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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 I ... Z80 wants to initiate a bus cycle that might affect contended ... Z80 can only read FFh (floating bus).
Convinced myself about ... only contends the I/O bus cycle if A8-A15 falls ... -
Sinclairean A3[B]Sinclairean[/B], a new ZX Spectrum emulator written in machine code for x86-compatible, OpenGL-capable computers. Features: [LIST] [*]Fast machin…
... memory not emulated yet
[*]Floating bus not emulated yet
[*]Quick ... -
JSpeccy: New emulatorHi there, Jos? Luis S?nchez (zx81 at ono dot com) has developed a new ZX Spectrum emulator in Java, with a very accurate Z80 emulation. The message …
... emulation (Uridium, Overscan Demo)
- Floating bus emulation (Arkanoid, Sidewize)
- Speaker ... -
IM2 Loading on +3EHi there Speccy Guru's, As some of you know, I've spent a while building the ultimate image for +3e, it's currently at 6000+games and demos and i've…
... 's not due to the floating bus, maybe the real hardware changes ... -
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 ... -
Contention detectionJust a thought, based on discussion elsewhere... Is there any way of telling if reads/writes are being contended around the time that they happen? L…
... .
There's the floating bus method, for telling whether the ... -
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…
... plus software that requires the floating bus. 128 software that requires the ... -
Shadow ROM partial decoding not implemented in emulatorsOr at least, not implemented in Spectaculator, and it seems that not in Fuse too. [URL="http://www.speccy.org/foro/viewtopic.php?f=8&t=408&start=53"…
... from the main ROM, not floating bus (ULA/FFh), of a mirror ... -
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 …
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 …
... with 48K display timings
Floating bus and contention emulation model (not ... with digital TVs)
Expansion bus connector
I ... to load
Implement a floating point co-processor usable as ...Timing of Timex Computer 2068Is the timing of the Timex Computer 2068 fully documented yet? I have one here with the ZX Spectrum Emulator cartridge and have downloaded a few test…
... on the Timex not a floating bus. I'm wondering how to ... only part of the SCLD bus is coupled to the Z80 ... bus via resistors. I have seen ...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 ...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…
... to switch on the scope. Floating bus seems to behave okay. DMM ... 's nothing else on the bus. Logic levels on the Z80 ...****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…
... diferent implementation for each machine (floating bus in 48K, shadow screen in ...Using even ports for input?I've been looking for unused ports to use with my clashbasher interface. I understand that the spectrum only considers A0 when decoding its input p…
... high byte of the address bus is used to select ... be any contention on the bus because that's the ... on a spectrum with a floating bus it should be fine shouldn ... through contention on the data bus? Are there othere models of ... having done away with the floating bus.Port $28FF. Why 28?Testing floating bus behaviour for ZXUno, I've found that both Cobra and Arkanoid use this specific 16-bit port: $28FF. What is so special about putt…
Testing floating bus behaviour for ZXUno, I've found that both Cobra and Arkanoid use this specific 16-bit port: $28FF. What is so special about putting the value $28 in A15-A8 during a read to $FF?
Thank you very much in advance! :)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, …
... the screen bytes. Obviously the floating bus can't be used to ...Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …
... , as is the NMI and floating bus. The ROM checksum is also ...[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 ...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…
... symbol (*) is shown
Improved floating bus value
Updated Z88 OZ ...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…
... case someone suggests using the floating bus - that's what I'm ...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…
... the mystery of the elusive floating bus on these machines, and no ... if I can fetch a bus value from it. Now, I ... this anyway), and skip ULA/bus polling on a +2A/3 ...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…
... to him for that!). Also, floating bus of +2A/+3 is emulated ...Programs with strict timing requirements.Hi, all, I am a bit stuck about the timings of my SpecIde emulator. (https://github.com/MartianGirl/SpecIde) The thing is, I think that the tim…
... , the programs from the +2A floating bus thread, shock, overscan, mda, hercules ...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…
... (Issue 2/3, contended memory, floating bus, snow effect...)
- Pixel-perfect ... /+2. (Also with contended memory, floating bus, snow effect...)
- Pixel- ... 've implemented the contended memory, floating bus port...)
- Kempston and Sinclair ...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 …
... WPA 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…
... 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 ...ArcadiaIt's been bugging me for years - why does your ship in Arcadia wobble all over the place with a tendency to veer to one side? Was that intentional or…
You need to play it in an emulator (such as SPIN or Spectaculator) with the Fuller joystick attached. The game assumes that there is one, and the lack of one combined with floating bus behaviour produces that effect.
D.Detecting +3 or +2AIs it possible to detect whether your BASIC program is running on a +2A/+3 or a proper 128?
... /+3 don't have a floating bus effect so you'll always ...
