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Anyone help re-factoring a tile functionI had some excellent feedback for re-factoring my function that displays the colour for my screen tiles. Can anyone offer some help to improve the fu…
Thanks for that, I just spoted that one my self after searching the net for Z80 T-states. -
Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
I've got a TS2068, and would be interested in getting this number worked out for that machine, though looking at the source it seems I need to know the number of t-states before the first non-border cell first.
TBC -
Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... TC2048. In any case the T-states for the TC2068, TC2048 and ... what the effect on the T-states would be given that these ... -
Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... to know the number of t-states before the first non-border ... at the code!) so don't take it's results as ... -
Quickest Assembly to find if point in rectangleWhat is the fastest way to see if a point is in a rectangle. e.g rectangle is 10,10 100,10 100,40 10,40 how do i know if a point (e.g 20,20) is in…
... the loop, otherwise you won't elimate the last test.
instead of 20 T states, you use 13. -
Looking for rare TZX blocksBy rare I mean out of the hundreds of TZX I have non of the following blocks exist. I need to test my loading/handling/saving code. Are there any TZX…
Luca, standard data block pilot pulses is 3222 not 3223. Are you not adding the final extra pulse of 950 T states even though it isn't read? -
Looking for rare TZX blocksBy rare I mean out of the hundreds of TZX I have non of the following blocks exist. I need to test my loading/handling/saving code. Are there any TZX…
... a extra pulse of 950 T states.
The signal then fades ... a extra pulse of 950 T states.
The signal then fades ... -
How many T-states takes PUSH DE ?Hi. Just a quick one. According to z80.info docs, a PUSH DE should take 11 T-States to be executed. But WHAT if SP is pointing to Contended Memory,…
... ... AGAIN!
And I can't get an answer.
And ... "cycles" ? I was asking about T states ???
PUSH dd pc ... :3
This don't tell me nothing new, I ... +3=11 but 11 what T-states ? If T-states this is the normal ... -
Best method for sprite collision detectionHi, I have been trying to incorporate collision detection into a sprite routine I writing. The following is what I have come up with so far: POP D…
... can save a lot of T states if you use regular sprites ... -
IDE harddisk emulation usageNot 'howto' question :) I'm curious about how many people tried it. It exists in Spin, Fuse & RealSpec - in last is most interface supported. 8-bit …
... ]
Google... I don't know what is Google :)
t be true. You used INIR ... read, and it takes 21 T states (except last transfer - 1 of ... -
IDE harddisk emulation usageNot 'howto' question :) I'm curious about how many people tried it. It exists in Spin, Fuse & RealSpec - in last is most interface supported. 8-bit …
... ) are wrong. It simply can't be true. You used INIR ... read, and it takes 21 T states (except last transfer - 1 of ... at the most I can't see it makes much difference ... -
IDE harddisk emulation usageNot 'howto' question :) I'm curious about how many people tried it. It exists in Spin, Fuse & RealSpec - in last is most interface supported. 8-bit …
... ) are wrong. It simply can't be true. You used INIR ... read, and it takes 21 T states (except last transfer - 1 of ... -
IDE harddisk emulation usageNot 'howto' question :) I'm curious about how many people tried it. It exists in Spin, Fuse & RealSpec - in last is most interface supported. 8-bit …
... ) are wrong. It simply can't be true. You used INIR ... read, and it takes 21 T states (except last transfer - 1 of ... -
IDE harddisk emulation usageNot 'howto' question :) I'm curious about how many people tried it. It exists in Spin, Fuse & RealSpec - in last is most interface supported. 8-bit …
... />
Right, INI takes 16 T states. I probably looked into source ... -
Emulating the SamRAM on the ZX Spectrum SEGerton Lunter gave me permission to reuse the code, but so far I have not been able to get the software to work in paged RAM banks.
... -border byte is around 14321 t-states.
Some border effects ... line up (Aquaplane), some don't (Academy).
[1] I ... guess it shouldn't be too much of a ... -
Emulating the SamRAM on the ZX Spectrum SEGerton Lunter gave me permission to reuse the code, but so far I have not been able to get the software to work in paged RAM banks.
... possible, a production SE shouldn't include switchable CPU timing, cycles ... scanline length in 1/2 T-States, size of the top & ... -
Draft specs for TZX v1.20Hi all! In the attempt to restart the development of the TZX format, I've put online the first version of the draft document [1]. At the moment ther…
... to between 589 and 663 T-states on the ZX81 with a ... 3.25MHz clock. 637 T-states looks reasonable upto now.
states that all t-states should be calculated assuming ... 637 * (325/350), or 592 T-States?
MikeW -
Draft specs for TZX v1.20Hi all! In the attempt to restart the development of the TZX format, I've put online the first version of the draft document [1]. At the moment ther…
... pulse is ~637 T-states long)" - but I don't know how accurate ... of tzx specification it states that all t-states should be calculated assuming ... 637 * (325/350), or 592 T-States?
[/quote]
The ... -
Draft specs for TZX v1.20Hi all! In the attempt to restart the development of the TZX format, I've put online the first version of the draft document [1]. At the moment ther…
... /> - Each "double-pulse" is 975 T-states long, divided into two pulses ... pause.
I haven't considered any additional time for ... -
Draft specs for TZX v1.20Hi all! In the attempt to restart the development of the TZX format, I've put online the first version of the draft document [1]. At the moment ther…
... , but I've counted the T-states once again and the numbers ... /48000)*(59/4)=998.7 T-states at 3.25 MHz, which ... almost perfectly the theoretical 975 T-states desumed from the ROM routine ... -
Z80 cycle contentionHi, Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle? I mean which Z80 clock cycle, T1 or T2? Thanks..
... Ula timings..
after 14336 T-states from the interrupt pulse the ... this byte before, how many T-states before?
Z80 cycle contentionHi, Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle? I mean which Z80 clock cycle, T1 or T2? Thanks..
... timings..
after 14336 T-states from the interrupt pulse the ... this byte before, how many T-states before?
[/quote]
...
Don't forget that the timing is ... comes into play later (14366 t-states?).
Regarding the ...Pocket Clive - 2 QuestionsHello, I've just started using Pocket Clive on my iPaq pocket PC, excellent emulator BTW. 1. I have just wrote a small BASIC program to randomly pi…
... ' method undoubtedly uses up more T-states than the 'floating bus' probe ... the same genre (I haven't yet looked at the game ...Keyboard emulation accuracyWhen the IN function checks the keyboard how accurate is it in a real speccy? For example, say you had lightning fast hands and a keyboard that coul…
... than 11 T states. Basic command IN takes probably several thousands T states - there ... will be many T states between keypress or ...Convert x,y to Attribute Address in AssemblyWhat is the fastest way, given x,y (in hl) to return the attribute address?
Yeah, that'll do it nicely. Adds another 70+ T-States to the routine tho'. Personally I'm not a fan of using ROM routines unless I'm going for space-saving code, but that's just me.
Should give Rob a few ideas to try out anyway.Convert x,y to Attribute Address in AssemblyWhat is the fastest way, given x,y (in hl) to return the attribute address?
... want to save 30-odd t-states at the expense of a ...Method to read byte as binary string rather than dec?Hi all Am fiddling around with the screen buffer and have written a routine to scan the screenbuffer into upper ram and then write it back in upside…
... faster.[/quote]
Can't do that on a Spectrum ... data would take about 5000 T-States or so (clock cycles basically ...Method to read byte as binary string rather than dec?Hi all Am fiddling around with the screen buffer and have written a routine to scan the screenbuffer into upper ram and then write it back in upside…
... :32, cyborg wrote:
Can't do that on a Spectrum ... data would take about 5000 T-States or so (clock cycles basically ... /> The ZX has approx 70000 T-States per frame, but this depends ... would take about over 40000 T-States, and that's not taking ...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…
... , min, and average number of T-States it takes to pass through ...
