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BorderTron 3000A little bit of speccy-related fun for a Friday afternoon... I've knocked together a program for Windows which I've called Bordertron 3000 (a suitabl…
... my original, as mine doesn't flicker on either normal or ... timings).
I don't own a real speccy to ... takes an odd number of T states into the waitloop at the ... -
Byte-order backbufferThis is a tool for Z80 coders who wish the Spectrum screen had a serial layout. It runs as an interrupt mode 2 service routine and uses POP and PUSH …
What's the average speed of copying a single byte in t-states? -
Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…
... delay of another 2 T-states before changing the border ... [*] 2+3: adds 1 T-state delay in comparison to ... running with a 3 T-states delay in comparison to ... LIST]
What we don't know yet:
[LIST]
T-state delay).
[*] ... -
The most powerful 8-bit machine, and CPU?Further to the discussion in: [url]http://www.worldofspectrum.org/forums/newreply.php?do=newreply&p=621787[/url] What actually is the best 8-bit ma…
... , but the instruction set isn't one of those.[/QUOTE]
t as per that Wiki! -
ESXDOS v0.8.0 released (with NMI Browser)Hello, To celebrate the speccy's 30th birthday, here's the latest version of ESXDOS for DivIDE users. The full changelog is too long to post here, s…
... . But I can't see why you wouldn't be able to ... critical timed that one can't read FAT sectors to get ... ' from memory is about few T states (~6 reads from memory - 2 ... update pointer). but esxdos don't have syscall to get raw ... -
How to safely maximise available memoryHi All, I'm toying with an idea that will require I have as much memory available as possible. I'm a little embarrassed I have to ask this tbh. As…
... really cope without these few t-states. Unless you are making beeper ... -
ESXDOS v0.8.0 released (with NMI Browser)Hello, To celebrate the speccy's 30th birthday, here's the latest version of ESXDOS for DivIDE users. The full changelog is too long to post here, s…
... file so it doesn't have to scan the ... from memory is about few T states (~6 reads from memory - ... pointer). but esxdos don't have syscall to get raw ... :-) ) but unfortunately it doesn't work out: the routine performs ... the main loop doesn't even keep track of where ... -
Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…
... be as much as 24 T-States between ZXSpin and, basically, everything ... -
OpenSE Software CompatibilityWith the earlier Open82 project a page was set up on Wikia ([url]http://scratchpad.wikia.com/wiki/Open82[/url]) with compatibility information on var…
... right?... Even if you can't cram in anything else, FASTER ... the initialization routine), but don't free up enough bytes to ... only talking about a few t-states here, so it's unlikely ... I'm happy it doesn't break anything or introduce any ... -
Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…
... on the TK90X is 59736 T-states!
[I]EDIT ... " and "iocontention" from fusetest didn't work.[/I] -
ULAPlus: showing different screen modes in one screenI wanted to write a demo showing the same screen, converted to various screen modes available on the Spectrum (well, a Spectrum clone capable of show…
... ?[/QUOTE]
I don't really know. My clone does ... point is that I didn't have the border stripes at ... displayed) a little short (4 T-states), the flashing tiny blocks dissappear ... -
Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…
... be as much as 24 T-States between ZXSpin and, basically, everything ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... /> can be this (saving 7 T states in this code and 10 ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... and find another few redundant T-states.
Here is my ... /> ; this takes 15T states, but save 21T states from PUSH and POP ... ]P[/B] nz,print_string ; ISN'T THIS FASTER THAN JR?
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
...
jp nz,print_string ; ISN'T THIS FASTER THAN JR?
Another 8 T states:
[code]
ld ...Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... =Dr BEEP;632096]Another 8 T states:
[code]
ld ...Between interrupts and handlersSee there's this short period of time immediately after an interrupt comes but [i]before[/i] the control is transferred to an interrupt handler, abou…
... . In fact, these 19 T-states doesn't begin just when the low ... . The INT acknoledge cycle won't begin until the current instruction ... ensures that the CPU won't miss an interrupt no matter ...Simple explanation of interrupts (in the context of Z80/Speccy)I wondered if somebody on here could explain in simple terms how interrupts work on the Speccy and where interrupts are source from. Are they a natur…
... to &38 takes 17 T states, which is the same as ...Is there a DD40 instruction?On this page: [URL="http://mdfs.net/Software/Z80/Exerciser/Spectrum/zexall.src"]Z80 instruction set exerciser for Spectrum[/URL] I noticed the belo…
This instruction is a redundant (slower) version of [B]LD B,B[/B] that takes 8 T-states instead of 4 T-states:
[url]http://www.ime.usp.br/~einar/z80table/[/url]Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... version, except mine is 4 T-states faster, 1 byte shorter, and ...Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... version, except mine is 4 T-states faster, 1 byte shorter, and ...Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... version, except mine is 4 T-states faster, 1 byte shorter, and ... />
Only if you don't mind about the "it can ...Good character sets ?Just wondering if anyone had any favourite character sets ? :) The one in SE basic is quite nice and I'm aware (I used to have it in my head I'm sur…
... nice but my +2 can't display those modes. And of ... ]
You can't do per letter colour, but you can ...Good character sets ?Just wondering if anyone had any favourite character sets ? :) The one in SE basic is quite nice and I'm aware (I used to have it in my head I'm sur…
[QUOTE=aowen;637079]You can't do per letter colour, but you can ...Received my divide but stumpedAfternoon guys I am now a proud owner of a complete divide (complete with case).I've worked out how to load my tap files but i am assuming .tzx doesn…
... state of port #FE in T-States (more like a WAV file ...Received my divide but stumpedAfternoon guys I am now a proud owner of a complete divide (complete with case).I've worked out how to load my tap files but i am assuming .tzx doesn…
... state of port #FE in T-States (more like a WAV file ...BIFROST* ENGINE 1.2 released!Another improved version of the BIFROST* ENGINE is now available! Download it here: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0027405[/u…
... across the screen was 224 T states.
So I'd ... expected race_raster to be 224 t states long.
It seems ...T-States?Can anyone point me to any good reading (or summarise) that will explain exactly what a tstate is? At the moment for me, tstates are a useful gauge …
... actions take a multiple of T-states to complete. The speed ... fetch operation that takes 4 T-states to complete. Instructions are ... sensibly as some number of T-states. The M-cycles themselves ... .
In conclusion, T-states are the correct measure for ...BIFROST* ENGINE 1.2 released!Another improved version of the BIFROST* ENGINE is now available! Download it here: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0027405[/u…
... , on a standard background; recovering T states (at reti) pretty much as ...
