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  • Has any one tried ZX Spectrum 4.net?In this week's Micromart, the Specccy emulator [I]ZX Spectrum 4.net[/I] is given a rave review, and it does sound really good. Has anyone tried it ye…

    ... reset on I pointing to contention memory, that will have to wait ...
    Arjun Arjun August 2012 Emulators
  • Has any one tried ZX Spectrum 4.net?In this week's Micromart, the Specccy emulator [I]ZX Spectrum 4.net[/I] is given a rave review, and it does sound really good. Has anyone tried it ye…

    ... reset on I pointing to contention memory, that will have to wait ...
    chev chev August 2012 Emulators
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... , and the associated CPU and memory timings.

    The ports ... , and have even more interesting contention issues - if it works at ...
    csmith csmith August 2012 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... same one that deals with contention that velesoft did? if not ... contended I/O and wrong contention errors but it might need ... same as earlier ULAs. The memory paging etc. is handled off ...
    chev chev September 2012 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... contended I/O and wrong contention errors but it might need ... same as earlier ULAs. The memory paging etc. is handled off ...
    mcleod_ideafix mcleod_ideafix September 2012 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... be possible with the internal memory of the FPGA.[/QUOTE]
    contention periods - and therefore avoid the ... a test that simulates ZX contention, then go and test the ... DVI out buffer is the memory that will be actually scanned ...
    Winston Winston September 2012 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... signal which goes away during contention periods - and therefore avoid the ... a test that simulates ZX contention, then go and test the ... DVI out buffer is the memory that will be actually scanned ...
    BiNMaN BiNMaN September 2012 Hardware
  • Coding for 128kHi all, I wonder if anyone can suggest any useful reading/threads/examples on the fundamentals of 128k coding. Chapter 24 of the +2 manual has prov…

    ... the 4 x 16k uncontended memory banks from 0-65535.
    memory in bank 7 is a ... start to generate screen so contention does not occur
    -if ...
    catmeows catmeows October 2012 Development
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... to count T-states pre-contention, and therefore know exactly where ... FPGA is or how much memory the Spectra has - but to ...
    Winston Winston October 2012 Sinclair Miscellaneous
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... to count T-states pre-contention, and therefore know exactly where ... FPGA is or how much memory the Spectra has - but to ...
    BloodBaz BloodBaz October 2012 Sinclair Miscellaneous
  • Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …

    ... see it, with fast enough memory you can simply read whatever ... memory like that, they could have done the same thing without contention ... ULA uses to address the memory. They would even actually save ... dedicated to dealing with the contention...

    Patrik
    Patrik Rak Patrik Rak October 2012 Hardware
  • Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …

    ... memory like that, they could have done the same thing without contention ... dedicated to dealing with the contention..[/QUOTE]
    The speccy ... some sort of buffered memory manager that interlaces video ... far more silicon than the contention handler of the ULA, ...
    csmith csmith October 2012 Hardware
  • Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …

    ... rate) and it still has contention ;-)

    Logic is going ... lot more complicated if compressing memory fetches.
    csmith csmith October 2012 Hardware
  • Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …

    ... much more, compatibility with ZX48 contention could be implemented the same ... have different timings, so removing contention would not change a lot ... would change for more fast memory.
    kpuchatek kpuchatek October 2012 Hardware
  • Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …

    ... , then you could steal the memory cycle during the Z80 refresh ... memory access (you would of course ... at "full speed" with no contention.

    [I][B]Mark ...
    1024MAK 1024MAK October 2012 Hardware
  • Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …

    ... , but you need latches and memory access time faster then Z80 ... the only reason for having contention was lack of ULA space ... /> I never heard of 'Transparent' memory access for Z80.
    kpuchatek kpuchatek October 2012 Hardware
  • Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …

    ... the only reason for having contention was lack of ULA space ... . the price tag for the memory available.

    [QUOTE]" ... I never heard of 'Transparent' memory access for Z80.[/QUOTE]
    memory as if each was the ...
    Patrik Rak Patrik Rak October 2012 Hardware
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... onto one of its 16K memory banks. It does this my ... listening to "memory writes" to the spectrum video ... the contents of the SPECTRA memory back to the spectrum.
    contention and output rasterisation exactly.
    BloodBaz BloodBaz January 2013 Sinclair Miscellaneous
  • Correction of +2 hardware errorsThis is a collection of various pieces of information picked up from various places, including a lot from this forum. I have edited it and reworded i…

    ... ). This is port decoder and memory controller.

    List of ... cpu with same way as memory access)

    Is possible ... with original I/O space contention:
    [url]http://velesoft.speccy ...
    velesoft velesoft January 2013 Hardware
  • TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…

    ... /> [LIST]
    [*] The contention pattern.
    [*] Whether spurious contention is applied as ... per the Sinclair machines when neither memory ... . not considering MREQ when applying contention).
    [*] Whether all ports in ...
    zub zub January 2013 Hardware
  • TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…

    ... /> [LIST]
    [*] The contention pattern.
    [*] Whether spurious contention is applied as ... per the Sinclair machines when neither memory ... . not considering MREQ when applying contention).
    [*] Whether all ports in ...
    TK90XFan TK90XFan January 2013 Hardware
  • Timing in loading routinesJust for curiosity I have done some experiments with SAVE command in accurate emulators, and then analyzing the generated WAV and I have obtained lit…

    ... putting the loader in screen memory. I soon figured out that ... because this memory is contended, it was fairly ... accordingly to cope with the contention?
    jamorski jamorski February 2013 Development
  • Timing in loading routinesJust for curiosity I have done some experiments with SAVE command in accurate emulators, and then analyzing the generated WAV and I have obtained lit…

    ... out that because this memory is contended, it was ... accordingly to cope with the contention?[/QUOTE]

    ... standard routine to work in contention memory. Exactly in a +2A ... ; modified value to work with contention
    ELSE
    LD ...
    antoniovillena antoniovillena February 2013 Development
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... the time from the last memory access before pulling RAS down ... about to start a video memory read. During that time, ... /> - Do a preventive I/O contention based upon partial decoding. That ... (FFh).

    A preventive contention means adding some lines from ...
    mcleod_ideafix mcleod_ideafix March 2013 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... in Timex hicolour mode, the memory from 5800h to 5AFF (standard ... attribute memory) is not used. There's no contention penalty for ... of the Spectrum's screen memory ordering system?[/QUOTE]
    As ...
    mcleod_ideafix mcleod_ideafix March 2013 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... the time from the last memory access before pulling RAS down ... about to start a video memory read. During that time, the ... /> - Do a preventive I/O contention based upon partial decoding. That ... ports. [I](* Or very little contention.)[/I]

    One ...
    Mr X Mr X March 2013 Hardware
  • BIFROST* for graphic artists - part 1Using multicolor requires 2 very different skills: [I]programming[/I] and [I]graphic design[/I]. I already wrote several tutorials about the former …

    ... you like. However, changing the memory addresses around takes time, so ... screen.[/QUOTE]

    Considering contention issues, I'm guessing we ... some unused address in contented memory (for instance 23680).

    Einar Saukas Einar Saukas March 2013 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…

    ... emulates a TK90X for contended memory and contended input port *FF ... peripheral could have affected IO contention...
    Einar Saukas Einar Saukas April 2013 Emulators
  • Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…

    ... except for this one. Contention on 48k spectrum can take ... updates etc), the memory itself only produces contention when not on ... tacts per byte due to contention, and efficient blitters based ... access screen memory, you have 8 possible values of contention delay: ...
    introspec introspec June 2013 Development
  • Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…

    ... access screen memory, you have 8 possible values of contention delay: 6 ... screen memory access.[/QUOTE]

    This is not how contention works ... .

    You typically hit contention more than once for each ...
    Einar Saukas Einar Saukas June 2013 Development
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