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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,…
... PUSH DE should take 11 T-States to be executed.
T states looks OK, but shouldn't it take longer ... interrupts disabled but that shouldn't change the fact that the ... />
I think this 11 T states info is normal situation and ... -
Scrolling loader counter in 85 T-States?Would it be possible to write a scrolling loader counter in 85 T-States? I have a custom screen load routine that loads attribute first, then the …
... scrolling loader counter in 85 T-States?
I have a ... scrolling load counter in 85 t-states. Should be possible to update ... stack useage. My loader doesn't touch the stack, no calls ... -
ZX-Modules app reportZX-Modules app report If You are interested, I want to report about the state and progress about my ZX-Modules programs. I would like to report at l…
... /> if you want to pre calculate you could set a max ... is: I cannot count the t-states in such cases - except if ... real emulator. An emulator can calculate t-states easily.
Besides of ... -
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…
... ought to land (well, also calculate where the circular buffer wraps ... is that the chip won't need to be memory mapped ... take the same number of T-states as LDIR.
I ... -
Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…
... starts always at the same T-state (related to the moment ... to last a number of T-states which is a multiple of ... portion of instructions that aren't HALT last a number of ... -
line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
Timing through intrupt isn't the option. Calculate the number of T states for plotting your point. I haven't found a faster plot yet (see also my new topic). -
Fake screenshots? No - now it's REAL screenshotsOk then. A few weeks ago I said I will show You the new gfx-mode of Speccy and - here it is: [url="http://republika.pl/hooy_prg/hprg.zip"]http://rep…
... it will take around 100000 T-States to copy a screen ... things those, i don't know why programs have those ...
okay. i wasn't disputing that, i only spoke ... ! Geeeeez ) you don't even imagine how many coders ... nice if it could calculate and divide the darker ... -
CSW 2Have you been using csw 2 yet? I find the total pulses is sometimes wrong by 256 too short. Also there is a small shift to the right by a few sampl…
... point in time, I don't know what to ask for ... , when you mention T-States that we could calculate the correct timmings. So ... -
help with sprites from SevenUpHas anybody got source for a short m/c rountine that can send sprites designed in SevenUp to the screen or to a dummy screen? A long time ago, I wor…
... horizontal coordinates. You probably won't understand the text, but the ... their size and time in T-states.
[url="http://www ... need is a routine to calculate the next scanline, such as ... -
Determining 50hz/60hz in softwareHow can you determine in software if you are running at 50hz or 60hz?
I don't think that given code with ... give correct value. May calculate timings by exact T-states, or just run ... -
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…
... more. This version doesn't change the overhead (still ... />
; enter with HL = t-states to wait
; Pre-req ... ; this overhead is used to calculate the remainder of
; ... lp1 ; 10
; now calculate the remainder (should be 16 ... -
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 ... br /> ; it is used to calculate the remainder of the subtracts ... , .lp1 ; 10
; now calculate the remainder (should be 16 ... -
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 ... change, calculate the from and to positions based on the T States since ... -
Brand new River Raid remake?one of my friend is trying to make a riverraid remake on flash just to have fun, I checked zx spectrum port of river raid. it is bad, really bad, jer…
... 'm doubting whether the 224 T-states in one line is enough ... 7 lines. Well, [I]16-T-states-for-a-2-byte-write ... , so no time to actually calculate the necessary values... -
Audio Output Filtering in EmulatorsI am messing around with various beeper-related code at the moment and have a question related to the audio output from emulators... I've written s…
... to 79/2 = 39.5 T states in time and this will ... the most correct way to calculate the 44.1kHz samples would ... real spectrum as I don't hear complaints from the like ... -
testing if speccy is fully functionalHi, There is so much mention of T states but still confused. Does this mean if an instructin is out by a T-state or more then the speccy is faulty?…
... :-)
A T-state is one clock tick ... in the same number of T-states, it is not temperature ... The only thing you can calculate a CRC on is data ... br />
If you calculate the CRC for the ROM ... if you inserted 5 wait states into every instruction cycle, ... -
Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... /> ld e,8 ; 92.36 T-states per bit
bit ... data:
[code]
; Calculate CRC.
; > ... -
Which Speccy game had best border effectsIn truth, I'm just trying to remember a game from my youth, and the amazing border effect during pause is the only thing I can clearly recall about i…
... time every frame, which isn't as easy as you might ... . multiples of 4 T-states. So unless you calculate the timing of every ... to be a 1-3 T-State delay before your routine ... -
Which Speccy game had best border effectsIn truth, I'm just trying to remember a game from my youth, and the amazing border effect during pause is the only thing I can clearly recall about i…
... time every frame, which isn't as easy as you might ... . multiples of 4 T-states. So unless you calculate the timing of every ... to be a 1-3 T-State delay before your routine ... -
Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …
... the sprite. Another one to calculate off-screen the current sprite ... CPU-consuming routine is the calculate-rotate sprite. So, my ... from 1 to N
- Calculate (rotate) the sprite that will ... is that looking at the T-States and memory involved might lead ... -
Which Speccy game had best border effectsIn truth, I'm just trying to remember a game from my youth, and the amazing border effect during pause is the only thing I can clearly recall about i…
... time every frame, which isn't as easy as you might ... . multiples of 4 T-states. So unless you calculate the timing of every ... need, run at particular T cycle, with T cycle accuracy. See the ... worldofspectrum.org/forums/showthread.php?t=17551&page=10#post215794 ... -
BIFROST* Advanced Programming - part 6The purpose of this demo is somewhat different from previous ones. Instead of teaching a new technique, the main goal here is to demonstrate how much…
... [*]Frame 1: Check keys, erase, calculate new position and redraw player ...
[*]Frame 2: Erase, calculate new position and redraw enemy ... [*]Frame 1: Check keys, erase, calculate new position and redraw player ... , thus saving another 1K T-states per frame. -
How to benchmark a single routine?I've written a routine. It works. But it was never meant to be the final version. So I rewrote it. The new routine works too. Yay. :) However, I'd …
... executed 3.5 million times, T-states become seconds.
Don ... 't count on this method to ... method is to look up T-states for individual instructions, check how ... a loop executes etc, and calculate a grand total. Cumbersome but ... -
Fastest redraw of screen from UDGsHere's a question for everyone, to generate a bit of code to be used in games: On a standard 48K Spectrum, what's the fastest way to redraw the scre…
... you will probably need to calculate timing for the worst case ... byte and at least 2 T-states on every UDG. Are these ... good solution if you don't have too many "sprites" on ... -
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... , I noticed that it didn't work with Fuse's automatic ... , with a resolution of 26 T-states:
[CODE]
lp: inc ... /> [/CODE]
I don't think you can go faster ... gets you down to 22 T-states, but eats memory. Beware sneaky ... -
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... I noticed that it didn't work with Fuse's automatic ... , with a resolution of 26 T-states:
[CODE]
lp: ... to you (it wasn't to me until I realized ... the loop, then didn't bother until the next edge ... address left in HL to calculate how many reads you did ... -
Machine code optimisationI'm geting back into z80 coding and wonder what the best way of showing how efficient the code is. I've got Rodney Zaks book and see there are timin…
... bytes) and time (in T-states) for all instructions (although I ... don't recall anymore as many ... to know exactly how many T-states the code will take, ... , I created spreadsheets that calculate execution times for certain instructions ... -
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... AY programming, so I can't comment with any authority; but ... with an equivalent number of T-states' worth of OUT instructions.
calculate, so it'd be best ...
