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What should your speccy have come with ?:) I was thinking about this earlier. What changes should of been made to the Speccy when you purchased yours ? Realistically this topic really…
... , unless the programmer knew their t-states intimately (I'm looking at ... -
HELP!I'm trying to replace a bit in a byte as follows, but having some sort of brain freeze trying to get it to do what I want. A=00 if bit to replace …
... . And all this in 29 t-states. Not bad. Not bad at ... -
HELP!I'm trying to replace a bit in a byte as follows, but having some sort of brain freeze trying to get it to do what I want. A=00 if bit to replace …
... . And all this in 29 t-states. Not bad. Not bad at ... -
HELP!I'm trying to replace a bit in a byte as follows, but having some sort of brain freeze trying to get it to do what I want. A=00 if bit to replace …
And if you align your sprite data (i.e. make sure it doesn’t cross the 256-byte boundary), you can use INC L instead of INC HL, which is two T states faster. -
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 …
... only possible in about 180 t-states.
I'm now ... -
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 …
... longest route down to 122 t-states, with printing the whole counter ... get it to under 85 t-states if I store only the ... x rra, then I don't need to mask off the ... , printing in two passes. Saving t-states and memory. -
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 …
... the counter down to 85 t-states. Storing the bytes to be ... -
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 …
[quote="FrankT;897326"]I've got the printing of the counter down to 85 t-states[/quote]
Congratulations! -
New Game: A Yankee in Iraq (2017). A shoot-em-up.Last year, I [url="https://www.worldofspectrum.org/forums/discussion/53207/new-game-2016-revival-a-yankee-in-iraq-1992"]resurrected my old shoot-em-u…
... . I might sacrifice a few T states for that.
[quote ... -
c64 .sid player coming soon to specy 128!!!c64 .sid player coming soon to specy 128!!! the first old version uses only square waves, 4 years ago: https://www.youtube.com/watch?v=6CKt9noxA7s…
... very small difference of 7 T states. YMMV but personally I think ... this sort of tradeoff isn't worth it to keep 2 ... -
z80 Helper?When you are programming with z80 do you get 'lost' you are in the middle of making a routine and you can't remember which registers are holding val…
... /> looking at the t-states
Pushing HL takes 11 t-states whereas
t-states
so Pushing is ... -
z80 Helper?When you are programming with z80 do you get 'lost' you are in the middle of making a routine and you can't remember which registers are holding val…
... at the t-states
Pushing HL takes 11 t-states whereas
t-states
so ... in stack order. Don't forget PUSHing saves two bytes ... temporaries. But you don't just use it, you ... structures where code can't be written to walk ... -
ZXSCLZF - Yet another Screen CompressorQuick disclaimer before I continue, this compressor does not shrink screens as small as some of the others posted here, in particular the very good z…
... below at 111bytes. I didn't use the ixl/h modification ... /> It takes 1,275,473 t-states to decompress the full screen ... -
Can emulators run 'accelerated' like Spectrum NextI saw a video of the Spectrum Next running games in 'accelerated' mode (7Hz) -- Hard Drivin' was one of the examples. This gave a smoother framerate …
JSpeccy can play the games up to x10 faster, but it meets the Spectrum behaviour, one interrupt every 69888 (or 70908) t-states. Could be possible to generate one int every N frames, but not all games tolerate these behaviour. -
Can emulators run 'accelerated' like Spectrum NextI saw a video of the Spectrum Next running games in 'accelerated' mode (7Hz) -- Hard Drivin' was one of the examples. This gave a smoother framerate …
ZEsarUX allows setting turbo modes, found on Next and zxuno, which increases t-states per frame. And also allows changing overall emulation speed, which affects all the emulator (also interrupts and sound frequency) -
128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…
... normally runs in under 14K T states (roughly the time it takes ... CALLs (a 'main loop') wouldn't significantly suffer from these effects ... ; an occassional PUSH/POP woudln't hurt. -
128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…
... />
11,751 x 6 T-states for INC BC instructions equates ... to around 70,500 T-states so that looks about right ... -
off screen bufferwhen using an offscreen buffer is the memory copied to the screen in a way that makes it easier to draw sprites to the buffer? E.g. Lets say you…
... /> [/quote]
You don’t need to PUSH and POP ... ]. That way you save 21 T states per loop iteration.
t need to reset the position ... of the sprite. You won’t benefit from LDI when drawing ... -
What exactly is a Spectrum NEXT going to achieve?I've seen some Youtube videos on the Spectrum Next and i'm not seeing what it is being made for? I can see the bonus is that it will make existing ga…
... /> However, some games that count T-States in order to maintain their ... -
What exactly is a Spectrum NEXT going to achieve?I've seen some Youtube videos on the Spectrum Next and i'm not seeing what it is being made for? I can see the bonus is that it will make existing ga…
... to give 140k/280k/560k T-states per frame, instead of 70k ... -
What exactly is a Spectrum NEXT going to achieve?I've seen some Youtube videos on the Spectrum Next and i'm not seeing what it is being made for? I can see the bonus is that it will make existing ga…
... /> However, some games that count T-States in order to maintain their ... if turbo mode means more T-states per frame, or more frequent ... -
Is there a AY C64 Delta loading music changer type programme?Rob Hubbard came up with a genius idea of having the DELTA loading screen where you could change it yourself (The lead,Bass, Drums and FX)and I was w…
... fixed intervals of about 350 T states. Not a small feat by ... -
Interrupts, 16k Spectrums and snowI'm writing something for the 16k Spectrum and I want to use interrupts. The avilable documentation doesn't seem clear enough for me to figure out ho…
... sides too) where contention isn't an issue.[/quote]
I ... fluctuations up to about 12K T states, as well as maybe help ... -
Interrupts, 16k Spectrums and snowI'm writing something for the 16k Spectrum and I want to use interrupts. The avilable documentation doesn't seem clear enough for me to figure out ho…
... .. that's interesting. I hadn't though of doing that. Does ... (give or take a few t-states) when I sync.
Interrupts, 16k Spectrums and snowI'm writing something for the 16k Spectrum and I want to use interrupts. The avilable documentation doesn't seem clear enough for me to figure out ho…
... .. that's interesting. I hadn't though of doing that. Does ... (give or take a few t-states) when I sync.
Thought this would be simple... Z80Hi Folks, Started to read "Beyond simple BASIC, Delving Deeper into your ZX Spectrum" by Dilwyn Jones. This is a great book and I came across the…
Good, but could be optimized a tiny bit to shave off 20 T states and 3 bytes:
[code]
ld (quit_sp+1),sp
...
...
quit_sp ld sp,0
[/code]Thought this would be simple... Z80Hi Folks, Started to read "Beyond simple BASIC, Delving Deeper into your ZX Spectrum" by Dilwyn Jones. This is a great book and I came across the…
Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... or may not correspond to T states at which these bytes are ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... or may not correspond to T states at which these bytes are ...
