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<1234567…34>
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... bit with memory contention and floating bus stuff in ZXDS and there ... seem to appear on the floating bus.

    To be ... ?). However, as far as the floating bus is concerned, the very same ... .html"]tech doc[/URL] about floating bus.
    Ramsoft's [URL=" ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • 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…

    ... and exact info about the floating bus behavior and timing. An explanation ...
    Patrik Rak Patrik Rak November 2007 Emulators
  • Floating bus on 128K models[b]Background:[/b] i need run code with interrupt enabled but i need use stack instruction to maximize performance in copy/shift/mirror routines. dur…

    ... /> questions are:
    1) is floating bus present on all of 128 ...
    Fikee Fikee November 2010 Development
  • Emulating a +2A with floating bus modBefore I start hacking Fuse's source... Does any existing emulator have an option to behave as a +2A with the [URL="http://www.secarica.ro/html/plus…

    Before I start hacking Fuse's source...

    Does any existing emulator have an option to behave as a +2A with the [URL="http://www.secarica.ro/html/plus3_hardware.html#inFFport"]floating bus modification[/URL]?

    -Stephen
    stephenw32768 stephenw32768 October 2013 Emulators
  • 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…

    ... (and probably +3) do have floating bus port. But it is not ... that +2A does not have floating bus port, but it's incorrect ...
    chernandezba chernandezba January 2016 Hardware
  • SPIN Public Beta 0.1b Available for downloadHi all, back again, and as just recently announced on CSS, SPIN has been updated. Here's the post to CSS (or the relevant parts): It's been a bu…

    ... little - sounds better now, especially AY Sound.

    Added MRU ... /> Added ULA Snow effect, and Floating bus based on RamSoft's technical ... accuracy, and stuff like the AY and
    Beeper sound has ...
    Dunny Dunny May 2002 Emulators
  • Emulating the 128KeIt occurs to me that I wasn't frequenting WoSf when I created the 128Ke standard, which means some people haven't heard of it. Here it is: [url]http…

    ... 48K doesn't?

    AY sound and all the 128 ... plus software that requires the floating bus. 128 software that requires the ...
    chev chev April 2011 Emulators
  • A new ZX spectrum cloneOver the past 12 months i have been developing a new spectrum clone as a hobby project to waste my spare time on. It is still not fully complete yet …

    ... 48K display timings
    Floating bus and contention emulation model (not ... video RAM
    Stereo AY sound output mixed with beeper ... with digital TVs)
    Expansion bus connector


    Implement a floating point co-processor usable ...
    mspec mspec August 2012 Hardware
  • [NEW] Retro Virtual Machine v1.0.0 for OSX released!!!!Here it is! Retro Virtual Machine v1.0.0 RELEASED!!!! Many thanks first to Patrik Rak for the PZX format and for their Z80 tests without which RVM…

    ... % accurate).
    Emulation of the ‘floating bus’
    Emulation of the contended ... (only in the models with AY chip).

    Concurrency
    jcgamestoy jcgamestoy September 2015 Emulators
  • New stable version ZEsarUX-4.2Hi everyone! I have uploaded a new stable version of ZEsarUX emulator, version 4.2. You can download it from: https://sourceforge.net/projec…

    ... Pentagon 128
    Added .ay file player for Spectrum and ... CPC files
    Added AY Piano menu to view notes ... items that refresh continuously: waveform, ay registers, cpu stats, debug ... (*) is shown
    Improved floating bus value
    Updated Z88 OZ ...
    chernandezba chernandezba December 2016 Emulators
  • New emulator - Spectramine v.1.0b releasedI post the first release of my Spectramine emulator, with minimal functionality, for public testing of emulation quality and compatibility with games…

    ... /> For today, in addition to AY, Kempston joystick (on arrow keys ... to him for that!). Also, floating bus of +2A/+3 is emulated ...
    weiv weiv September 2017 Emulators
  • fzx32 on GP32 progressing nicelyJust to let you know that Rlyeh is working hard on his ZX Spectrum emulator fZX32 for the GP32 and should be released in the near future. Its based…

    ... /> - Accurate border emulation,
    - AY-3-8912 and beeper sound ... (multicolor effects),
    - Preliminary floating bus emulation,
    - Virtual Keyboard suppoprt ... - Ericcson chatboard support,
    - Crystal AY sound rendering output, using CHN ...
    Antiriad Antiriad December 2004 Emulators
  • How to detect 48k modeHow can you detect if a 128k machine is in 48k mode (from an emulation point of view, not via BASIC or machine code)? Checking the current rom? But …

    ... decoded and it returns the floating bus.
    [quote]
    2) When ... ]
    It's just the AY-3-8912A soundchip used in ...
    Luca Luca March 2005 Emulators
  • ANN: SpecEmu 2.7Go get it kids! [url]http://homepage.ntlworld.com/mark.woodmass/specemu.html[/url] :p

    ... from port 0x7FFD writes the floating bus value back to that port ... time to time.
    - Emulating AY sound on 48K machines became ...
    Woody Woody June 2008 Emulators
  • which one bit of hardware would people want re-made?I'm just curious in the sense of I see interface 1's go for a fair bit on ebay and also multiface units etc.. so whats the one thing that you don't …

    ... 't. Also there's no floating bus on the Timex, and even ... .pl/ay48k_demos.html[/url] with AY connected into the twisterboard.
    bus.

    Hm ...
    Mister Beep Mister Beep November 2009 Hardware
  • Mistake in the 128K technical FAQ?[url]http://www.worldofspectrum.org/faq/reference/128kreference.htm[/url] [quote]Memory banks 1,3,5 and 7 are contended.[/quote] Really? I thought i…

    Quicker and easier would be to try reading from the AY [i]data[/i] port. Floating bus => 128K, same as AY [i]register[/i] port => +2A/+3. Might make debugging on some emulators harder though.
    Philip Kendall Philip Kendall April 2010 Hardware
  • What Spectrum to choose?Hi i'm new to the Spectrum. I read 'bout it in CDA (Polish game magazine) and watched LGR review of the 48k and it REALLY interested me. What model m…

    ... 't run because of the floating bus and that can be bodged ... the +3 is the awful AY output.
    [QUOTE=Arda;495219 ... tape input etc) with better AY sound.

    In what ... games, cause if *fixes* the floating bus, which is only there because ...
    guesser guesser November 2010 Hardware
  • The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…

    ... a DivIDE+ and a Zaxon AY sound module. The DivIDE+ only ... been modified to fix the floating bus bug (not by me, previous ...
    Alien 8 Alien 8 December 2010 Hardware
  • The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…

    ... a DivIDE+ and a Zaxon AY sound module[/quote]

    AY sound mod, and the 48 ... ) the +2B sound mod, the floating bus mod, the joystick port mod ... , and the expansion bus mod.

    You'll ...
    chev chev December 2010 Hardware
  • The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…

    ... Sell the 48 with the AY sound mod, and the ... +2B sound mod, the floating bus mod, the joystick port mod ... DivIDE+ (possibly because the floating bus mod has been done) ... ? What's the expansion bus mod? Also, are there ... instructions for the +3 AY fix? I would like ...
    Alien 8 Alien 8 December 2010 Hardware
  • The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…

    ... a DivIDE+ (possibly because the floating bus mod has been done) would ... +3 edge connector. The expansion bus mod restores the ROMCS line ... definitive instructions for the +3 AY fix?[/quote]

    I ...
    chev chev December 2010 Hardware
  • Emulating the 128KeIt occurs to me that I wasn't frequenting WoSf when I created the 128Ke standard, which means some people haven't heard of it. Here it is: [url]http…

    ... ]

    +2A timings
    Floating bus support (needed for things like ... cause problems)
    reading the AY ports doesn't crash the ...
    chev chev April 2011 Emulators
  • Spectrum +3, Issue 2...I have just had plonked on my desk a nice issue 2 Spectrum +3. I'm not sure if its 100% working yet, as I have not plumbed it into a telly. So, assu…

    ... 2. Does this need the AY sound fix applying, or has ... the design flaw in the AY circuit. The "+3B" is really ... the games that need the floating bus on your +3 then yes ...
    guesser guesser December 2011 Hardware
  • Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…

    ... 128s is to do some AY I/O. On the unmodified ... . Or a test of the floating bus. I decided to go with ...
    introspec introspec September 2013 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…

    ... include: stable fullspeed everywhere, ingame AY music support on all 128K ... might know, this is partly floating bus-related, but the actual issue ... mechanism in the form of floating bus reads. This improves the situation ...
    Hikaru Hikaru April 2016 Games
  • 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 ... reliable data corder, better beeper/AY audio balance, etc. Oh, it ...
    Ast_A_Moore Ast_A_Moore September 2017 Hardware
  • 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 ... emulators these days is for AY composition on the ZX81 when ...
    moggy moggy December 2017 Chit chat
  • 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. ... spectrum by changing the expansion bus to be compatible with ... the z80 cpu to recover floating bus behaviour (this is something ... two joysticks read through the ay chip). Aside from the ...
    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. ... spectrum by changing the expansion bus to be compatible with ... the z80 cpu to recover floating bus behaviour (this is something ... two joysticks read through the ay chip). Aside from the ...
    Black_Cat Black_Cat January 2018 Hardware
<1234567…34>

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Related Threads

  • Contention and floating bus timingHello,<br /> <br /> I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit.…
  • 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…
  • "Floating" AY registersWhile I was working on some AY sample-related stuff, it occurred to me that with the AY port not being completely decoded, it would be a handy CPU-ti…
  • Floating bus on 128K models[b]Background:[/b] i need run code with interrupt enabled but i need use stack instruction to maximize performance in copy/shift/mirror routines. dur…
  • ZX81, AY, samples, SpecAY, AY files, etc.With the appearance of 3 different AY interfaces for the ZX81 in the past 6 months, I wonder...<br /> <br /> Is it possible to make the ZX81 "speak" …
  • Emulating a +2A with floating bus modBefore I start hacking Fuse's source...<br /> <br /> Does any existing emulator have an option to behave as a +2A with the [URL="http://www.secarica.…
  • Spectrum +2A floating bus portHi<br /> <br /> 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, onl…
  • CPU speed controller (SLOMO) + K-MOUSE + JOYSTICK + ZX BUS EXPANSION (3x throught zx bus)Anyone is interested of this hardware ?<br /> [img]http://velesoft.speccy.cz/other/km2016lp3d1.jpg[/img]<br /> <br /> It's horizontal version of K…
  • Case for Wonder-AY (or other cheap ay-sound interface)?Got meself a cap replaced ZX Spectrum with composite video mod :) Woohoo! I want to have an modern sd-interface + ay-interface, both cased... I've se…

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