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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 ... 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=" ... -
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 ... -
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 ... -
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 -
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 ... -
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 …
... aligned with the sea, Arkanoid (floating bus version) works fine.
1) The background color is black on the left ... -
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 ... contains 48K BASIC.
[COLOR="Red"]Bit 5: If set ... until the computer is reset.[/COLOR][/SIZE][/CODE]
I ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
[COLOR="Red"][I]It works! I ... wasn't good enough![/I][/COLOR]
[SIZE="1"](TM [ ... but with proper PAL syncs. Floating bus and "ULA snow" is present ... converting ROMCS from the rear bus into an input signal, ... ROMCS pin from the rear bus had been pulling ROMCS ... -
ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…
... -20 recently. It was the color of the ceiling in the ... fixable. You can fake the floating bus by adding a resistor and ... -
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…
... ? I assume to get higher color (8x1 attribute clash) then the ... number of games depend on floating bus behaviour. They will sit in ... remember the section on the floating bus. Can you talk about that ... -
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…
... ) get the result of the "floating bus". This will be 255 when ... ]
In Timex machines floating bus is 0, if I remember ... , the value for the default color attribute. Unless you mean something ... -
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…
... played, the current permanent border color (which is normally black) is ... up, I change the border color to red briefly a few ... Spectaculator doesn’t emulate the floating bus on a +2A/+3 properly ... -
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 ... . Press key "0(zero)", border color will change to black, and ... " again, and again, until border color will return to white. If ... 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 ... . Press key "0(zero)", border color will change to black, and ... " again, and again, until border color will return to white. If ... 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 ... . Press key "0(zero)", border color will change to black, and ... " again, and again, until border color will return to white. If ... 0 button changes the border color in the following order: black ... -
Test of screen switching timings.I modified the btime.tap test by Jan Bobrowski to explore the timing of screen switching. The new test, ptime-128, produces different results on diff…
... solve the mystery of the floating bus on the +2A/+3, so ... stripe (4 px of each color) appears at cycle 14353.
Limitations of emulationsYears ago at a trade fair, I got chatting to the guys who programmed [i]Gyron[/i]. They were demonstrating it and showed me an undocumented feature: …
... frames, each displaying a different color. This results in a slightly ... discovery and description of the floating bus on the Spectrum +2A/+3 ... to code) is the color brightness levels in 48K Spectrums ... non-bright variety of each color decreases as the they “ ...Limitations of emulationsYears ago at a trade fair, I got chatting to the guys who programmed [i]Gyron[/i]. They were demonstrating it and showed me an undocumented feature: …
... frames, each displaying a different color. This results in a slightly ... discovery and description of the floating bus on the Spectrum +2A/+3 ... to code) is the color brightness levels in 48K Spectrums ... non-bright variety of each color decreases as the they “ ...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…
... right, the game uses the floating bus for frame syncing. To cover ... br /> [/code]
The floating bus loop itself looks like this ... /> port1 ld de,$710f ;ATTR color INK 1 + YELLOW PAPER (6 ... d ;[4]test for ATTR color
v_sync_sw jp nz,v_sync ...Fastest emulator screen renderingHi, I'm developing an algorithm for fast emulator screen rendering and here is what I came up with. 1) Use 4bpp indexed image format as target …
... cover border writes, and multi-color modes. I read somewhere that ... read whatever's on the bus, and detect that the ray ... />
It's the ULA "Floating Bus" and yeah, it generally returns ...Fuse/SPIN vs Spectaculator border timingsHello, I'm trying to figure out at which moments the 48K ULA samples the current border color into its internal latch. To do that I wrote a small …
... was believed there is no floating bus to test it with (which ... late and still change the color of the pixel which aligns ... "]this post[/url]), where the color bleeds into the previous pixel ...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…
... /> Added ULA Snow effect, and Floating bus based on RamSoft's technical ...ANN: Spectaculator 2.5 available for downloadHi. I've just released a new version of Spectaculator, available from [url="http://www.spectaculator.com/"]http://www.spectaculator.com/[/url]. Hopef…
... />
Emulation
- Floating bus emulation as per Ramsoft technical ...Emulation accuracy and how it affects softwareHi folks. I was thinking of bodging together a rudimentary Spectrum emulator myself, not as a competitor to the other emulators, but as an integrate…
... /> Hardware quirks such as the 'floating bus' effect will also be absent ...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…
... /> + Much improved contended memory and floating bus emulation.
+ Improved display timings ...(Belated) ANNOUNCE: Fuse 0.7.0 and libspectrum 0.2.2 releasedThe Fuse team is pleased to announce that release of Fuse 0.7.0, the associated utilities and version 0.2.2 of the Spectrum emulator support library,…
... /> + Much improved contended memory and floating bus emulation.
+ Improved display timings ...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…
... opcode contention timings.
- Improved floating bus emulation.
- A 1 cycle ...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…
... 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 …
... works ok.
4. Floating Bus implementation. I use this to ...Problems with games on +2AHi! I have a +2A now and have problems running some games on it. I tought the resistor fix (to give it some kind of "floating bus" as the original 4…
... give it some kind of "floating bus" as the original 48k and ...
