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  • Can you write in the border?Is it at all technically possible in any way to get stuff into the border, apart from changing the border colour? I believe the C64 used the border a…

    ... the border port (removing display contention for extra speed). If the ...
    obo obo November 2007 Sinclair Basic
  • ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…

    ... with refresh, but is a contention side-effect and is not ... fact, it switches off any contention at the rising edge of ... between 0x4000 and 0x7FFF the contention will not be noticed as ... ULA will be in its 'contention off mode', but it will ...
    csmith csmith November 2007 Development
  • Spin 0.666 Little Bug using 48K Keyboard helperHello, There is a little bug in the 48K Keyboard Helper. If you try to write an inverted commas ("), LOAD "", for example, if you press the p key a…

    [QUOTE=Philip Kendall;224783]I believe Marko accidently disabled contention :-)[/QUOTE]

    WRONG! Marko disabled contention quite deliberately during a test - unfortunately, he forgot to turn it back on again :p

    Marko
    Marko Marko November 2007 Emulators
  • Spin 0.666 Little Bug using 48K Keyboard helperHello, There is a little bug in the 48K Keyboard Helper. If you try to write an inverted commas ("), LOAD "", for example, if you press the p key a…

    [quote=Marko;225080]WRONG! Marko disabled contention quite deliberately during a test - unfortunately, he forgot to turn it back on again :p

    Marko[/quote]
    You do get quite absent-minded when you get to Marko's advanced age...
    rich_chandler rich_chandler November 2007 Emulators
  • Quick test (2)Could I ask any 128 / +2 / +2A / +3 owners to test the new version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]fusetest[/url] on thei…

    ... (0x01)
    HP contention 1...passed
    HP contention 2...failed (0xff ...
    Jose_Leandro Jose_Leandro November 2007 Hardware
  • Quick test (2)Could I ask any 128 / +2 / +2A / +3 owners to test the new version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]fusetest[/url] on thei…

    ... dramatically at the 'High port contention 2' test. I assume this ...
    gasman gasman November 2007 Hardware
  • Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…

    ... the bytes without any memory contention would be nice, too.[/QUOTE ...
    zub zub November 2007 Emulators
  • New tape releases - 128K only?As Jon's new Egg-Head game is 128K only, and splATTR has also evolved into a 128K only game - both due to memory constraints - I was wondering if the…

    ... be the case, but the contention on the RAM pages will ...
    icabod icabod December 2007 Games
  • Benchmark timeWell, the BASIC benchmark posted in Creative Computing back in the 80s came up as a topic on the AtariAge forums. The article is available online an…

    ... measure the impact of buss contention introduced by using hi-res ... also suffer from some bus contention caused by video refresh that ...
    JamesD JamesD December 2007 Sinclair Basic
  • Benchmark timeWell, the BASIC benchmark posted in Creative Computing back in the 80s came up as a topic on the AtariAge forums. The article is available online an…

    ... also suffer from some bus contention caused by video refresh that ... on performance. The CPC's contention model has more impact -- the ...
    Alcoholics Anonymous Alcoholics Anonymous December 2007 Sinclair Basic
  • Compressors are available for Speccys ?Hi folks, although I was an wasn't strictly a speccy coder in the glory days (amstrad & amiga for the most part), I have secides to arse about with …

    ... : ld ixl,128
    apbranch1: ldi
    aploop2: ld ixh,1 ... : ld ixl,128
    apbranch1: ldi
    aploop0: ld ixh,1 ...
    Metalbrain Metalbrain December 2007 Development
  • New Spectrum game - Isotopia by OctocomOctocom, the guys who made BASIC programmed games such as Pandemia or Insert Coins, released yesterday their very first compiled BASIC game: Isotopia…

    ... are the memory-paging & contention timing differences, but I'm ...
    bobs bobs December 2007 Games
  • Virgin Media SuckThey how charge 25p per min + 10p connection chage to for customer service?? All their previous systems for contacting them have now been recinded. …

    ... they've done away with contention that annoyed me too.
    dekh dekh December 2007 Chit chat
  • New tape releases - 128K only?As Jon's new Egg-Head game is 128K only, and splATTR has also evolved into a 128K only game - both due to memory constraints - I was wondering if the…

    ... be the case, but the contention on the RAM pages will ...
    Tom-Cat Tom-Cat December 2007 Games
  • New Spectrum game - Isotopia by OctocomOctocom, the guys who made BASIC programmed games such as Pandemia or Insert Coins, released yesterday their very first compiled BASIC game: Isotopia…

    ... are the memory-paging & contention timing differences, but I'm ...
    na_th_an na_th_an December 2007 Games
  • Full throttle CPUHello, I was just wondering: do you experts know if any of the 48K games pushes the Z80 CPU to 100%? I mean, every CPU cycle is used? If so, what's t…

    ... just as quick (modulo memory contention) as any other write on ...
    Philip Kendall Philip Kendall January 2008 Sinclair Miscellaneous
  • another c64 vs. Speccy site...[url]http://c64vsspectrum.com/[/url] 25 years and we are still brawling.. ;)

    ... first place.

    Then contention would also be an absolute ... like this but also eliminate contention altogether.
    Winston Winston January 2008 Games
  • another c64 vs. Speccy site...[url]http://c64vsspectrum.com/[/url] 25 years and we are still brawling.. ;)

    ... ). Even more, you can use ldi-ldi-ldi sequences alot easier when copying ...
    TVzombie TVzombie January 2008 Games
  • A suggestion about new gamesI'm talking about "[I]Brand New Games[/I]" ([I]Isotopia, Daytona USA, Space Rocks[/I]...) Don't you think they must be in a separate part in the arc…

    ... 's time reading. So my contention was pragmatic, rather than trying ...
    Danforth Danforth January 2008 Games
  • Fuse for Mac OS X beta releasesA beta version of Fuse for Mac OS X has been released at the dedicated sourceforge project: [url]http://sourceforge.net/projects/fuse-for-macosx/[/u…

    ... emulation (Q-Master).
    [*] Fix contention for LD?R, CP?R ... (Stuart Brady).
    [*] Separate out contention when MREQ isn't active ... the +2A/+3 ULA applies contention only when MREQ is active ...
    Fred Fred February 2008 Emulators
  • help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…

    ... you can do is use ldi, the unrolled version of ldir ... /> push hl
    ldi x 32 ; repeat ldi 32 times to copy ... we could hope for using ldi (16 cycles per byte).
    Alcoholics Anonymous Alcoholics Anonymous February 2008 Development
  • help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…

    ... you can do is use ldi, the unrolled version of ldir ... we could hope for using ldi (16 cycles per byte).
    bigjon bigjon February 2008 Development
  • help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…

    ... pe do?[/QUOTE]

    LDI decrements BC and sets the ... not much better than the ldi method and a far cry ...
    Alcoholics Anonymous Alcoholics Anonymous February 2008 Development
  • help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…

    ... speed at runtime but the ldi method allows selecting scrolls by ... cycles to play with. The ldi method already has you at ...
    Alcoholics Anonymous Alcoholics Anonymous February 2008 Development
  • problem using FRAMES to generate 'random' numbersI realise the pros use bytes from ROM to get their random numbers, presumably because they want to use FRAMES to synchronise the printing and avoid s…

    ... (using Alcoholics Anonymous's 32x ldi pixel-scrolling method) to go ...
    Dr BEEP Dr BEEP March 2008 Development
  • DivIDE+ and 128K HeatsinkI got my DivIDE+ yesterday and i tried it on a 48K+ at first, it worked marvelously on it, no problems at all. Today i desided to try it on my 128 H…

    ... clones don't have memory contention, so the programmers weren't ...
    gasman gasman March 2008 Hardware
  • Emulator accuracy test?When I first created my emulator it worked fine. But then I found one or two games that had odd quirks. Eventually I found the flag or command that w…

    ... , flag, memory location (and maybe contention and timing too, if possible ...
    ewgf ewgf March 2008 Emulators
  • Emulator accuracy test?When I first created my emulator it worked fine. But then I found one or two games that had odd quirks. Eventually I found the flag or command that w…

    ... , flag, memory location (and maybe contention and timing too, if possible ...
    Robocop48k Robocop48k March 2008 Emulators
  • Memory paging in 128 KB - 64KB RAM possible?I have found a quote in Spectrum 3 manual (available at WOS) -------------------- In the +3, we have crammed in more than twice the amount of memory…

    ... any configuration which reflects the contention of the "normal" RAM paging ...
    mjwilson mjwilson March 2008 Development
  • First multiload gameWhile writing the review of A View to a Kill for the Speccy review book, I commented that it was one of the first multi-load games for the Speccy. D…

    ... .

    Damn you memory contention delays! Damn you all to ...
    SnakeOilSteve SnakeOilSteve March 2008 Games
<1…15161718192021…34>

Latest Posts

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