... of tests to check the contention values I added to our ... were built to check the timing though I quickly found the ... to check for "early/late" timing to find some late machines ... theres an option for late timing tick it and run again ...

... the quality of sound (perfect timing)[/QUOTE]

I *think ... only place I run into contention is when writing to screen ...

... br />
If contention did increase, then either the ... go two ways: increased contention or decreased contention.

... altered contention behaviour is the reliance on the timing of ... this signal timing would be affected, altering contention. Again it ...

... is the comments about the timing being off compared to SPIN ... i spoke about spin, although timing is fairly accurate many of ... speed. Maybe its an inaccurate contention issue, maybe IY or IX ...

... many as needed/possible given timing constraints:
2 bytes: address ... , but 8 down (subject to timing constraints).

I have ... it would fit around the contention of the Z80/ULA or ...

... ULA didn't apply enough contention to IO instructions, which ... use the more conservative memory contention model instead of the ... ).

To maintain timing compatibility, the later ULA versions ... instead of the intended IO contention model, and so the ...

... will have less than perfect timing if run on the +2A ... probably need to support both contention models and make them switchable ...

... the +2A (no I/O contention). But basically I'd avoid ... joystick/keyboard read during the timing critical stuff.

... will continue to do that! contention is evil, ULA is evil ... ]
In actual fact, the contention helps a great deal when ... get your timing accurate to around 90% and the contention will automatically ...

Yes, I read about memory contention, but I didn't even ... programs/games/demos where precise timing is crucial and I even ...

... core and there the T80 timing issues come out. In fact ... a look at the signals timing (in particular) to the IORQ ... 't related to the T80 timing issues: I say that because ... /> - Ulatest3
- BTime
- IR-Contention
- Shock megademo
- No ...

... used to add proper memory contention support to SimCoupe :)

timing and flags affected.[/quote]

... developer would have noticed the timing was wrong when coding, and ... /> My advice, make the bank contention model switchable - either a jumper ...

... /> Any emulator that does accurate contention will emulate that perfectly well ... using? Note that late timing or early timing settings in the emulator ...

... ]Any emulator that does accurate contention will emulate that perfectly well ... using? Note that late timing or early timing settings in the emulator ...

[QUOTE=Arjun;589491]Ooh! Shiny! Does this have the new ULA Plus timing that Andrew was working on?[/QUOTE]

I don't have special contention timings for ULAPlus. JSpeccy applies the appropiate contention for the ports used, and nothing more.

... at 21 T-states (plus contention, so 24T a lot of ... it easy to see the timing for single instructions or complete ...

... . So unless you calculate the timing of every other bit of ... /misc/timingtest-0.2.zip"]timing test[/URL] which I have ... #post215794"]this thread[/URL] about contention.

Once you know ...

... has no memory contention, is this interface removes contention of +2? ... is ULA with different screen timing, then show multicolor effects ... disable(off), then CPU timing is 100% compatible with ... original ZX128/+2 timing and ram pages higher than ...

... [B]Fikee[/B] has linked, timing varies between 48K, 128K, +2A ... a Pentagon (which has no contention) or a real Speccy. Then ...

... that I've lost the timing in the second row down ... -2 tstates. And due to contention, the sync will be lost ...

...
Machine type: +3
Contention offset: 0x08

BIT ... memory... passed
High port contention 1... passed
High port ... contention 2... passed
0x3ffd read... ... it my +3 a "late timing" exemplar then?

... screen:
[INDENT]
[...]
Contention offset: 0x08
[...]
[/INDENT ... regard that as an "early timing" machine. I guess the test ... various emulators with early/late timing settings and see what they ...

... " mode?
[/QUOTE]

Contention offset is 0x08 in Spectaculator ... in both late and early timing modes for the +3.

... Windows) configured for non-late timing: 1+3 only
[*] ... (for Windows) configured for late timing: 2+3 only
[*] ... /2012 configured for non-late timing: 1+4 only
[*] ... memory contention properly, so I doubt it emulates interrupts and border timing ...

... emulators with early/late timing settings and see what ... here[/URL]) to measure "contention offset" on a few emulators ... 1.0a: complains about "negative contention" :)
[/LIST]
... measure contention properly, and Spectrum +3 with late timing actually ...

... here[/URL]) to measure "contention offset" on a few emulators ... measure contention properly, and Spectrum +3 with late timing actually ... 3 are always non-late timing, but emulators don't ... confident about fusetest's contention measurements than about emulators ...

... there are no "early timing" and "late timing" Spectrum +3, but ... have correct timing for memory contention but wrong timing for border ... behave according to "early timing" Spectrum +3 settings in ... but border according to "late timing" Spectrum +3 settings in ...

... emulators have correct timing for memory contention but wrong timing for border only ... would behave according to "early timing" Spectrum +3 settings in emulators ... , but border according to "late timing" Spectrum +3 settings in emulators ...

... up all the sub-instruction timing and contention to get the colour ... their own fit amongst the contention by trial and error. It ... the downside - there's no contention!

It doesn't ...