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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…
... wrote:
I did the "floating bus" or port $FF fix with ... -
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…
... :
There's that damn floating bus again!
[/quote ... With the revelation that the floating bus is not implemented in hardware ... emulators do not emulate the floating bus effect, I don't ... the above posts,I think floating bus code can pretty much ... -
Beginner InfoI have trying to find some hardware information for use with assembly coding but havn't had much luck. For instance. How do I redirect the vertical …
... of exceptions) so the bus is left floating when the z80 wants ... on all 8 data bus bits, a floating bus means 255 is sitting ... on the data bus. So when ... throw garbage on the data bus when the z80 is looking ... -
What is an "Unknown Port"?Port FF is unknown and so can return screen data on a 48k/128k/+2 models. But what if no Kempston mouse is plugged in. Is Port DF classified as unkno…
Woody calls them "unattached ports" - if there's not hardware attached then the port read will return floating bus on 48k/128k based machines.
D. -
Spectrum Game CompatibilityHi, At the moment I have a spectrum 48k. I am planning to get a 128k +2, but I have a problem. Will my 48k games work on 128k +2? Because some of the…
... the ULA and removed the floating bus effect. Although this was a ... -
Spectrum Game CompatibilityHi, At the moment I have a spectrum 48k. I am planning to get a 128k +2, but I have a problem. Will my 48k games work on 128k +2? Because some of the…
... the ULA and removed the floating bus effect. Although this was a ... -
Spectrum Game CompatibilityHi, At the moment I have a spectrum 48k. I am planning to get a 128k +2, but I have a problem. Will my 48k games work on 128k +2? Because some of the…
... the ULA and removed the floating bus effect. Although this was a ... -
RealXThis may be a dumb question but will RealX ever get released?
Also, it looks like some documentation errors exist in Ramsoft's floating bus article. It neither matches the real machine's behaviour or RealSpec's implementation. -
The New SPIN releases ThreadOk, as I'm now working on SPIN again full-time, and as a very wise man once said, "Release Early, Release Often"[1]... I'm going to release new SPIN…
... /> Anyhow, A7 on the address bus during refresh cycles is still ... first display byte on the floating bus appears after 14339 cycles for ... -
RealXThis may be a dumb question but will RealX ever get released?
... , electron beam offset, snow effect, floating bus) using more modern hardware, so ... -
RealXThis may be a dumb question but will RealX ever get released?
... snow mechanism and all our floating bus tests match the real 48k ... -
RealXThis may be a dumb question but will RealX ever get released?
... of the ULA's private bus are crossed in the 48K ... snow mechanism and all our floating bus tests match the real 48k ... -
Arcadia - by ImagineArcadia, by imagine. I thought I'ld play this last night, but its pretty awful to control Anyone know whats with the random movement and occasional…
... (port 127) which contains the floating bus value when read outside of ... -
Announce: Fuse 0.8.0Version 0.8.0 of [url=http://fuse-emulator.sourceforge.net/]Fuse[/url], the Free Unix (and OS X) Spectrum Emulator has been released. The major chang…
Sidewize is (in)famed for being tricky to emulate due to its use of the floating bus effect to synchronise the display, which is almost certainly what's going on here. Thanks for the bug report. -
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…
... /+3 mode).
For floating bus, Cobra is a moderately easy ... -
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…
... contended IO read of the floating bus (because that T-state is ... -
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…
... contended IO read of the floating bus (because that T-state is ... -
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…
... /> 1. The wiki documents the floating bus timing and how contention affects ... -
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…
... difference.
However, if the floating bus timings on the Wiki are ... are correct by watching the floating bus, which means the IO contention ... -
Kempston on real machines and on emulatorsRecently I've tested several 48K games on my Spectrum +2A with Kempston interface. The computer resets when I start the game. I've tried with two dif…
Floating bus (vague apologies for the short reply, but have to go to work). Cobra doesn't run at all on a +2A/+3, independent of the control method. -
Kempston on real machines and on emulatorsRecently I've tested several 48K games on my Spectrum +2A with Kempston interface. The computer resets when I start the game. I've tried with two dif…
[QUOTE=Philip Kendall;215801]Floating bus (vague apologies for the short ... at this subforum talking about floating bus. If I had more hardware ... -
Kempston on real machines and on emulatorsRecently I've tested several 48K games on my Spectrum +2A with Kempston interface. The computer resets when I start the game. I've tried with two dif…
... 't matter too much... the floating bus is a slightly strange side ... -
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…
... research done before adding contention, floating bus and accurate screen sampling to ... -
Speccy emulation with R4 - DSpec, ZXDS & SpeccyDS...Finally got an R4 card up & running, and I've installed DSpec, ZXDS & SpeccyDS onto it, but I've a couple of questions I'm hoping somebody can help w…
... . The features include contention and floating bus emulation, accurate screen sampling, better ... -
Speccy emulation with R4 - DSpec, ZXDS & SpeccyDS...Finally got an R4 card up & running, and I've installed DSpec, ZXDS & SpeccyDS onto it, but I've a couple of questions I'm hoping somebody can help w…
... . The features include contention and floating bus emulation, accurate screen sampling, better ... -
Speccy emulation with R4 - DSpec, ZXDS & SpeccyDS...Finally got an R4 card up & running, and I've installed DSpec, ZXDS & SpeccyDS onto it, but I've a couple of questions I'm hoping somebody can help w…
... . The features include contention and floating bus emulation, accurate screen sampling, better ... -
Kempston on real machines and on emulatorsRecently I've tested several 48K games on my Spectrum +2A with Kempston interface. The computer resets when I start the game. I've tried with two dif…
... 48K and 128K. Removing the floating bus broke what? 3 games? Not ... -
The new GP2Xpectrum releases threadYeah, I know the thread title isn't exactly too original, but I've decided that just one post to hold all updates makes more sense than a lot of smal…
... instead of 4.
- Improved floating bus emulation, now passes floatspy test ... -
Arkanoid and +2A, problems??Is there any kind of incompatibility with Arkanoid in a +2A? I load the game but when it's time to play, the stick doesn't move and nothing happens, …
... Arkanoid requires the standard spectrum "floating bus" behaviour that the +2A doesn ... />
(In some cases, the floating bus check code can be replaced ...
