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  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... also had to remove the floating bus sync, but that’s irrelevant ...
    Ast_A_Moore Ast_A_Moore February 2018 Development
  • Fuse for macOS 1.5.1 ReleasedA new version of Fuse for macOS has been released at the dedicated sourceforge project: https://sourceforge.net/projects/fuse-for-macosx/ Note …

    ... the proper operation of the floating bus emulation and add it to ...
    Ast_A_Moore Ast_A_Moore March 2018 Emulators
  • I introduce myself and my emulator.Hi! My name is Marta, and I've been a Speccy user for 30+ years now. During the past year I decided to write my own emulator, just to see if I cou…

    ... haven't implemented yet the floating bus values from contended memory reads ...
    TheMartian TheMartian March 2018 Emulators
  • Vega Spectrum KeymapsHi everybody, I am new on here, so apologise if this is int the wrong category. I have searched the forums and can find some keymaps for the vega …

    ... Vega doesn’t emulate the floating bus on the Spectrum, so my ...
    Ast_A_Moore Ast_A_Moore June 2018 Emulators
  • Vega Spectrum KeymapsHi everybody, I am new on here, so apologise if this is int the wrong category. I have searched the forums and can find some keymaps for the vega …

    I'm surprised Chris didn't do the floating bus. I will dig my Vega out later and test a few of the games (unless someone else did this for you already).
    colonel32 colonel32 June 2018 Emulators
  • Vega Spectrum KeymapsHi everybody, I am new on here, so apologise if this is int the wrong category. I have searched the forums and can find some keymaps for the vega …

    [quote="colonel32;941959"]I'm surprised Chris didn't do the floating bus.[/quote]
    I know. Yet, it seems to be the case.
    [quote="colonel32;941959"]I will dig my Vega out later and test a few of the games.[/quote]
    That’d be great, Rob!
    Ast_A_Moore Ast_A_Moore June 2018 Emulators
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... ]
    If you mean the floating bus trick, then no. [i]Sidewize ...
    Ast_A_Moore Ast_A_Moore July 2018 Games
  • Which to buy? +2/+2a/+3?Sorry - I did a quick bit of lunchtime googling, it sounds like the grey +2 is the best machine, as it has the board without the reduced chipset. I …

    Floating BUS ~X(
    guesser guesser September 2018 Hardware
  • Which to buy? +2/+2a/+3?Sorry - I did a quick bit of lunchtime googling, it sounds like the grey +2 is the best machine, as it has the board without the reduced chipset. I …

    [quote="guesser;946233"]Floating BUS ~X( [/quote]
    Oops, sorry! :\">

    Fixed neatly leaving my mistook (yes I know) on display. :)
    spider spider September 2018 Hardware
  • Which to buy? +2/+2a/+3?Sorry - I did a quick bit of lunchtime googling, it sounds like the grey +2 is the best machine, as it has the board without the reduced chipset. I …

    If you want hardware for testing your software then the floating bus issue is irrelevant. The solution is don't abuse the floating bus in your code.
    guesser guesser September 2018 Hardware
  • Which to buy? +2/+2a/+3?Sorry - I did a quick bit of lunchtime googling, it sounds like the grey +2 is the best machine, as it has the board without the reduced chipset. I …

    [quote="guesser;946236"]If you want hardware for testing your software then the floating bus issue is irrelevant.[/quote]

    More to the point, it you want hardware for testing your software, [i]don’t mod it[/i].
    Ast_A_Moore Ast_A_Moore September 2018 Hardware
  • [Asm] Is this nested loop faster than LDIR or a bunch of unrolled LDI's?Hi all. I'm learning Z80 asm on Speccy 48K, and to start with I decided to write my own "CLS" routine (without relying on ROM calls or LDIR) as a lea…

    ... OT but I read your floating bus guide, it was fascinating. Made ...
    ST1 ST1 November 2018 Development
  • [Asm] Is this nested loop faster than LDIR or a bunch of unrolled LDI's?Hi all. I'm learning Z80 asm on Speccy 48K, and to start with I decided to write my own "CLS" routine (without relying on ROM calls or LDIR) as a lea…

    ... ="ST1;947822"]I read your floating bus guide, it was fascinating. Made ...
    Ast_A_Moore Ast_A_Moore November 2018 Development
  • Paging WoodyI have been trying to contact [url="https://www.worldofspectrum.org/forums/profile/341/Woody"]Woody[/url], regarding an old Manic Miner project of hi…

    Hi @Crisis ,

    If you need more information about the floating bus, check out the links in my signature.
    Ast_A_Moore Ast_A_Moore December 2018 Announcements
  • A Yankee in IraqI'm testing the game on the zx next and it currently hangs right after the game starts no matter what timing regimen and contention pattern is chosen…

    ... Fuse and it ran successfully (floating bus port issue with IF1 active ...
    dbolli dbolli February 2019 Development
  • Raster effects - quick questionHi Guys Just a quick question regards what the ULA is doing as its drawing each scan line. Assuming the beam has finished drawing the border, am I…

    ... ! Thanks joefish!

    That floating bus is an interesting read. Think ...
    Dax Trajero Dax Trajero August 2019 Development
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... fix[/url] that removes the floating bus dependence altogether. Both of these ...
    Alessandro Grussu Alessandro Grussu August 2019 Games
  • ZX Spectrum rescued from a friend, has Issues.Hi guys, I've recovered this ZX spectrum 48K from a friend. It's a 1984 ISSUE 6A. He told me the last time it was turned on was about 30 years ago!.…

    ... how it would affect the floating bus, since the data lines are ... it might not exhibit the floating bus effect by design, but then ... the values on the bus when it’s floating. Or, it exhibits ...
    Ast_A_Moore Ast_A_Moore September 2019 Hardware
  • ZX Spectrum rescued from a friend, has Issues.Hi guys, I've recovered this ZX spectrum 48K from a friend. It's a 1984 ISSUE 6A. He told me the last time it was turned on was about 30 years ago!.…

    ... ... it definitely does have the floating bus effect.
    The results should ... should be setting the data bus lines to a voltage (logic ... CPU then sees the data bus value as 255.

    bus, I would expect a value ...
    1024MAK 1024MAK September 2019 Hardware
  • ZX Spectrum rescued from a friend, has Issues.Hi guys, I've recovered this ZX spectrum 48K from a friend. It's a 1984 ISSUE 6A. He told me the last time it was turned on was about 30 years ago!.…

    ... how it would affect the floating bus, since the data lines are ... it might not exhibit the floating bus effect by design, but then ... the values on the bus when it’s floating. Or, it exhibits ...
    TigerZX TigerZX September 2019 Hardware
  • ZX Spectrum rescued from a friend, has Issues.Hi guys, I've recovered this ZX spectrum 48K from a friend. It's a 1984 ISSUE 6A. He told me the last time it was turned on was about 30 years ago!.…

    ... it does pick up the floating bus values, just not as often ...
    Ast_A_Moore Ast_A_Moore September 2019 Hardware
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... it really appear on the bus. Can you share?

    floating bus is incorrect - it's not ... get hold of the original floating bus test program which was used ...
    Patrik Rak Patrik Rak November 2019 Development
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... . I think it's stock floating bus test just modified to use ...
    Ast_A_Moore Ast_A_Moore November 2019 Development
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... . I think it's stock floating bus test just modified to use ...
    Hikaru Hikaru November 2019 Development
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... 's the results from recent floating bus test 2, there were 2 ...
    Your Spec-chum Your Spec-chum November 2019 Development
  • How can i edit or delete my postHi I want to edit or delete comments or new discussion on other categories that i made, but i don´t know how to do it I don´t find any button …

    ... to resources (images, etc.). Our floating bus thread was recently affected by ...
    Ast_A_Moore Ast_A_Moore December 2019 WoS/Forum Issues
  • How can i edit or delete my postHi I want to edit or delete comments or new discussion on other categories that i made, but i don´t know how to do it I don´t find any button …

    ... to resources (images, etc.). Our floating bus thread was recently affected by ...
    hikoki hikoki December 2019 WoS/Forum Issues
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