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Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... you can work out the T-states and such :grin:
[/ ... This all checked with Spectaculators T state counter, no mental gymnastics ... that an assembly programmer wouldn't normally use. A switch ... images, but I don't know without seeing the difference ... -
Z80 Developer ConsoleHi, This is a project I have meaning to do for ages, recently had a kid, had some time off work (as a software developer) and surprisingly had a bit…
... 'd like would be a T-state counter, which would show ... the t-state for each line of ... if they could print out t-states for each line of code ... -
Z80 Developer ConsoleHi, This is a project I have meaning to do for ages, recently had a kid, had some time off work (as a software developer) and surprisingly had a bit…
... (intellisense, jump-mapping, labels, defines, t-states and all that other good ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... level within particular instruction T-states that are not measurable ... starts 2 T-states [I]before[/I] the contended memory T-states. See ... suggests why the usual documented T-states (contention start at 14335 ... - so the 6 T-states 14338-14343 experience memory ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... suggests why the usual documented T-states (contention start at 14335) ... samples the IRQ 3 states later after ULA pulls ... isn't it? I mean, the FAQ clearly states the contention ... contention starts 2 T-states before the contended memory T-states.[/QUOTE]
... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... waiting a precise number of T-states before changing the border colour ... />
[QUOTE]the FAQ clearly states the contention starts at 1 ... ULA requires at least 2 T-states to read the display and ... . So at least 3 contended T-states must pass before the first ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... out which of all four T states are contented and which not ... ? The first one can't be certainly contended by IO ... .
Now wait, wasn't the #7FFF supposed to be ... ? This is weird, isn't it? How would ULA know ... Isn't it more like that not all four states are ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... /> [QUOTE]The first one can't be certainly contended by IO ... are contended at the 2nd T-state
- Ports with A0 ... A0 is low, the 1st T-state is also contended, 3rd ... /> -If A0 is high, all T-states are contended
But ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... ]-If A0 is high, all T-states are contended[/QUOTE]
T states were contended, we would not ... pattern we can't tell anything about the 2 states after or ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... -If A0 is high, all T-states are contended
[/QUOTE ... the first and last T states were contended, we would ... can't tell anything about the 2 states after ... about the 2 uncontended states may be true, however ... to tell how may T-states are contended by counting ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... able to tell how may T-states are contended by counting the ... cycles. This doesn't tell us which T states were contended and by ... much, nor how many contended T states there are. Then we can ... the first and last contended T states, by running the instruction at ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... This doesn't tell us which T states were contended ... nor how many contended T states there are. Then we ... first and last contended T states, by running the instruction ... what happens for the states in between.[/QUOTE]
T-states of the IO part ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... QUOTE=csmith;213979]I don't know. I've always wanted ... , I talk about which T states of the IO/instruction are ... , I think we don't need to discuss this anymore ... you said, luckily it doesn't matter).
Edit: ... . No doubt you couldn't get what I was trying ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... also explain why it doesn't apply it during T3 and ... low at start of those T states (thus the snow effect) as ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... also explain why it doesn't apply it during T3 and ... low at start of those T states (thus the snow effect) as ... byte fetches because there won't be time for the instruction ... wonder if the timing isn't too sensitive.
If ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... least point out explicitly which T-states of the memory read/write ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... contention during the following two T states, but this extending is what ... I haven't got from the schematics (yes ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... least point out explicitly which T-states of the memory read/ ... and 128k, the only instruction T states which are not contended are ... and M3 cycles, all other T states are not contended (the ... case of any extra inserted T states the contention happens according to ... -
Can you write in the border?Is it at all technically possible in any way to get stuff into the border, apart from changing the border colour? I believe the C64 used the border a…
... , which take 11 and 12 T-states respectively. In the upper border ... pixels) is painted in 4 T-states, and on a regular Spectrum ... a one-off; you couldn't do that repeatedly to build ... a complete picture). I don't think anyone's ever attempted ... -
ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…
The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…
... is that the chip won't need to be memory mapped ... take the same number of T-states as LDIR.
[/QUOTE]
The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…
... reference code. Which doesn't actually use auto increment ... incremented when it shouldn't - but only during reads ... is many many more T-states than an INIR instruction!< ... in less than 50 T-states on average - at ... eat up 30-odd T-states including the c register ...Problem with replacing all upper memory with 4164 chipsGuys, i have a problem with the high memory of a 4B issue. At first the board had OKI chips for high memory and one of them was faulty. Since its ea…
... Z80 goes low for one T-state (the falling edge of ... full memory write is 3 T-states) which will be 285ns. /RD ... goes active for longer (2 T-states), but the actual important time ... , which is probably only 1 T-state. (Someone who's familiar ...Detecting a Kempton joystick...I've been playing with the idea in the games I'm currently developing so that once the Kempston joystick has been selected you can hold FIRE down to …
... my stuff, unless you can't enable ints for some reason ... screen/attr bytes.
; (~14k t-states on 48k). Normal Spectrum ROM ...Bizarre stuff in Interface 1's shadow ROMAccording to the Complete Shadow ROM disassembly, the function that exits back to the BASIC interpreter after interpreting IF1 commands is this: [co…
... I missing? I just can't see any point however hard ... instruction. It just wastes 7 T-states as far as I can ...Bizarre stuff in Interface 1's shadow ROMAccording to the Complete Shadow ROM disassembly, the function that exits back to the BASIC interpreter after interpreting IF1 commands is this: [co…
... =Winston;250720] I just can't see any point however hard ... instruction. It just wastes 7 T-states as far as I can ... the solution, i don;t think 7 t-states would concern the authors ... ...afterall it isn't time dependantEmulators on the ZX SpectrumHaving released a Spectrum 16K emulator for Spectrum 48/128 machines as part of CCG2008, I was wondering if anybody knows of any emulators which actu…
... * crap. As the VIC doesn't have SID sound and sprites ... /> ...which takes a horrible 38 T-states, but I have freed up ...Emulators on the ZX SpectrumHaving released a Spectrum 16K emulator for Spectrum 48/128 machines as part of CCG2008, I was wondering if anybody knows of any emulators which actu…
... /> ...which takes a horrible 38 T-states, but I have freed up ... maincommands are reached in 26T states.
(my first emulator reached ... every code in 52T states)
After executing a ...How many expansions can a Speccy handle ?How many expansions / interfaces / addons can a Speccy handle ? I'm not thinking about the issue of powering the interfaces through the Speccy's PS…
... takes the same number of T-states regardless of the number of ... , the Spectrum's design doesn't allow for more without a ...Disappearing/appearing effectI remember doing a small routine in BASIC which could be used to cover the attributes section randomly, until all 704 characters were filled with the…
... for faster indexing. And don't use the index registers. Ever ... two versions take the same T-States.
I am using ... />
I will do a T-State count to see if ...
