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<1…20212223242526…34>
  • 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…

    ... HALT you can reduce the contention.[/QUOTE]
    Or to save ...
    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…

    ... :1, de:1" ie apply contention based on the value of ... , run for 1 tstate, apply contention for the value of DE ...
    Philip Kendall Philip Kendall 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…

    ... :1, de:1" ie apply contention based on the value of ... , run for 1 tstate, apply contention for the value of DE ... be just one point of contention with (DE), and therefore that ...
    ajmoss ajmoss June 2010 Development
  • World Cup Online?I really want to watch the world cup live. Being in the US the proper way to do that would be to get cable TV and a sports channel. I would do that…

    ... /2 weeks.

    My contention is that they are not ...
    ADJB ADJB July 2010 Chit chat
  • World Cup Online?I really want to watch the world cup live. Being in the US the proper way to do that would be to get cable TV and a sports channel. I would do that…

    [QUOTE=ADJB;455110]My contention is that they are not ...
    psj3809 psj3809 July 2010 Chit chat
  • Beepola v1.01A new version of Beepoa, v1.01, is now available for download from:- [URL]http://freestuff.grok.co.uk/beepola/Beepola_v1.01.00.zip[/URL] (650KiB) …

    ... (without arpeggio) for 16K, because contention pattern is rather complex to ... 16K - the ROM has no contention.
    Shiru Shiru July 2010 Announcements
  • X128 - moved forward.I don't know if anybody noticed but author of the X128 emulator resumed works on the program: [url]http://www.indigobanquet.adsl24.co.uk/x128wip/x12…

    ... based machines without adress space contention. It's problem on ZX ...
    velesoft velesoft July 2010 Emulators
  • X128 - moved forward.I don't know if anybody noticed but author of the X128 emulator resumed works on the program: [url]http://www.indigobanquet.adsl24.co.uk/x128wip/x12…

    ... based machines without adress space contention. It's problem on ZX ...
    Mister Beep Mister Beep July 2010 Emulators
  • 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…

    ... />
    As regards the memory contention, this is very true and ...
    kphair kphair July 2010 Sinclair Miscellaneous
  • RGB to VGA convertor for ZX128/+2/+2A/+3David Luftner release source code (VHDL) of SCANDOUBLER for ZX128/ZX128+2/+2A/+3: [url]http://velesoft.speccy.cz/other/scandoubler-for-zx128_fixed_by…

    ... CPU clock while in ULA contention. (Actually for a double buffered ...
    Winston Winston July 2010 Hardware
  • Knight Lore on c64.. after 25 years..It seems that Knight Lore coming on commode a quarter century after speccy version. ;) Well, better late than never.. The game is still in developmen…

    ... 4mhz bus, so no DMA contention) on a machine with a ...
    PeteD PeteD July 2010 Chit chat
  • Knight Lore on c64.. after 25 years..It seems that Knight Lore coming on commode a quarter century after speccy version. ;) Well, better late than never.. The game is still in developmen…

    ... 4mhz bus, so no DMA contention) on a machine with a ...
    ewgf ewgf July 2010 Chit chat
  • 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…

    ... , 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…

    ... +2 have the wrong RAM contention (i.e. not what the ...
    chev chev August 2010 Hardware
  • 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…

    ... you have to consider the contention differences between the early 128s ...
    chev chev August 2010 Hardware
  • Using the stack to copy memory blocksA [b]PUSH[/b] and a [b]POP[/b] instruction together take less time than two [b]LDI[/b], so long [b]POP/PUSH[/b] sequences are sometimes used to copy …

    ... largely comes down to memory contention. LDI has DE on the ...
    Matt_B Matt_B August 2010 Development
  • Using the stack to copy memory blocksA [b]PUSH[/b] and a [b]POP[/b] instruction together take less time than two [b]LDI[/b], so long [b]POP/PUSH[/b] sequences are sometimes used to copy …

    ... to synch themselves around the contention. This let me put a ...
    joefish joefish August 2010 Development
  • Mr Do! ?Not exactly a new idea (at least twenty-seven years old now :-o), but how about a port of Mr Do! to the Spectrum? There was never an official one, ev…

    ... address 32768, because the RAM contention messes them up.

    contention pattern on a 16K / 48K ... 't affected by I-register contention, so it can use interrupt ...
    ajmoss ajmoss August 2010 New game ideas
  • Mr Do! ?Not exactly a new idea (at least twenty-seven years old now :-o), but how about a port of Mr Do! to the Spectrum? There was never an official one, ev…

    ... address 32768, because the RAM contention messes them up.

    contention pattern on a 16K / 48K ... 't affected by I-register contention, so it can use interrupt ...
    ewgf ewgf August 2010 New game ideas
  • sid tune remix on spectrum?I wonder if there is any way to convert c64 sid tune to spectrum? I like Matt Gray's c64 Driller theme and would love to have on speccy. Something li…

    ... limited frame time (and reduced contention).

    [QUOTE]And before ...
    obo obo August 2010 Development
  • Ufo?I was just having a cigarette outside just a few minutes ago and saw something very 'odd' in the sky. It looked like a very bright orange star, yet …

    ... 't become a 'bone of contention' until the mid 90s. even ...
    def chris def chris August 2010 Chit chat
  • Broken ZX Spectrum? :(Hi! I bought a 2nd hand ZX Spectrum half a year ago. It worked perfectly fine when I first tried it. I put it back in its box which it was sent in, …

    You should remove the white material (electrolyt material) that came out of that electrolytic capacitor because ir may cause a short at the PCB and it is also aggressive for the copper lines.

    Greets Ingo.
    ingo ingo August 2010 Hardware
  • Why was/is the ZX Spectrum so popular?Why? How? Even after all this time you have a website like this etc.... It's just amazing!

    ... thanks to not having memory contention either, the BBC is a ...
    Winston Winston August 2010 Games
  • Developing ZX Spectrum using 8 chipsHello. Sorry, my english is not perfect. I am developing new realising of ZX Spectrum. There are 8 chips in my sch. Central processor and video proce…

    ... to 100% emulation, so no contention, multicolors, etc - not actually ZX ...
    Shiru Shiru September 2010 Hardware
  • Playstation MoveAny other PS3 owners getting/got one? Mine arrived a day early so I had a good go with it last night with Resi 5 Gold. Seems really accurate, far m…

    ... at all - it's two IR light sources a fixed distance ...
    joefish joefish September 2010 Chit chat
  • Help with loaderHelp! I have been racking my brains for too long, and so it?s time to ask for help. Kyd Cadet II is about 98% complete now and I am trying to put to…

    ... be screwed due to memory contention. How big is AGD's ...
    Metalbrain Metalbrain October 2010 Development
  • Do ULAs die?Thought I'd start this thread as people often think their ULA is dead, when it's actually the RAM or power circuits. Searching the forum in the futur…

    Old ULAs never die - they just increase contention.
    Dunny Dunny October 2010 Hardware
  • Do ULAs die?Thought I'd start this thread as people often think their ULA is dead, when it's actually the RAM or power circuits. Searching the forum in the futur…

    ... never die - they just increase contention.[/QUOTE]

    ... :-)

    If contention did increase, then either the ... go two ways: increased contention or decreased contention.

    ... would be affected, altering contention. Again it could go ...
    csmith csmith October 2010 Hardware
  • DMA interface for ZX Spectrum[url]http://velesoft.speccy.cz/data-gear.htm[/url] This is internal DATA-GEAR interface for any 8-bit computer with Z80CPU. Use Direct Memory Access…

    ... certainly no video ula ram contention to contend with mind you ...
    Roger Jowett Roger Jowett October 2010 Hardware
  • ZX Spectrum+ Problem - Need help -Greetings guys, I bought one ZX Spectrum+. This is what displays on the TV: [IMG]http://d.imagehost.org/0371/17102010_001.jpg[/IMG] When I switch …

    ... friend of mine has a IR thermometer and I will give ...
    covenant covenant October 2010 Hardware
<1…20212223242526…34>

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HitBox

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ir 234 292
contention 1.4K 2.4K

Related Threads

  • Z80 cycle contentionHi,<br /> Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle?<br /> I mean which Z80 clock cycle, T1 or T2?<br /> …
  • Memory Map/ContentionHi <br /> I'm new to speccy coding (well I did some z80 coding a few years back - like 20yrs ago :) ), and I'd like to get back into writing some scr…
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  • Contention: LDI vs LD (ss), rAccording c.s.s. FAQ:<br /> <br /> instruction LD (ss),r breakdowns as pc:4,[b]ss:3[/b]<br /> and LDI as pc:4,pc+1:4,hl:3,[b]de:3,de:1 x 2[/b]<br /> …
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  • BIT b,(ii+n) contentionThe documentation says that BIT b,(ii+n) has this contention pattern:<br /> <br /> pc+1:4,pc+2:3,pc+3:3,pc+3:1 x 2,ii+n:3,ii+n:1<br /> <br /> See [ur…

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