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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 ... .html"]tech doc[/URL] about floating bus.
Ramsoft's [URL="http ... -
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]?
-StephenANN: 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 ...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, it's ... a paging bug in the +3 code
Changed Reset ... /> Added ULA Snow effect, and Floating bus based on RamSoft's technical ... ; on symbol keys.
Added +3 Floopy drive emulation - full read ...ANNOUNCE: Fuse for Mac OS X 0.7.0Following the release of Fuse 0.7.0 is the unsurprising release of Fuse for Mac OS X 0.7.0 which should be available for download shortly at the Fuse…
... supports Max OS X 10.3, if you are running an ... /> + Much improved contended memory and floating bus emulation.
+ Improved display timings ...A few questions regarding EmuZwinA few questions regarding EmuzWin 1. I have been trying to write a program to generate multicolour effects on the Spectrum,ie more than 2 attributes…
... is a bug.
3. Occasionally the assembler seems to ... works ok.
4. Floating Bus implementation. I use this to ...A few questions regarding EmuZwinI had posted this in the development forum and then remembered there was an emulators forum, so apologies for the repetition. 1. I have been trying …
... is a bug.
3. Occasionally the assembler seems to ... works ok.
4. Floating Bus implementation. I use this to ...Hardware GuideI was thinking this might make a good sticky... [b]Service Manuals[/b] [URL="ftp://ftp.worldofspectrum.org/pub/sinclair/technical-docs/ZXSpectrum48K…
... .netfirms.com/plus3.html"]Spectrum +3 Machines, Software and Spares[/URL ... ] -many things on the +3 by John King
[URL ... /floatingbus.html"]The Floating Bus Explained[/URL] -Info about the Floating Bus and the ...Fuse for Mac OS X 0.8.0.1A bug fix version of Fuse for Mac OS X has been released soon or already here at WoS and at the dedicated sourceforge project: [url]http://sourcefor…
... -0.3.0.1
[list]
[*] Fix IN timings and floating bus ...RUSSIAN SOFTWARE and real ZXRussian ZX games is writed on russian ZX clones and support hardware feature TURBO OFF ( for ZX clone ZS SCORPION ). Russian ZX clone ZS SCORPION use…
... and CPU read data from floating bus ( value #FF ). Software TURBO switching ... SCORPION is on ZX+2A/+3 models ifnored (without effect) and ... always at original ZX speed (3.5 MHz)
... ZX128 models(ZX128/+2/+2A/+3/russian clones):
[IMG]http ...IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…
... -A15 during an I/O bus cycle.
What ... Z80 wants to initiate a bus cycle that might affect ... Z80 can only read FFh (floating bus).
Convinced myself ... only contends the I/O bus cycle if A8-A15 ... models (issue 2, issue 3 with a 5C112E-2 ULA ...Tricks with IN 31It's generally considered unwise to use a Kempston joystick's fire button to start a game, because the floating bus effect can make arbitrary data ap…
... start a game, because the floating bus effect can make arbitrary data ... all be 0?
* bits 3-2 (up/down) will never ...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…
... works on a 48K issue 3 machine and anything that works ... of the 128s (excluding the +3). Everything just works. If you ... . This will even work for +3 and Pentagon titles that don ... plus software that requires the floating bus. 128 software that requires the ...ZX Spectrum 48K clone and test resultsHi! This is my first post, so, first of all, I'd like to say hello to the whole community! I am Alessandro Dorigatti from Italy and I'm developing …
... it mounts a real Z80, 3 SRAM chips (512K, 128K, 512K ... aligned with the sea, Arkanoid (floating bus version) works fine.
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 …
... is as follows:
3.5MHz Z80 CPU with 7MHz ... with 48K display timings
Floating bus and contention emulation model (not ... with digital TVs)
Expansion bus connector
... load
Implement a floating point co-processor usable as ...Enable 128kB paging in emulatorFrom Zx Spectrum documentation ([url]http://www.worldofspectrum.org/faq/reference/128kreference.htm[/url]) [CODE][SIZE="1"]When memory is being pag…
... 0x7ffd produces no special results: floating bus values will be returned as ... at 0xc000.
Bit 3: Select normal (0) or shadow ...Tricky ZX RepairHello guys, This time I put my hands on a very nice Issue 3 16K, upgraded to 48K. To bertter explain "nice", it is absolutely mint, not a scratch on…
... on a very nice Issue 3 16K, upgraded to 48K. To ... , halting with the first 1/3 of the screen still with ... to switch on the scope. Floating bus seems to behave okay. DMM ... 's nothing else on the bus. Logic levels on the Z80 ...[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 ... (I think).
40 tracks (3’’) and 80 tracks double side ... (3’’ 1/2) supported.
... view in the ZX Spectrum +3.
Snapshot’s management view ...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…
... 3ffd and crashes running +2A/+3 ROMS with real video enabled ... symbol (*) is shown
Improved floating bus value
Updated Z88 OZ ...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…
SpecIde updated!Hi, all! In these past months I've been brushing up a bit my emulator, SpecIde, a.k.a. the least efficient emulator in the world. At this momen…
... extras. (Issue 2/3, contended memory, floating bus, snow effect...)
floating bus, snow effect...)
... 3. (This is new; I've implemented the contended memory, floating bus ... -so-good FDC765 and +3 disk drive emulation. Read ...ZXDS 2.0.0Hello, after few months of intense work, I am finally ready to announce [url="http://zxds.raxoft.cz"]new ZXDS release[/url] for Nintendo 3DS. The …
... instead of WEP, or floating bus emulation for +2A/+3 machines.
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 ...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 ...Detecting +3 or +2AIs it possible to detect whether your BASIC program is running on a +2A/+3 or a proper 128?
... 255 used for on the +3?
[/quote]
Testing ... port. The +2A/+3 don't have a floating bus effect so you ...
