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Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... even more. This version doesn't change the overhead (still HL ...
; enter with HL = t-states to wait
; Pre-req ... above bit of code won't fit.
ALIGN 16
How does interrupts work?I am a little confused regarding the interrupts on the Spectrum. If I have some hundred bytes of machine code started with, say, [B]RANDOMIZE USR 300…
... /> Is it known how many t-states in one second that is ...How does interrupts work?I am a little confused regarding the interrupts on the Spectrum. If I have some hundred bytes of machine code started with, say, [B]RANDOMIZE USR 300…
... /> Is it known how many t-states in one second that is ...Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... 41 bytes and with 93 T cycles overhead (assuming I computed ... accounting for the extra odd t-states, which is where the table ...Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... takes 17), but that doesn't make for a very usable ...
; enter with HL = t-states to wait
; Pre-req ...Border emulationHow is the border emulated to do all the fancy little tricks such as in Aquaplane? I've got some basic border emulation working but it only displays…
... />
Keep count of your T-States with each Z80 instruction and ... to positions based on the T States since the last INTterrupt. Obviously ...Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... possible to reduce the minimal T-states. My program has a shortest ... run of 54 T-states, with CALL, RET and NOP ... added it becomes 89 T-states
[code]
org ...Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... possible to reduce the minimal T-states. My program has a shortest ... run of 54 T-states, with CALL, RET and NOP ... added it becomes 89 T-states[/QUOTE]
Are you ... , i.e. 76 T without CALL, 93 T with it. And although ...A new Apple 1 emulator for the SpectrumHi all, I'm happy to announce a new Apple 1 emulator for the Sinclair ZX Spectrum! It's a port of Simon Owen's Apple 1 emulator for the SAM coupe to…
... noticed a remark about reducing T-states in the main loop.
T-states.
When B is constant ... code
in 26/36 T-states.
INC DE not ... mainloop, since this will cost T-states when your emulated code
Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... /> ; bit0 set : 20 T
; bit0 reset : 19 T
.b1 ... /> ; bit3 set : 24 T
; bit3 reset : 16 T
.b4a ... *b2 + 8*b3 + 16*b4 T states
And we have ... loop takes 11+32*n T states, working off 32T for bits ...I'll name that game in ...I was about to recommend Astro Blaster to someone, when I realised it's not the game I thought it was. Astro Blaster appears to be a space invaders …
... a way that every 500 T-states the sound routine was invoked ... silly message). And it wasn't done for 'Crash'. This version ... some other. This version doesn't have any credits or an ... ) and Mike Webb (who isn't) wrote it. Not me.Preferred way of determining Y co-ord in assembly?I know of 2 ways of calculating the y-cord of a pixel row for the speccy in assembly. One is to calculate the address by ways of shifting and masking…
... the Min Size version (83 T States; no table) as although I ...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…
ok, I don't know why I didn't think of timing this ... scroll_isr() interrupt routine. Specataculator reports T states since the interrupt occurred (therefore ... 0 on interrupt) so the T state reading in Spectaculator's ...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…
... the memopd aswell. I don't have memopd in my tree ... the code later. I can't really see much of a ... you can work out the T-states and such :grin:
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 ...
