... /> 0. The beginning of an interrupt. There has to be some ... delay routine. Cobra uses the floating bus reads but it can also ...

... /> 0. The beginning of an interrupt. There has to be some ... delay routine. Cobra uses the floating bus reads but it can also ... my current understanding of the floating bus :-D

[IMG]http ... .photobucket.com/albums/n608/daveyboyhughes/bus-1.jpg[/IMG]

... start of an interrupt anyway, don't use the floating bus - use a ...

... /> - Added precision emulation setting (floating bus, contention, interrupt timing)
- Added NTSC 48K ...

It's a floating bus issue. On Speccys where 'port # ... best done right after an interrupt to make sure the beam ...

... , and the frame length (interrupt-to-interrupt) is 59736 T-states long ... vsync interrupt
[*] The behaviour of IN from an unattached port ('floating bus ...

... vsync interrupt
[*] The behaviour of IN from an unattached port ('floating bus ...

... will not be able to interrupt the Z80 CPU.
Now ... will get the FF hex floating bus value unless the ULA is ...

... the video mode (so the floating-bus trick doesn't work). And ... the screen blank and the interrupt frequency (60Hz in the US ...

... you plan to leave the floating bus synchronization in like in the ... little more tricky for traditional interrupt-driven engines. All you need ... from the beginning of an interrupt.

[QUOTE=Metalbrain;739430]Using the floating bus, that method won't work ... at the begining of the interrupt and swap between normal and ...

... at the begining of the interrupt and swap between normal and ... routines).[/QUOTE]

The floating bus does not work on all ... looked at what kind of bus loading the 48k machine ... T state delay following an interrupt, possibly substituted by various fixed ...

... =Alcoholics Anonymous;739443]The floating bus does not work on all ... T state delay following an interrupt, possibly substituted by various ... of SP1. Yes, the floating bus is dirty and tricky but ... another 128k engine (without floating bus) and support the maximun ...

[QUOTE=antoniovillena;739518]Yes, the floating bus is dirty and tricky but ... whether you miss the next interrupt (and miss 50 fps) or ... little differently :- you halt for interrupt, you spend about 14k cycles ...

... (hl) and records after each interrupt the lowest bit of the ... #FF (no-one called it "floating bus" back then). I am sorry ...

...
2. Set the Interrupt Vector address:
Bit: ... interrupt and puts the interrupt
vector specified on the bus ... --------------------------------

Interrupt A (x direction) at ... depressed. Thus, the floating bus would cause these bits ...

...
2. Set the Interrupt Vector address:
Bit: ... interrupt and puts the interrupt
vector specified on the bus ... --------------------------------

Interrupt A (x direction) at ... depressed. Thus, the floating bus would cause these bits ...

... flashing via software from an interrupt, and you will know for ... it's internals? Like snow? floating bus?

... data present on the ULA bus, which will be a display ... from the beginning of an interrupt. This allows for better usage ... /the-sidewize-test-zx-spectrum-floating-bus-shenanigans/]Sidewize[/url] because I ...

... wait for the vertical blank interrupt, count cycles down to line ... number of games depend on floating bus behaviour. They will sit in ... time the ULA fires an interrupt signal once per frame. ... anything without tying into this interrupt and counting cycles? Or, ...

... just pause that amount after interrupt using a loop and the ... another game that uses the floating bus to synchronise the screen, causing ... Pentagon also does not exhibit floating bus behaviour, so this fix would ... . It checks for the floating bus and if it does not ...

... partly floating bus-related, but the actual issue here is interrupt skipping ... to the next, the interrupt that should occur in there ... mechanism in the form of floating bus reads. This improves the ... routines so that they're interrupt-friendly while doing more ...

... . Most important is probably the floating bus. Some spectrum games will try ... to read bytes from the floating bus to find out when the ... is the 50Hz vs 60Hz interrupt difference. You would think that ...

... 48K/128K; if there are bus-noisy peripherals connected, you' ... RAM, then after an interrupt comes temporarily set I to ... you're already using the floating bus. It's something similar or ... spot pointing 'close to' your interrupt routine, or just someplace you ...

... area will respond with a "floating bus" value (normally 255, but ... but may also occur during interrupt acknowledge when both /M1 and ... address on the address bus is the current contents of ... />
See Figure 11: Interrupt Acknowledge Timing in http://www ...

... /> I decided to keep the floating bus sync (and I do it ... use two syncs:
1) Interrupt to play audio. This one ... hit at 50hz
2) Floating bus to sync start of drawing ...

... /> I decided to keep the floating bus sync (and I do it ... use two syncs:
1) Interrupt to play audio. This one ... hit at 50hz
2) Floating bus to sync start of drawing ... less time before the following interrupt, but it would iron out ...

... .[/quote]
Right. Using the floating bus as a way of syncing ... emulator) which syncs to an interrupt. I have no control over ... , neither the quirky +2A/+3 bus behavior, nor the “standard” 48K ...

... we’ve tackled down the floating bus nitty-gritty on the +2A ... that, instead of a regular interrupt. You took it to the ...

... we’ve tackled down the floating bus nitty-gritty on the +2A ... that, instead of a regular interrupt. You took it to the ...