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  • 128K Spectrum - can't figure out what's wrongLong time no post :) So I have this 128K Spectrum (+2 ROMs) that I cannot for the life of me figure out where the problem lies. Let's take a look a…

    ... data would not be stable (floating bus effect). If it was a ...
    1024MAK 1024MAK December 2014 Hardware
  • New 48K Spectum emulator on the Windows StoreHi, I've just uploaded a new "Free" Spectrum 48K emulator to the Windows Store, see: http://apps.microsoft.com/windows/en-gb/app/specwin48/4d54…

    Thanks RMartins/Korinel, I'll take a look at the floating bus & contended memory tests.

    Thanks Arjun, I'll look at the tape manager scrolling and .tap files.
    SpeccyBoy SpeccyBoy September 2015 Emulators
  • New 48K Spectum emulator on the Windows StoreHi, I've just uploaded a new "Free" Spectrum 48K emulator to the Windows Store, see: http://apps.microsoft.com/windows/en-gb/app/specwin48/4d54…

    ... which fixes contended memory and floating bus (all tests are passing). Great ...
    SpeccyBoy SpeccyBoy September 2015 Emulators
  • Understanding the Kempston joystick circuitHere is the schematics: http://www.retroisle.com/sinclair/zxspectrum/Technical/Hardware/KempstonJoystickInterface-Schematics.php Ok, the 74LS138N …

    ... value transferred on the data bus (the IN I/O instruction ... is referred to as the floating bus affect and is caused by ... chips connected to the data bus and the stray capacitance from ... screen data will override the floating bus value. So to sum up ...
    1024MAK 1024MAK October 2015 Hardware
  • PUSH scrollers 3[url=https://drive.google.com/file/d/0B-KEeni1WXmoYk9Dek1zVnd6Rk0/view?usp=sharing]CATS - Faith edition (example)[/url] Hello and welcome to the w…

    ... data present on the ULA bus, which will be a display ... /the-sidewize-test-zx-spectrum-floating-bus-shenanigans/]Sidewize[/url] because I ...
    Hikaru Hikaru November 2015 Development
  • NTSC Compatibility?Correct me if I'm wrong, but wasn't the Timex 2068 the only NTSC clone built of the ZX Spectrum? And I use clone lightly... From what I underst…

    ... number of games depend on floating bus behaviour. They will sit in ... remember the section on the floating bus. Can you talk about that ...
    cbmeeks cbmeeks December 2015 Games
  • Spectrum +2A floating bus portHi As I discovered in the past, Spectrum +2A (and probably +3) do have floating bus port. But it is not shown on all unused ports, only on some po…

    ... , all of which will return "floating bus" values.
    As soon as ... number of unused and therefore "floating bus" addresses.

    [b][i ...
    1024MAK 1024MAK January 2016 Hardware
  • 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…

    ... /forums/discussion/51886/spectrum-2a-floating-bus-port#latest]this[/url]? I ...
    Hikaru Hikaru March 2016 Games
  • BrexitThere's nothing like a nice healty Brexit to start the day!

    ... time to move up the bus, when he wasn't looking ... waster sodded off the bus

    3)regardless of who he ... ) found out later the idiot bus drivers let him on regularly ... one specifically as it had 3 elements (what he was doing ...
    fog fog June 2016 Chit chat
  • Question - SAMS Timex Sinclair 2068 Beginner/Intermediate GuideHi all, I just acquired a T/S 2068 and the a book that came with it is, SAMS Timex Sinclair 2068 Beginner/Intermediate Guide. On page 18 of thi…

    ... . Most important is probably the floating bus. Some spectrum games will try ... to read bytes from the floating bus to find out when the ...
    Alcoholics Anonymous Alcoholics Anonymous August 2016 Hardware
  • Spectrum +2A floating bus portHi As I discovered in the past, Spectrum +2A (and probably +3) do have floating bus port. But it is not shown on all unused ports, only on some po…

    ... isn't consistent with the floating bus behavior on 48K etc (255 ...
    Hikaru Hikaru August 2016 Hardware
  • Spectrum 128k+2 on tvHi, I want to buy a 128+2, did have one years ago, can i let it work on a flat tv screen, if so what do i need to do this.

    ... with games that need the floating bus (Sidewize, Arkanoid etc), and operates ...
    balford balford January 2017 Hardware
  • ****ing Awesome Spectrum Engine (FASE)This is a new engine (sprites, tiles, map) for all ZX Spectrum machines. The engine set ups a runtime enviroment that leave between 24K and 30K byt…

    ... . If 48K it uses the floating bus to syncronize. If 128K it ...
    antoniovillena antoniovillena February 2017 Brand new software
  • ****ing Awesome Spectrum Engine (FASE)This is a new engine (sprites, tiles, map) for all ZX Spectrum machines. The engine set ups a runtime enviroment that leave between 24K and 30K byt…

    [quote="antoniovillena;895817"]...
    ... If 48K it uses the floating bus to syncronize. ...
    [/quote]
    I'm intrigued by this feature in particular, I have to take a look at that readme.html
    RMartins RMartins February 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!…

    ... is code that uses the floating bus values.

    As each ...
    1024MAK 1024MAK April 2017 Hardware
  • Correction of +2 hardware errorsThis is a collection of various pieces of information picked up from various places, including a lot from this forum. I have edited it and reworded i…

    ... read of port 7FFD (write floating bus data)
    - access to I ...
    Renegade Renegade April 2017 Hardware
  • Double Buffering Artefacts on Real HardwareI have a project that I've played around with for a while and always tested using emulators, either ZX Spin or Spectaculator. It is a 128k game th…

    ... ;909891"]
    In Timex machines floating bus is 0, if I remember ... . Reading an unattached port, the bus (except D2) will float in ...
    Alcoholics Anonymous Alcoholics Anonymous May 2017 Development
  • A problem with the divMMC Future interfaceHere's my second attempt at posting this: I bought a divMMC Future, which allows you to load and save Spectrum games in seconds. It does this very…

    ... will instead get either 255 ("floating" bus value) or a number corresponding ...
    1024MAK 1024MAK June 2017 Hardware
  • Can Arkanoid be played using a Kempston joystick?It says so in the instructions but annoyingly without saying how. I load it up and no matter what button I start the game with, it won't work with a …

    ... though in order to take floating bus reads out of the picture ...
    Hikaru Hikaru June 2017 Games
  • Interrupts, 16k Spectrums and snowI'm writing something for the 16k Spectrum and I want to use interrupts. The avilable documentation doesn't seem clear enough for me to figure out ho…

    ... 48K/128K; if there are bus-noisy peripherals connected, you'll ... you're already using the floating bus. It's something similar or ... on these frames that the bus-noise effect would be coming ...
    Hikaru Hikaru August 2017 Development
  • Interrupts, 16k Spectrums and snowI'm writing something for the 16k Spectrum and I want to use interrupts. The avilable documentation doesn't seem clear enough for me to figure out ho…

    ... area will respond with a "floating bus" value (normally 255, but may ... (the address on the address bus is the current contents of ...
    1024MAK 1024MAK August 2017 Development
  • Interrupts, 16k Spectrums and snowI'm writing something for the 16k Spectrum and I want to use interrupts. The avilable documentation doesn't seem clear enough for me to figure out ho…

    ... advantadge of using the Sidewize/floating bus teqhnique over IM2 as you ...
    Mysterion Mysterion August 2017 Development
  • Interrupts, 16k Spectrums and snowI'm writing something for the 16k Spectrum and I want to use interrupts. The avilable documentation doesn't seem clear enough for me to figure out ho…

    ... /> I decided to keep the floating bus sync (and I do it ... hit at 50hz
    2) Floating bus to sync start of drawing ...
    evilpaul evilpaul August 2017 Development
  • Interrupts, 16k Spectrums and snowI'm writing something for the 16k Spectrum and I want to use interrupts. The avilable documentation doesn't seem clear enough for me to figure out ho…

    ... /> I decided to keep the floating bus sync (and I do it ... hit at 50hz
    2) Floating bus to sync start of drawing ...
    Hikaru Hikaru August 2017 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…

    ... represent bytes read off the floating bus port, #0FFD in this case ...
    Hikaru Hikaru September 2017 Development
  • Need help from people with a +2A/+3Not sure where to post this. This is a plea to people with the actual hardware, naturally. Could you run this little program (both TAP and WAV fil…

    Makes no difference. I’m testing a floating bus hypothesis, which has been . . . uh . . . floating around. ;)
    Ast_A_Moore Ast_A_Moore September 2017 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…

    ... ://www.dropbox.com/s/ufq9eftnsq9lsoh/floating-bus-1.png?dl=1[/img ...
    colonel32 colonel32 September 2017 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…

    ... represent bytes read off the floating bus port, #0FFD in this case ...
    Your Spec-chum Your Spec-chum September 2017 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…

    Forget ZEsarUX behaviour with floating bus port on +2A, it does ... has, some kind of a floating bus, but I still don't ...
    chernandezba chernandezba September 2017 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…

    ... Iraq[/i] that uses the floating bus for syncing on all Spectrum ...
    Ast_A_Moore Ast_A_Moore September 2017 Development
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