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Video generation using a CPUWe know it is possible to generate a video signal using a CPU, and this technique was often used on low-end computers in the early 1980's (for exampl…
... it does nothing for four t-states (except generating that crucial refresh ... contrast, the ZX-80 doesn't have this and consequently can ... , but not both; that didn't stop people from writing games ... -
TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…
... worldofspectrum.org/forums/showthread.php?t=39194"]http://www.worldofspectrum. ... seems the timings are '5602 T-states earlier than "normal" (non- ... 8760... yet an earlier post states that 'the 6,5,4 ... pattern starts at 8759 T-states after the interrupt'. Help ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... comparison measured using ticks (in T-states):
[CODE] |Standard| Turbo | Mega ... T| 499841 T|2527520 T|2103116 T
Elexis.scr |740872 T|562310 T| 516149 T|2523298 T ... to regular screen takes 2470124 T-states, which is almost 97% of ... -
RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…
... version[/URL] runs in 2470138 T-states, which means about 0.7 ... bytes version above in 4842887 T-states, which means about 1.4 ... version[/URL] runs in 18319443 T-states, which means about 5.2 ... of ZX7 decompressor, that doesn't require RCS decoding :)
RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…
... ticks, it executes in 2397569 T-states, equivalent to 0.7 second ...Fastest Z80?Hi , Could somebody explain more about the Kawasaki Z80 33 MHz to me? Is it fully backwards binary compatible with older Z80s and could it be used a…
... the instructions don't have the same number of T-States (the sample ...maximum addressable RAM for a Z80 using bank switching?What is the maximum addressable RAM for a Z80 using bank switching? The Enterprise64 home computer could address up to 4MB, is this the limit for a …
... take about 34E+4 T states (16384 times 21 T, considering each LDIR ... executed consumes 21 T) to fill one bank with ... spent will be 22E+9 T states or, for a 4 MHz ...maximum addressable RAM for a Z80 using bank switching?What is the maximum addressable RAM for a Z80 using bank switching? The Enterprise64 home computer could address up to 4MB, is this the limit for a …
... take about 34E+4 T states (16384 times 21 T, considering each LDIR ... executed consumes 21 T) to fill one bank with ... spent will be 22E+9 T states or, for a 4 MHz ...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 ...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 …
... and the number of frames/T-states will be in the Profile ... in ZXSpin, but it doesn't seem to work. Right-click ... (inevitably, I suppose) it doesn't log any statistics when the ... run. The Remove option doesn't do anything either.Timing in loading routinesJust for curiosity I have done some experiments with SAVE command in accurate emulators, and then analyzing the generated WAV and I have obtained lit…
... a tape format won't be centered in any ... else than 3.5MHz based T-States for timing, but I ... with any tool which wouldn't understand that particular block ...
So you don't really have to be obsessed ... with T-state accuracy - single T state is well ...Emulator audio...how?Hi all. I am in the process of writing a Spectrum emulator (c#) for my final year project at university. I've got it all working, apart from sound. …
... monitoring the state every few t-states as this could be heavy ...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…
... shorter in that it doesn't waste a load of space ... execution time is only 98364 T-states which is really fast for ...WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... can be read in two T-states). Instead of a single four ...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…
... byte and at least 2 T-states on every UDG. Are these ... good solution if you don't have too many "sprites" on ...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…
... byte and at least 2 T-states on every UDG. Are these ... /> Not much good. You couldn't guarantee that you could shrink ...Assembler v Machine CodeHi. I've been looking at a lot of the code examples in the Development section and can see that Assembler is the way to go. However, I was wondering …
... to the point you can't sleep. I have often lain ... save 2 bytes or 8 t-states!Assembler v Machine CodeHi. I've been looking at a lot of the code examples in the Development section and can see that Assembler is the way to go. However, I was wondering …
... to the point you can't sleep. I have often lain ... save 2 bytes or 8 t-states![/QUOTE]
............ pacing about ...Assembler v Machine CodeHi. I've been looking at a lot of the code examples in the Development section and can see that Assembler is the way to go. However, I was wondering …
... . I memorized opcode length and T states spent for almost all Z80 ...I failed to ride a motorcycle in snow....[youtube]ehIEIaX47Us[/youtube]
... * because it takes so many t-states . 2 blocks of the picture ...I thought I'd give assembly a goAnd well being an absolute newb,I'm absolutely useless.I need your help. I thought I'd give this a go in zxspin [url]http://chuntey.wordpress.com/20…
... ].[/QUOTE]
thats where t-states are from ? ;) .. I am more ...I thought I'd give assembly a goAnd well being an absolute newb,I'm absolutely useless.I need your help. I thought I'd give this a go in zxspin [url]http://chuntey.wordpress.com/20…
... Zilog's Z80 Product Specification, T-states and all that crap... :lol ...Buzzer sounds tips'n'tricksSo I have an ARM Cortex M3 with a buzzer connected to its GPIO pin. And because I read this forum I know that there is no need to add a separate buzz…
... work. Note that you won't be able to reuse note ... timing stable, so count your t-states.
[CODE]
... here, which needs as many t-states
;to execute as if ... we hadn't skipped the previous part
Bad Loading screens.All this Avalon and Dragontorc talk got me thinking about 'Sorcery' that was on the Softaid compilation. Then I had a glance at 'The Pyramid' [img]h…
... /showscreen.cgi?screen=screens/load/t/gif/TaffyTurner.gif[/IMG]
t assume or know the next ... state and it takes extra t-states(same as raster time ? on ...Bad Loading screens.All this Avalon and Dragontorc talk got me thinking about 'Sorcery' that was on the Softaid compilation. Then I had a glance at 'The Pyramid' [img]h…
... showscreen.cgi?screen=screens/load/t/gif/TaffyTurner.gif[/IMG]
t-states(same as raster time ? ... showscreen.cgi?screen=screens/load/t/gif/Tutankhamun.gif[/IMG][IMG ... showscreen.cgi?screen=/screens/load/t/gif/Tutankhamun.gif[/IMG]
Buzzer sounds tips'n'tricksSo I have an ARM Cortex M3 with a buzzer connected to its GPIO pin. And because I read this forum I know that there is no need to add a separate buzz…
... /> ;...13+7+18+18=56 t-state in 7 bytes
t work after the second counter ... /> 6 bytes, 57 t-states. That 1 t-state doesn't really spoil the ...Machine code loopsDear all, 30 years too late I know, but I'm finally starting to get to grips with Machine Code - something I could never manage back in my early tee…
... increased loop overhead (24 * n T-states) and destroys the A register ... (12 * n + 14 * (n / 16) T-states)
ld b, [remainder ...
