no ...
    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 …

    ... written for the +3 contended memory model?[/quote]

    contention model.

    [ ... for the +3 contended memory without realising it?[/quote]
    contention model than the 128 contention model because the ...
    chev chev April 2011 Hardware
  • writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…

    ... is the emulated Speccy's memory map.
    2. When you ... is a bitmapped area of memory starting at location 16384 in ... the memory map, 6912 bytes long), and ... 't emulate the beeper or memory/port contention.

    Come back ...
    ccowley ccowley April 2011 Emulators
  • 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…

    ... writing to port 0x3ffd activates memory paging. To quote from ... corrected the contention handling for IO where a contended memory bank is ... understood the circumstances when IO contention is applied to the ... i] from that port induces memory paging on the 128K ( ...
    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…

    ... rewritable flash eprom. Use DivIDE memory mode (work with all ... end of 1MB ram), ZX memory expansion to Pentagon 1024, ... DIVIDEMB02+, TR-DOSMB02+). In one memory can be used up to ... RAINING" effect or disable memory and ports contention can be disable/enable ...
    velesoft velesoft August 2011 Development
  • Barleywood Z80 Simulator LicenceHi All, Does anybody know if it is still possible to get a Licence for this Simulator? The reason I ask is that I'm currently using it to develop a…

    ... wouldn't have accurate memory access simulation (considering contention, etc...), nor would ...
    Metalbrain Metalbrain October 2011 Development
  • Spectrum real speed testI don't have a real Spectrum, but I have a Romanian clone (HC-91). I always believed it was a perfect clone of Spectrum, but it turned out not to be…

    ... on ZXSpin with the 'No contention' option enabled and there is ... does not use the contented memory.

    But my Romanian ... to have ULA-CPU contented memory, because if I ran the ...
    Bothkill Bothkill October 2011 Sinclair Miscellaneous
  • Distinguishing between models?I'm running the risk of being pointed to the faq here, so sorry in advance. Something I'm trying out requires that the program can distinguish betwe…

    ... = test adress space contention (slow ports, slow memory pages,etc...)

    contention (ports with A0=1 is ... fast). Test of contention ports adress space will with ...
    velesoft velesoft November 2011 Development
  • 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…

    ... which does I/O contention, I should go for ... a 128K contention pattern, as the 128K ... ULA does implement I/O contention as well. Well, honestly ... much more scarce than memory operations, aren't they ... will be because the memory operations they will perform, ...
    mcleod_ideafix mcleod_ideafix 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…

    ... are much more scarce than memory operations, aren't they ... the 48K/128K ULA applies contention at every available opportunity, ... ULA applies it only while memory is actually being accessed. ... />
    Also, the basic contention pattern is different between the ...
    Philip Kendall Philip Kendall November 2011 Hardware
  • 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…

    ... move the screen buffer from memory to where you can see ... byte (or more due to contention), LDI takes 16, and PUSH ... (or 16 when there's contention), but there's a big ...
    Metalbrain Metalbrain January 2012 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…

    ... optimise the code to avoid contention, and you end up having ... (eating up a lot of memory) to realise even the smallest ...
    joefish joefish January 2012 Sinclair Miscellaneous
  • Loading the display with data from memoryTrying to load part of the screen(4k's worth) with data from memory location 53000, I've written this routine, but it doesnt work... [I]ld b,4000 ld…

    ... be faster, without being very memory extensive to make a 128 ... the operation (and allow for contention).
    rich_chandler rich_chandler January 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…

    ... 's not running in contended memory).

    I take the ... a repeated write into contended memory, counting between two interrupts, to ... a Pentagon (which has no contention) or a real Speccy. Then ...
    joefish joefish February 2012 Development
  • Shadow registers.I assume it's faster to transfer the registers to the shadow registers rather than using the stack? Let's say that I want to temporarily preserve the…

    ... cycles each, assuming the memory isn't in contention. Or add on ... using it to actually address memory, the IX/IY instructions only ... or write an address in memory, there's a bit longer ...
    joefish joefish March 2012 Development
  • Shadow registers.I assume it's faster to transfer the registers to the shadow registers rather than using the stack? Let's say that I want to temporarily preserve the…

    ... cycles each, assuming the memory isn't in contention. Or add on ... using it to actually address memory, the IX/IY instructions only ... or write an address in memory, there's a bit longer ...
    Shaun.Bebbington Shaun.Bebbington March 2012 Development
  • 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…

    ...
    Machine type: +3
    Contention offset: 0x08

    BIT ... =0x01)
    Contended memory... passed
    High port contention 1... passed
    High port contention 2... passed
    Alessandro Grussu Alessandro Grussu April 2012 Emulators
  • 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 ... their own fit amongst the contention by trial and error. It ... memory isn't contended, but on the downside - there's no contention ...
    joefish joefish May 2012 Sinclair Miscellaneous
  • 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…

    ... memory isn't contended, but on the downside - there's no contention ...
    chev chev May 2012 Sinclair Miscellaneous
  • ZX Spectrum ULA core available at OpenCoresHi! On April, 23th, I opened a new project at the OpenCores website: [url]http://opencores.org/project,zx_ula,Overview[/url] Right now, it has a, h…

    ... VHDL but without the memory and I/O contention.

    Hopefully ...
    JonS JonS May 2012 Hardware
  • 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 …

    ... to +2A/+3 Spectrum models. Memory accesses are passed straight through ... 4.8MHz once you take contention into account). I have improved ...
    obo obo May 2012 Development
  • Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…

    ... /> Machine type: unknown
    Contention offset: 0x00

    Contended memory... failed (0x7f)
    High port contention 1... failed ... (0x7f)
    High port contention 2... failed(0x7f)
    contention" and "iocontention" from ...
    Einar Saukas Einar Saukas May 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…

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

    The different contention just means that timing critical ... may still have the wrong contention).
    chev chev June 2012 Emulators
  • DIY AY for 48k schematicHello! I can't seem to find a diy schematic for attaching AY to 48k so it gets 128k compatible sound. I see offers to sell ready made devices, but n…

    ... as it used to make contention in the RAM).[/QUOTE]
    memory access[/I][/B]. This clock ...
    ArtemKuchin ArtemKuchin June 2012 Hardware
  • DIY AY for 48k schematicHello! I can't seem to find a diy schematic for attaching AY to 48k so it gets 128k compatible sound. I see offers to sell ready made devices, but n…

    ... [B][I]interrupted during contended memory access[/I][/B]. This clock ... clock, but some of the contention cycles are too long for ... if there was too much contention going on my regenerated clock ... before the next period of contention)
    Winston Winston June 2012 Hardware
  • 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 …

    ... correct ula emulation (including memory and ir contention). As you provide mlt ...
    Arda Arda July 2012 Announcements
  • Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…

    ... original timings for video access memory. It's possible avoid the ... memory access for the 8 lines ... the saving time (because less contention is needed) is insignificant IMHO ...
    antoniovillena antoniovillena July 2012 Development
  • ULA bug and snowI am tryng to improve the snow emulation in FBZX wii but I do not have a real spectrum to test the results. I used the information taken from Harele…

    ... is not caught by the contention handler, and causes a CPU ... pair fetch, it causes the memory to latch the lower seven ... a scroll, by forcing the memory to latch his row address ...
    csmith csmith August 2012 Emulators
<1…17181920212223…34>

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