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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 ... 1 cycle on 48k and 3 cycles on 128k, at least ... ?). However, as far as the floating bus is concerned, the very same ... .zip"]floatspy[/URL] program.
Woody's [URL="http://homepage.ntlworld ... -
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…
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…
... , Spectrum +2A (and probably +3) do have floating bus port. But it is ... that +2A does not have floating bus port, but it's incorrect ... .
I think Spectrum +3 have the same behavior.
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 ...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]?
-StephenNeed 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…
[quote="Woody;921831"][quote="weiv;921830"]Looks ... the mysteries of the +2A/+3 floating bus. Thanks so much to all ... . =D>
[quote="Woody;921840"]And port #0FFD continues ...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…
[quote="Woody;921831"][quote="weiv;921830"]Looks ... the mysteries of the +2A/+3 floating bus. Thanks so much to all ... I persevered. :D
@Woody Good job! Your timings are ...New emulator: InkSpector 2Hi, The first preview of InkSpector 2 is available from www.inkland.org.uk/inkspector/inkspec_2.0.0.27.exe It's a brand new emulator with all …
[quote="inky;957436"]Cheers Woody! Feel free to post, PM ... perfect on 48K and +3. The +3 floating bus wasn't emulated though you ... of its existence? My issue2/3 real machine or running on ...New emulator: InkSpector 2Hi, The first preview of InkSpector 2 is available from www.inkland.org.uk/inkspector/inkspec_2.0.0.27.exe It's a brand new emulator with all …
Thanks for those, Woody, I'll take a look. No, I hadn't implemented +3 floating bus at all.
There's no such thing as "nitpicking" when it comes to Speccy emulation :)Inkspector 2.0 (final) releasedI’ve just released Inkspector 2.0 final (there was a preview version released before Xmas). It’s a new emulator for Windows with all-new code (non ca…
... Spectrum behaviours including the +2A/+3 floating bus) it has a built-in ...Russian Translations...As i have once again been reminded (by the "Homebrew games" thread), there are some funky looking Russian games that I can't play due to not understa…
... appear to be the +2A/+3 incompatibility (as with the Russian ... was aware of the +2A/+3 "floating bus" (or lack of) issue and ...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 need to know how floating bus works in extended paging mode ... need to know about +2A/+3 floating bus for using it in new ...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…
... need to know about +2A/+3 floating bus for using it in new ...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 need to know how floating bus works in extended paging mode ... need to know about +2A/+3 floating bus for using it in new ...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 need to know how floating bus works in extended paging mode ... need to know about +2A/+3 floating bus for using it in new ...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…
Looks like we solved all the mysteries of the +2A/+3 floating bus. Thanks so much to all participants of the exploration! :)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…
[quote="weiv;921830"]Looks like we solved all the mysteries of the +2A/+3 floating bus. Thanks so much to all participants of the exploration! :)[/quote]
Indeed! Thanks to all! :)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 ended up having the +3 floating bus tied to the display renderer ...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 ...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…
... decided to tackle the floating bus on the +2A/3 was because I ... or was that only a floating bus test aid?[/quote]
... Yes, just a floating bus visual gimmick. That’s the ... amp;action=defaultclick"]the +2A/+3 floating bus version of SpecEmu[/url], as ...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…
... in a loop reading the +3 floating bus through port 0x0ffd. I don ... also hangs on specemu in +3 mode.
Edit:
floating bus reading through 0x40ff. This should ...The latest build of Specemu?The latest version of Specemu (a fantastic emulator, BTW) I have is SpecEmu-3.1.b150912.zip, which is a year old now, but knowing Woody he's probably…
... ://keybase.pub/woodywoodster/specemu/specemu-3.2.b311221.zip[/url]
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Didn't fix the +3 floating bus for this release! (I knew ...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…
... thing here is the new +3
disk support, ... a paging bug in the +3 code
... Added ULA Snow effect, and Floating bus based on RamSoft's technical ... symbol keys.
Added +3 Floopy drive emulation - full read ...
Thanks,
Dunny+Woody.ANN: SpecEmu 2.3 - Minor UpdateHere's a minor update to the SpecEmu emulator - the emulator with an incredibly small filesize for a Win32 application, and backed up with an incredi…
... boot :)
Version 2.3 is available at:
[url ... opcode contention timings.
- Improved floating bus emulation.
- A 1 cycle ...New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …
... />
having added the +2A/+3 emulation recently, I want to ... the screen bytes. Obviously the floating bus can't be used to ... really appreciate if some +2A/+3 owner would run the ptime ...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…
... -from-people-with-a-2a-3"]here[/url] to get a ... the mystery of the elusive floating bus on these machines, and no ... if I can fetch a bus value from it. Now, I ... ), and skip ULA/bus polling on a +2A/3, but if @chernandezba ...Compatibility of Spectrum 128K and +3I wondered if the are any compatibilty problems between software running on the 128K and the +3. e.g. if I would connect a disk drive to the 128K wou…
... to define the lack of floating bus as an extension, in which ... use!), will run on a +3, won't run on a ... , convoluted but that's why Woody said "almost".
[ This ...128k, +2, +3ok i`ve asked a lot of questions over the few days but this is gonna be my final one on whats what unless i get lost once i get my apeccy so here goe…
... 21:35, Woody wrote:
There's that damn floating bus again!
floating bus is not implemented in hardware on unmodded +2a/+3 systems ... emulators do not emulate the floating bus effect, I don't ... the above posts,I think floating bus code can pretty much ...Emulator Comparison ChartHi. In a similar vein to [URL=http://www.ppest.org/zx/zxse.php]Piters[/URL] comparison of various ZX emulators, I've been looking at adding some deta…
... , 128K and +2A/+3 mode).
For floating bus, Cobra is a ... -level test suite. I know Woody has something similar as well.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…
... Z80 perhaps samples the IRQ 3 states later after ULA pulls ... pulled it low. But not 3. Besides, if that was the ... start counting from the interrupt (woody's float48k). And yet some ... contended IO read of the floating bus (because that T-state is ...
