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  • New Game: A Yankee in Iraq (2017). A shoot-em-up.Last year, I [url="https://www.worldofspectrum.org/forums/discussion/53207/new-game-2016-revival-a-yankee-in-iraq-1992"]resurrected my old shoot-em-u…

    ... optimizations
    —Now uses the floating bus for synchronization. [b]The first ...
    Ast_A_Moore Ast_A_Moore September 2017 Brand new software
  • Should I sell my +2A?The +2A was the last Spectrum I bought and to be honest I never gave it much use :| Unlike the 48k, 48+ and +2 grey on which I have played many ga…

    ... -a-2a-3"]solved the floating bus mystery[/url] on the +2A ...
    Ast_A_Moore Ast_A_Moore September 2017 Hardware
  • New Game: A Yankee in Iraq (2017). A shoot-em-up.Last year, I [url="https://www.worldofspectrum.org/forums/discussion/53207/new-game-2016-revival-a-yankee-in-iraq-1992"]resurrected my old shoot-em-u…

    ... , or was that only a floating bus test aid?

    Here ... ;action=defaultclick"]the +2A/+3 floating bus version of SpecEmu[/url], as ...
    colonel32 colonel32 October 2017 Brand new software
  • New Game: A Yankee in Iraq (2017). A shoot-em-up.Last year, I [url="https://www.worldofspectrum.org/forums/discussion/53207/new-game-2016-revival-a-yankee-in-iraq-1992"]resurrected my old shoot-em-u…

    ... I decided to tackle the floating bus on the +2A/3 was ... or was that only a floating bus test aid?[/quote]
    Yes ... , just a floating bus visual gimmick. That’s the ... ;action=defaultclick"]the +2A/+3 floating bus version of SpecEmu[/url], as ...
    Ast_A_Moore Ast_A_Moore October 2017 Brand new software
  • Most accurate display on emulatorWhich Windows emulator has the most accurate display. I am making a game and one of the tiles is not showing correctly on an real spectrum +2 machin…

    ... . Especially after we tackled the floating bus on the +2A/+3, SpecEmu ...
    Ast_A_Moore Ast_A_Moore October 2017 Emulators
  • Things you only found out recently2014 - First found out about the existence of the QL, by the time I was reading magazines all mentions had ceased. 2017 - Found out that Frank Sid…

    ... [i]do[/i] exhibit the floating bus quirk, and you can exploit ...
    Ast_A_Moore Ast_A_Moore October 2017 Sinclair Miscellaneous
  • Loadsa bullets on screen (silkworm)Did games like silkworm just draw everything to the screen or did they have complicated optimisations? and the types of games where sprites can occu…

    ... ). [i]Cobra[/i] uses the floating bus trick to sync to the ...
    Ast_A_Moore Ast_A_Moore October 2017 Development
  • ZX Spectrum +3 repairI have my first +3 here, and it needs repairs. Hoping someone here can help me out. When I power it on I get this screen with black and white line…

    Like I mentioned in the floating bus thread, the Spectrum is a quantum computer. Can’t be absolutely sure about anything, and if you try to take any measurements—all bets are off.
    Ast_A_Moore Ast_A_Moore November 2017 Hardware
  • Introducing SpectREMYep, yet another Spectrum emulator, this one being for Mac OS. Writing my own Spectrum emulator has been a bucket list item for a while. While I'm…

    ... /> —Add proper emulation of the floating bus on the +2A/+3, and ...
    Ast_A_Moore Ast_A_Moore November 2017 Emulators
  • Test of screen switching timings.I modified the btime.tap test by Jan Bobrowski to explore the timing of screen switching. The new test, ptime-128, produces different results on diff…

    ... solve the mystery of the floating bus on the +2A/+3, so ...
    Ast_A_Moore Ast_A_Moore November 2017 Emulators
  • Test of screen switching timings.I modified the btime.tap test by Jan Bobrowski to explore the timing of screen switching. The new test, ptime-128, produces different results on diff…

    Indeed. Tried Fuse, RVM, and SpecEmu. It’s all over the place.

    Now you can understand my puzzlement and frustration with the floating bus mystery back in September.
    Ast_A_Moore Ast_A_Moore November 2017 Emulators
  • Test of screen switching timings.I modified the btime.tap test by Jan Bobrowski to explore the timing of screen switching. The new test, ptime-128, produces different results on diff…

    ... puzzlement and frustration with the floating bus mystery back in September.[/quote ... found a video about the floating bus: http://zx-pk.ru/threads ...
    weiv weiv November 2017 Emulators
  • Detecting +3 / +2AWhat's a simple but reliable way to detect if code is running on a +2A/+3? My first though was to try switching to ROM2 and then checking for the …

    [code]
    ld a,(2899) ;+2A/+3 ROMs return 126
    cp 126
    jr z,its_a_plus
    [/code]

    That’s how I did it in [i]A Yankee in Iraq[/i] to handle the floating bus sync differently on these machines.
    Ast_A_Moore Ast_A_Moore December 2017 Development
  • Detecting +3 / +2AWhat's a simple but reliable way to detect if code is running on a +2A/+3? My first though was to try switching to ROM2 and then checking for the …

    ... from contended RAM on the bus
    ld a,$0f
    floating bus behaves on the +2A/+3 ...
    Ast_A_Moore Ast_A_Moore December 2017 Development
  • MAME in spectrum emulationHey to all Does anyone use MAME as a emulator port for any Speccy HW? I was so far away from MAME developments I forgot they merged with MESS whic…

    ... the desire to implement the floating bus behavior on the +2A/+3 ... ? The ULA snow effect? The floating bus? Accurate sound? Timings? Otherwise, why ...
    Ast_A_Moore Ast_A_Moore December 2017 Chit chat
  • MAME in spectrum emulationHey to all Does anyone use MAME as a emulator port for any Speccy HW? I was so far away from MAME developments I forgot they merged with MESS whic…

    ... the desire to implement the floating bus behavior on the +2A/+3 ... ? The ULA snow effect? The floating bus? Accurate sound? Timings? Otherwise, why ...
    moggy moggy December 2017 Chit chat
  • Modern Spectrum Games Advent CalendarSo... it is done. The main reason for my return from the shadows earlier this year was because I knew the greatest Christmas present I ever had was c…

    ... +2, since it uses the floating bus to synchronize) is there because ...
    Metalbrain Metalbrain December 2017 Games
  • Modern Spectrum Games Advent CalendarSo... it is done. The main reason for my return from the shadows earlier this year was because I knew the greatest Christmas present I ever had was c…

    ... ;930186"]since it uses the floating bus to synchronize[/quote]
    I ... to fix in situ. The floating bus synchronization for the +2A/+3 ... handle both types of the floating bus. There’s plenty of time ...
    Ast_A_Moore Ast_A_Moore December 2017 Games
  • Space Invaders Emulator for the Spectrum 128/+2/+2A/+2B/+3My Space Invaders Emulator for the Spectrum 128/+2/+2A/+2B/+3 is now available for download from: [url="https://c.gmx.com/sizx@gmx.com/DVQXAXrLRl2d…

    ... the 16K), and uses the floating bus for syncing on all of ...
    Ast_A_Moore Ast_A_Moore December 2017 Brand new software
  • 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!…

    ... in simple terms what a 'floating bus' is? I read the Sinclair ... had always thought that a 'bus' was a term for a ...
    mik3d3nch mik3d3nch January 2018 Hardware
  • 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!…

    ... in simple terms what a 'floating bus' is? I read the ... when we use the term “floating bus” we refer to the data ... other changes, they “fixed” the floating bus problem, thus rendering the games ... first game to use the floating bus on these machines.
    < ...
    Ast_A_Moore Ast_A_Moore January 2018 Hardware
  • Some questions about the Timex TC2048/TC2068I have been doing some research about the specs of these 2 machines but I suppose it would be better to ask for advice in the forum since I have neve…

    ... ula attribute bytes on the floating bus, an example being Arkanoid. ... made the ts2068's expansion bus compatible with the zx81/ ... spectrum by changing the expansion bus to be compatible with ... the z80 cpu to recover floating bus behaviour (this is something ...
    Alcoholics Anonymous Alcoholics Anonymous January 2018 Hardware
  • Some questions about the Timex TC2048/TC2068I have been doing some research about the specs of these 2 machines but I suppose it would be better to ask for advice in the forum since I have neve…

    ... ula attribute bytes on the floating bus, an example being Arkanoid. ... made the ts2068's expansion bus compatible with the zx81/ ... spectrum by changing the expansion bus to be compatible with ... the z80 cpu to recover floating bus behaviour (this is something ...
    Black_Cat Black_Cat January 2018 Hardware
  • 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
  • ForumsWe are aware that the forums have suffered with the CPU fix a few weeks ago. Fortunately, we were already working on new forums that will address the…

    ... , but the discovery of the floating bus on the +2A/+3 started ...
    Ast_A_Moore Ast_A_Moore February 2018 Updates
  • 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 complete emulation of the floating bus on the +2A/+3. Looks ...
    Ast_A_Moore Ast_A_Moore March 2018 Emulators
  • 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 complete emulation of the floating bus on the +2A/+3. Looks ... the proper operation of the floating bus emulation and add it to ...
    Fred Fred March 2018 Emulators
  • 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…

    Neat. Does it emulate the floating bus on the +2A/+3?
    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…

    [quote="Ast_A_Moore;936154"]Neat. Does it emulate the floating bus on the +2A/+3?[/quote]

    No, it doesn't yet :( I just did the +2A timings during the last month, and I forgot that there was a floating bus-like effect in these models...
    TheMartian TheMartian March 2018 Emulators
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Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
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    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
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    mel the bell on April 21
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    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
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  • +3 Disk drive motor
    AndyC on April 21
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    mel the bell on April 20

HitBox

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hikaru 1.4K 1.5K
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bus 4.3K 6.5K

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