... comes to the mechanics and getting your timing right, but Chuckie Egg ... is killer mode every second and quick decisions is needed, boh ... to victory on Youtube vid and another forum, wheras here on ...

... equipment to wear, and using counter moves to ... useful counter move and getting the timing right on it ... /> The counter works good, and with those 2 collars takes ... up the Disco and try and complete those mini ... finish the game off and start playing something ...

... useful to monitor the address and control buses.

... reset time, the address and data bus go to a high-impedance ... state, and all control output signals ... br />
Resistor R31 (220k) and C27 (1uF) provide a power ...

... matter of choosing some colours and using them - there are ... attributes) specifically for it and code that properly deals with ... dead wrong. You need vertical and horizontal counters, shifters, clipping, ... that the cpu core and zx bus have priority access to ...

... + anymore. Andrew did some and a few people experimented with ... improve [i]new[/i] software and the improvement would be significant ... with backgrounds, etc.[/quote]
And this means - the hw sprite ... such that the cpu core and zx bus have priority access to ...

Both the +3 and +2A/B (i.e. the ... not necessarily ideal from a contention point of view. Indeed, compared ... routines in memory since memory contention (and thus the speed your code ... the "old" 128s and the +2A/+3 and that the older 128 ...

... would ruin all the careful timing and sprites would start to tear ... the interrupts for checking controls and moving the player at ... around at an increased speed and the game becomes unplayable ( ... update the live display, and use clever timing to hide the changes ...

... handshake of any kind. And the all timing is a repeating fixed ... ULA generates the memory address and accesses the first byte that ... . The whole cycle repeats over and over again.

So ... the ULA), and your program has the exact right timing, it can ...

... than those in issue 1 and issue 2 boards.
... worthwhile testing the address and data bus. Both to test for ... open circuits and for short ... 35), /CAS (pin 1) and /DRAMWE (pin 4). Next data ... that I listed above and every destination that is ...

Makes no difference. I’m testing a floating bus hypothesis, which has been . . . uh . . . floating around. ;)

Forget ZEsarUX behaviour with floating bus port on +2A, it does ... has, some kind of a floating bus, but I still don't ...

... Iraq[/i] that uses the floating bus for syncing on all Spectrum ...

Thank you, @richl! You have just successfully beta tested the first Spectrum game to use the floating bus for synchronization on a +2A/+3. I’ll post more when I get home.

I suppose, it's need to test floating bus with extended memory paging modes of +2A/+3, for full information.

... 's the results from recent floating bus test 2, there were 2 ...

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.

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.

... influence of memory operations to floating bus probably concerns "slow" memory pages ...

... influence of memory operations to floating bus probably concerns "slow" memory pages ...

... } ) OR 1 {as usual for floating bus reading}

Looks like we solved all the mysteries of the +2A/+3 floating bus. Thanks so much to all participants of the exploration! :)

[quote="weiv;921830"]Looks like we solved all the mysteries of the +2A/+3 floating bus. Thanks so much to all participants of the exploration! :)[/quote]

Indeed! Thanks to all! :)

Or It still can be not quite exact emulation of the floating bus (but also related to the timings).

... quite exact emulation of the floating bus (but also related to the ...

... we’ve tackled down the floating bus nitty-gritty on the +2A ...

... , or was that only a floating bus test aid?

Here ... ;action=defaultclick"]the +2A/+3 floating bus version of SpecEmu[/url], as ...

... /> If the address, control and data bus are okay, give the CPU ... a clock and a ROM chip, and ...

[code]
ld a,(2899) ;+2A/+3 ROMs return 126
cp 126
jr z,its_a_plus
[/code]

That’s how I did it in [i]A Yankee in Iraq[/i] to handle the floating bus sync differently on these machines.

... ;930186"]since it uses the floating bus to synchronize[/quote]
I ... to fix in situ. The floating bus synchronization for the +2A/+3 ... handle both types of the floating bus. There’s plenty of time ...

... buses, or a train and a bus, and get back to Bristol in ... hour. It took me two and half hours to get back ...