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  • 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
  • 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…

    ... perfect as far as the floating bus was concerned.) :D

    Ast_A_Moore Ast_A_Moore March 2018 Emulators
  • Send in the ClonesPlease name all the Spectrum clones out there ( I would say I need it back on my desk in 5 minutes , but I will be a bit more generous in this case!…

    ... did in fact have the floating bus all along[/quote]
    Actually ... +2A & +3 had a floating bus...

    https://www.sinclairzxworld ...
    rich_chandler rich_chandler March 2018 Hardware
  • 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…

    ... wish I’d discovered the floating bus on the +2A/+3 back ...
    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…

    ... wish I’d discovered the floating bus on the +2A/+3 back ...
    rich_chandler rich_chandler 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
  • Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…

    ... during my investigation of the floating bus, I determined that the +2A ...
    Ast_A_Moore Ast_A_Moore July 2018 Assembler
  • 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 …

    ... to fix the [s]floating point[/s] "floating bus" issue, but I do ...
    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 …

    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
  • Limitations of emulationsYears ago at a trade fair, I got chatting to the guys who programmed [i]Gyron[/i]. They were demonstrating it and showed me an undocumented feature: …

    ... discovery and description of the floating bus on the Spectrum +2A/+3 ...
    Ast_A_Moore Ast_A_Moore January 2019 Games
  • Limitations of emulationsYears ago at a trade fair, I got chatting to the guys who programmed [i]Gyron[/i]. They were demonstrating it and showed me an undocumented feature: …

    ... discovery and description of the floating bus on the Spectrum +2A/+3 ...
    rich_chandler rich_chandler January 2019 Games
  • GLUF[url="http://www.retrosouls.net/"]retrosouls.net/[/url] https://youtu.be/P4F4XVbnNDY

    ... don't know about "#ff floating bus" on grey +2. That how ...
    DenisGrachev DenisGrachev January 2019 Brand new software
  • 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
  • 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…

    ... a loop reading the +3 floating bus through port 0x0ffd. I don ... 128k mode now with the floating bus reading through 0x40ff. This should ...
    Alcoholics Anonymous Alcoholics Anonymous February 2019 Development
  • 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…

    ... right, the game uses the floating bus for frame syncing. To cover ... port to read (and the bus polling loop itself).

    [/code]

    The floating bus loop itself looks like this ...
    Ast_A_Moore Ast_A_Moore February 2019 Development
  • 50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…

    ... I am waiting until the Floating Bus hits 2/3 of the ...
    robpearmain robpearmain June 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 ...
    Hikaru Hikaru August 2019 Games
  • 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!.…

    ... ’s games that uses the floating bus for syncing. Try the original ... ) of games that use the floating bus:

    [i]Cobra[/i ... Fu[/i] also uses the floating bus. It even has a special ...
    Ast_A_Moore Ast_A_Moore September 2019 Hardware
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