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<1…20212223242526…34>
  • IM2 Loading on +3EHi there Speccy Guru's, As some of you know, I've spent a while building the ultimate image for +3e, it's currently at 6000+games and demos and i've…

    ... done on a machine with contended screen memory (it requires too ...
    Tom-Cat Tom-Cat April 2010 Development
  • 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…

    ... Data
    0xOFFSET2+1 - 0xOFFSET3 : Contended Memory
    0xOFFSET3+1 - 0xFINAL ...
    micpringle micpringle April 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…

    ... + attribute) which is also the contended memory.
    32768 to 65535 ...
    Arjun Arjun April 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…

    ... . Quite right. I inadvertently clubbed contended memory with the display memory ...
    Arjun Arjun April 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…

    ... -0x3FFF ROM
    0x4000-0x7FFF (Contended) User RAM
    0x8000-0xFFFF ... RAM

    Within the contended user RAM:

    0x4000 ... certain times. This is the 'contended memory'.

    The remaining ...
    joefish joefish April 2010 Emulators
  • 48k Timing Tests...Here's v1 of the timing tests for the 48k Spectrum, with a little background [IMG]http://www.zxspectrum4.net/images/timing_test_v1.jpg[/IMG] [URL="…

    ... failed two tests (12 contended and 27 contended). It had warmed only ...
    Metalbrain Metalbrain April 2010 Development
  • Retro Gaming Love or Profiteering - A DiscussionI'm having a debate on a forum for a popular MAME (arcade emulator) front end (Hyperspin). I'm questioning the ethics of a site called EmuMovies.co…

    ... 16MBps home connection (which is contended and has only 800Kbits or ...
    Winston Winston April 2010 Chit chat
  • Changing the look of the 48K editor cursor?I've read many books and mags since 1987 but never saw it done, and a wos forum search revealed nothing. If I wanted to customize the cursor and, let…

    ... cursors, select flashing bright
    NOP ; white on blue.
    [/code ...
    John Elliott John Elliott April 2010 Sinclair Miscellaneous
  • 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…

    ... .
    Pages 4-7 are contended in that the Z80 and ...
    ajmoss ajmoss April 2010 Hardware
  • 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…

    ... say the same banks are contended so how can that be ...
    Woody Woody April 2010 Hardware
  • 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…

    ... .

    If (HL) is contended, two passes of the loop ... to 50 T for non-contended RAM.

    A fairly ...
    ajmoss ajmoss April 2010 Hardware
  • 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…

    Hardware is the answer... or not ?

    From: [url]www.fruitcake.plus.com[/url]
    The RAM banks 4, 5, 6 and 7 (the contended RAM) are formed from IC6 - IC13, whereas the RAM banks 0, 1, 2 and 3 (the uncontended RAM) are formed from IC15 - IC22.
    kpuchatek kpuchatek April 2010 Hardware
  • CPU speed measure possible?Is it possible to measure the CPU speed and shows the result on a LED display? Micky

    ... direct from Xtal, the other ('contended') one from ULA. We don ...
    roko roko May 2010 Hardware
  • Jet Set Willy with 2 channel in-game musicI've hacked a copy of JSW to play a 2 channel beeper tune during the game -- Tequila by The Champs (it seemed appropriate to the JSW storyline). [U…

    ... in the JSW memory map), NOP out the normal music routine ...
    ccowley ccowley May 2010 Games
  • DivIDEo - streaming video on the DivIDEThis has been a bit of a personal holy grail for years and years, so I'm very pleased to announce the release of DivIDEo, my streaming video system f…

    ... something to do with avoiding contended port reads during INI instructions ...
    gasman gasman May 2010 Announcements
  • Who can fix my Flash programmer code?I have a problem with some code, it doesn't work and I don't have any idea what it's trying to do, or failing to do! The code in question is the fla…

    seems being the operative word...

    the tape routine is running in contended ram so breaks, but for some reason it worked in spin!

    also there are bugs in the flash erase code somewhere, back to the drawing board :)
    guesser guesser May 2010 Development
  • ZXSpin 0.7 public testingOk, now that the private testing phase is over, I need to get more people testing ZXSpin 0.7 I am not terribly interested in emulation problems, bec…

    ... />

    [code]
    l_fe5c: nop ; 65116 0 4ts
    l_fe5d ... : nop ; 65117 0 4ts
    l_fe5e: nop ; 65118 0 4ts ...
    Gedlion Gedlion May 2010 Emulators
  • So you need to double (or triple, or quadruple) the clock speed...No particular reason for posting this, other than I was looking at an eZ80 evaluation board that does this, and that jogged my memory of a project I'…

    ... ULA (both VRAM and non-contended RAM), and I'm afraid ... other way, if a non-contended RAM access is to be ...
    mcleod_ideafix mcleod_ideafix June 2010 Hardware
  • Resolving USR entry point into a data + m/code block?Well, I had another look at that Merlin listing and decided that blowing up the faint page made it possible to read everything (with a struggle). How…

    ... c9 RET
    7566 00 NOP
    7567 3aff5b LD A ...
    Battle Bunny Battle Bunny June 2010 Development
  • zxs v0.2 releasedI have released v0.2 of zxs if anyone is interested, judging by the response to the first release, I'd say not, but I'm gonna do it anyway!. It has h…

    ... of the ROM contains a NOP (0) rather than a DI ...
    ccowley ccowley June 2010 Emulators
  • zxs v0.2 releasedI have released v0.2 of zxs if anyone is interested, judging by the response to the first release, I'd say not, but I'm gonna do it anyway!. It has h…

    ... of the ROM contains a NOP (0) rather than a DI ...
    alien8r33d alien8r33d June 2010 Emulators
  • +2A extended memory map & ULA bug?The [URL="http://www.worldofspectrum.org/faq/reference/128kreference.htm"]128K reference page[/URL] says: [quote]The ULA bug which causes snow when I…

    ... mode, with RAM bank 4 (contended memory) in 0x0000-0x3FFF, and ...
    velesoft velesoft June 2010 Hardware
  • Arkos TrackerHi all, I'm proud to present you my Windows-based Tracker : Arkos Tracker, for you to compose for Spectrum, CPC and MSX. It requires .NET 3.5 at lea…

    ... , a scanline can hold 64 "NOP", so you can see how ...
    Targhan Targhan June 2010 Development
  • "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…

    ... previous models, since every 8 contended states there's only one ...
    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…

    ... previous models, since every 8 contended states there's only one ...
    Philip Kendall Philip Kendall June 2010 Sinclair Miscellaneous
  • 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…

    ... LDIR opcode is running in contended memory or not;
    [*] ... Source (HL) is pointing to contended memory or not;
    [*] ... Destiantion (DE) is pointing to contended memory or not;
    [/ ... note is that contended memory is not actually contended until the ...
    BloodBaz BloodBaz June 2010 Development
  • 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…

    ... note is that contended memory is not actually contended until the ULA ...
    mcleod_ideafix mcleod_ideafix June 2010 Development
  • 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…

    ... time required per byte, including contended RAM overheads but excluding any ... external loops, is:
    [code]Contended: LDIR LDI

    Only ...
    ajmoss ajmoss June 2010 Development
  • 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…

    ... ]) describes the detailed timings of contended RAM. It gives timings for ... residing in, or reading/writing, contended RAM.[/quote]

    You ...
    Philip Kendall Philip Kendall June 2010 Development
<1…20212223242526…34>

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