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InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... cycle description says that 2 T states are added to M1 to ... acknowledge cycle. It states that two wait states are automatically inserted to ... settle) + 2 automatically inserted wait states during which time /IORQ is ... br />
Now, I don't know why it's not ... -
Collision DetectionHi everyone, This is my first post on WOS. Like most people here I owned a Spectrum when a teenager. At that time I was quite heavily into programmin…
... /> *
* TIMING: worst case 3745 t-states for no collision.
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Speccy AY versus 64 SIDWhich is best?
hahahahahhahahahahaha!!!! :)
it was good one.
anyway I ment (this time ;) ) rather sound of SID.
anyway, doesn't matter. 48K sound still rulez.I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…
... opcode takes a number of T-States to complete. Keep a counter ... explaining to me what T and M states are? I think I ...Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... might suck up too many T states -- you'll want to put ...On 48k, can I copy 4k before next screen updateFollowing on from my thread at [url="http://www.worldofspectrum.org/forums/viewtopic.php?topic=6423&forum=11"]http://www.worldofspectrum.org/forums/v…
... bytes gets copied in 51200 T states which is < the 68xxx ... to 20% longer or ~61440 T but this is something you ... Spectaculator reports the number of T states since the last interrupt -- set ... interrupt. There are about 14000 T states spent by the ula drawing ...Wanted: Code to wait until Border has been drawnWhen my IM2 interrupt fires, I want to wait until the ULA is past the first line of display before drawing. I know I need to wait about 14300T after…
... this. I prefer the counting T states method, but make use of ... lot of things in 14000 T states. The jitter between machines doesn ... even if jitter is 200 T states. If doing multicolour effects, you ... machines in the number of T states spent in the top border ...TZX and the ZX81Evenin All. EightyOne is now is a state where I can support a more descriptive tape format. I know how some people have been calling for tzx suppor…
... Length of a Pulse in T-States
06 2 Length of ... the last byte (I don't think anything ever put out ... data it encodes isn't. The ZX80 doesn't put out any ...RZX for Sabre WulfI was just about to send an RZX for Sabre Wulf to the RZX Archive when I noticed they don't accept Ultimate's (and other companies' who haven't given…
... when I noticed they don't accept Ultimate's (and ... other companies' who haven't given permission) files.
[/ ... between those companies which haven't given permission (most of them ... with some additional stuff like T-states.
[/quote]
...Cobra - scrollingHi everyone, I have been studying some of the code in Ocean' Cobra game using a debugger, in the hope of improving my own scrolling routines. In cas…
You mean it is so fast that they actually had to slow it down by 70000 T-states???!!! yikes!Cobra - scrollingHi everyone, I have been studying some of the code in Ocean' Cobra game using a debugger, in the hope of improving my own scrolling routines. In cas…
Judging by the quoted number of T States it's probably a routine to wait for screen sync.How can I see how long it took for IM2 to runHow can i see how many cycles it took for my interrupt routine to run, is there some way with Spectaculator debugger etc to see how long it has taken…
Assuming the debugger has breakpoints and T-States set a breakpoint at the start and end of the IM2 vector - the difference in T-States will give you the number of cycles it took to complete.Sprites flickeringI am trying to write a Spectrum game in machine code. I am still a beginner in programming, however I did much progress recently, i believe. Now I am…
... for the correct number of t-states, or by performing another task ...Z80 register decoding document error?Hi, I've been working on a disassembler using the following document written by Cristian Dinu (aka GOC?). [url="http://www.z80.info/decoding.htm…
... nothing. If the difference isn't obvious, think about interrupts.
t affect anything). After the optional ... instruction that takes 4 more t-states.
Actually, even a ... 'x-state NOP' notation isn't 100% accurate, seeing as how ...SPIN betaHello. This is my first message in this Forum, so excuse my bad english as it is not my main language. I would be extremely grateful if somebody cou…
... and change the model to 48k+ . The game works perfectly ... properly either. It also doesn't have 48K+ emulation so there is ... with Emuzwin, which also lacks 48k+ emulation.
And ... I thought the difference between 48K and 48k+ were purely cosmetic. :(new release of winTZXHi all I released winTZX 0.4drc1 (04/02/2005) + Added CSW file support + Added block selection (replay and save) + Added reverse output + Added direc…
... with it.
The T states for a pilot pulse is ...Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…
... the code again I can't actually see any reason for ... /POP DE and save 21 T States.
[ This Message was ...Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…
... L
saving another 4 T-states per run.
The ... 16 * 8 * 4 - 8 * 4 T States
Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…
... L
saving another 4 T-states per run.
The ... 16 * 8 * 4 - 8 * 4 T States
[/quote]
I haven't tested the code, but HL ...Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…
... save a significant number of T-States per cycle (given that indexing ...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…
... ). I think that takes less T states. The transition between screen thirds ...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…
SET 4,B = 8 T-states
LD B,16 = 7 T-states
See for timing
[url="http://www.z80.info/z80flag.htm"]http://www.z80.info/z80flag.htm[/url]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.
TBCInterrupt 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 ...
