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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…
... /> I decided to keep the floating bus sync (and I do it ... hit at 50hz
2) Floating bus to sync start of drawing ... -
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... represent bytes read off the floating bus port, #0FFD in this case ... -
Need help from people with a +2A/+3Not sure where to post this. This is a plea to people with the actual hardware, naturally. Could you run this little program (both TAP and WAV fil…
Makes no difference. I’m testing a floating bus hypothesis, which has been . . . uh . . . floating around. ;) -
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... represent bytes read off the floating bus port, #0FFD in this case ... -
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Forget ZEsarUX behaviour with floating bus port on +2A, it does ... has, some kind of a floating bus, but I still don't ... -
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... Iraq[/i] that uses the floating bus for syncing on all Spectrum ... -
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... 's the results from recent floating bus test 2, there were 2 ... -
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... you're experimenting with the floating bus sync now. Idk it's ... -
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... value will appear on the floating bus at which T state, but ... -
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Seems like reading from screen memory changes the floating bus value (or, maybe, not only reading, but also writing, and also from/to non-screen memory). -
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... from screen memory changes the floating bus value.[/quote]
Like [i ... -
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... from screen memory changes the floating bus value (or, maybe, not only ... -
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Well, it seems simple. Reading from screen memory leads to changing the value of internal ULA register, which is read from floating bus ports. Regardless of whether the screen memory is being read by processor or ULA. -
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Now we need to explore how screen (and non-screen) memory reading/writing by Z80 affects to floating bus. Maybe it depends from the sort of memory - fast and slow pages, and ROM pages. -
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Thank you. Now we are sure that in extended memory paging mode the floating bus is read exactly the same as in normal memory paging mode. -
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... mind helping. Understanding how this floating bus works though I'm afraid ... -
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... operations really influence to the floating bus value. (And, it looks like ... ROM page leads to changing floating bus value). -
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... code fetching, influences to the floating bus value. (And writing too, of ... -
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... have persisted, and cracked the floating bus mystery. I enjoyed helping you ... -
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... have persisted, and cracked the floating bus mystery. I enjoyed helping you ... -
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Or It still can be not quite exact emulation of the floating bus (but also related to the timings). -
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... of the display file), the bus retains the value that was ... operation code fetching) affects on floating bus too. So, (the value of ... of floating bus ports.
6. The main pattern of the floating bus reading ... -
Loadsa bullets on screen (silkworm)Did games like silkworm just draw everything to the screen or did they have complicated optimisations? and the types of games where sprites can occu…
... ). [i]Cobra[/i] uses the floating bus trick to sync to the ... -
ZX Spectrum +3 repairI have my first +3 here, and it needs repairs. Hoping someone here can help me out. When I power it on I get this screen with black and white line…
Like I mentioned in the floating bus thread, the Spectrum is a quantum computer. Can’t be absolutely sure about anything, and if you try to take any measurements—all bets are off. -
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…
Indeed. Tried Fuse, RVM, and SpecEmu. It’s all over the place.
Now you can understand my puzzlement and frustration with the floating bus mystery back in September. -
Space Invaders Emulator for the Spectrum 128/+2/+2A/+2B/+3My Space Invaders Emulator for the Spectrum 128/+2/+2A/+2B/+3 is now available for download from: [url="https://c.gmx.com/sizx@gmx.com/DVQXAXrLRl2d…
... the 16K), and uses the floating bus for syncing on all of ... -
Send in the ClonesPlease name all the Spectrum clones out there ( I would say I need it back on my desk in 5 minutes , but I will be a bit more generous in this case!…
... in simple terms what a 'floating bus' is? I read the Sinclair ... had always thought that a 'bus' was a term for a ... -
Some questions about the Timex TC2048/TC2068I have been doing some research about the specs of these 2 machines but I suppose it would be better to ask for advice in the forum since I have neve…
... ula attribute bytes on the floating bus, an example being Arkanoid. ... made the ts2068's expansion bus compatible with the zx81/ ... spectrum by changing the expansion bus to be compatible with ... the z80 cpu to recover floating bus behaviour (this is something ... -
Some questions about the Timex TC2048/TC2068I have been doing some research about the specs of these 2 machines but I suppose it would be better to ask for advice in the forum since I have neve…
... ula attribute bytes on the floating bus, an example being Arkanoid. ... made the ts2068's expansion bus compatible with the zx81/ ... spectrum by changing the expansion bus to be compatible with ... the z80 cpu to recover floating bus behaviour (this is something ...