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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 ... -
Help with 1-bit sampled soundHi all, I've been sent over this way from the CPC Wiki forums as you guys may be able to help me more specifically with a programming query. Firstly…
... first draft and I haven't tried to compile anything yet ... 's around 8-10 T-states of operation in part-prepping the ... new value roughly every 31 T-States.
The sample ... around 7000 bytes per second, with two samples per byte, allowing reproduction ... -
Interface 1 - RS232 question.I am thinking about doing some Spectrum stuff based around the RS232 port used on the Interface 1. Has anyone had any joy doing this with an emulator…
... I am adding interrupt mode operation this week. Will publish ... time while maintaining normal Spectrum operation.
Still am ... i.e. out of 70k t-states per interrupt. That is approx. ... Note that even with background operation it is still faster then ... -
Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…
I don't think you can see the ... T states per an OUT perhaps, but notice that this happens once per 1208 T states ... OUT occurs once every 52 T states regardless of the tone frequency ... sound loop is not a multiple of 8, otherwise it would ... -
LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…
... cycle 3 will take 3 T-states to read the contents of ... ] gap in the ULA wait states before it can write to ... start either 7 or 8 T-states after M3: the Z80 must ... in the wait states, it will take 32 T-states per byte.
Using the stack to copy memory blocksA [b]PUSH[/b] and a [b]POP[/b] instruction together take less time than two [b]LDI[/b], so long [b]POP/PUSH[/b] sequences are sometimes used to copy …
... ld sp, ix ; 10 T
pop bc ; 10< ... ret
; Total = 148 T-states per iteration.[/code]
The ...
; Total = 138 T-states per iteration.[/code]
The ...Timing of Timex Computer 2068Is the timing of the Timex Computer 2068 fully documented yet? I have one here with the ZX Spectrum Emulator cartridge and have downloaded a few test…
... . There are 224 t-states per line and 312 lines per frame. The screen ... the data buses. I haven't checked if this is the ...Tinkering with DMASo, some afternoon tinkering... [img]http://photo.alioth.net/tmp/dma_small.jpg[/img] The purpose of this all is to see what's possible using the Xi…
... PUSH HL, which takes 11 T-states per two bytes.
With ... , this is reduced to 6 T-states per two bytes.
* ... memory timings would take 6 T-states per byte copied.
... which is something like 21 T-states per byte!
Also, ...Fixing a ZX Clone from .ru - 27 years late.Hi there, I've currently assembled another russian clone a "Compact 256 Turbo" from a PCB I bought. The machine appears to be fully functional and o…
... to be largely compatible (69888 T-States per INT, 295/312 Lines on ...ZX Spin 0.4 available for Download.Standard Cut-n-Paste from the CSS post: If all goes well, I'll upload it to WOS on monday. ----------------------------------------- Okay, it's th…
... are more interested in more T states per frame and hence less partially ... contended memory and processor wait states/clock halting.
Fraser ...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 POP ... 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 POP ... 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 instructions ...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 in ... would take about over 40000 T-States, and that's not taking ...another c64 vs. Speccy site...[url]http://c64vsspectrum.com/[/url] 25 years and we are still brawling.. ;)
... !)
There's 224 T-states per scanline, so by the rough ... envelope calculation, something like 7 T-states per 8 pixel long memory cell ... d have less that 1 T-state per memory read from screen ... cycle takes 3 T-states, and there wouldn't be 1 T-state to ...AY tracker routineHi. Yesterday i played with some ay tracks and was surprised how big are tracker routines and music data (over 1.5KB for Pro Tracker routine and 4-6 …
... and less than a thousand t-states per interrupt.
On the ...Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…
... convinced myself that it wouldn't work because the time measured ... we know the number of T-states per frame, then we can work ... know precisely how long a T-state is, given any arbitrary ...Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…
... convinced myself that it wouldn't work because the time measured ... we know the number of T-states per frame, then we can work ... know precisely how long a T-state is, given any arbitrary ...The So What's This Buzzsaw All About Then? Thread.Erm. This: [URL="http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap"]http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap[/URL] Keys…
... tested under Fuse. Doesn't affect gameplay though.[/QUOTE]
T-states to copy each line, allowing ... Pentagon version takes exactly 224 T-states per line, without contention.
< ... be difficult if I can't reproduce the problem under ...The So What's This Buzzsaw All About Then? Thread.Erm. This: [URL="http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap"]http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap[/URL] Keys…
... of the code with 219 T-States per line, somewhere betweeen the 48k ...Where's the border line between a Spectrum and something else?I mean: there are purists out there that consider that anything that is not a true Sinclair Spectrum, with a true Z80 and a true ULA, and at most, 48…
...
Even 128K models aren't 100% compatible with 16/48K ... , floating bus, fixed number of T-states per line/frame, etc.)
< ... a Spectrum clone and don't take into account those singularities ... , many games won't work or will "stutter". ...Best Spectrum game from 2009Ok, its almost 2010, and we have to decide which was the best game this year :) Miles Mad Mission [url]http://www.worldofspectrum.org/infoseekid.cg…
... frame rate, thus having 'more' T-States per interrupt (71680). So, the software ... (demos, modern games), simply can't work properly on anything else ... .[/QUOTE]
You obviously haven't seen any real demos for ...Spectrum 2-3 times more powerfull than MSX?![url]http://www.youtube.com/watch?v=2-kI0urN9tI#t=8m18s[/url]
... Hz smooth multiparallax scroll with per scanline attributes using little CPU ... has quite a lot less T-states per frame. That, along with the ..."Programming the Spectrum in Assembly" series in Micro MartI see that Shaun Bebbington is starting a series of articles in Micro Mart magazine on how to program in assembly for those who might know a little b…
... 50.08 Hz, giving 69888 T-states per frame; the 128K runs at ... at 50.01Hz, giving 70908 T-states per frame - so in real terms ... for Double Dragon, I don't know...Sprite MaskingI was looking at the sprites in some games, and noticed they have sprite followed by mask. Usually a row at a time (so the mask is sort of interleave…
... they have, and we don't.) :cry:
The basic ... , you'll consume 18 more T-states per iteration.
Now suppose ...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 ; 123.15 T-states per bit
bit ld ...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 ld ... is written to keep the T-states to a specific value thus ...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 ld ...
