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Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…
[QUOTE=Patrik Rak;320244]Come on, people, [URL=" ... to go.[/QUOTE]
[QUOTE=Patrik Rak;320294]Given the math behind ... 8 bit in the A register:
[CODE]
rnd ... -
[NEW] Retro Virtual Machine v1.0.0 for OSX released!!!!Here it is! Retro Virtual Machine v1.0.0 RELEASED!!!! Many thanks first to Patrik Rak for the PZX format and for their Z80 tests without which RVM…
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Many thanks first to Patrik Rak for the PZX format and ... Z80 emulation, including the ‘memptr’ register and the hidden flag ‘q ... -
MEMPTR edge casesFor no particular reason, I've finally got round to emulating MEMPTR in Fuse. A few bits which aren't completely clear to be from the [url="http://zx…
... set on IN register, (C) and OUT (C), register for registers [i ... .worldofspectrum.org/forums/discussion/41834/"]Patrik Rak's tests[/url] so I ... -
New protection systemsAs a follow-up to [URL="http://www.worldofspectrum.org/forums/showthread.php?t=14311&page=2"]this[/URL] thread regarding relatively new protection sy…
[QUOTE=Patrik Rak;187143]I had a look ... forgetting to correct the R register so it made lots of ... -
New protection systemsAs a follow-up to [URL="http://www.worldofspectrum.org/forums/showthread.php?t=14311&page=2"]this[/URL] thread regarding relatively new protection sy…
[QUOTE=Patrik Rak;187166]The screen content doesn' ... it would affect the R register. Edit: Oh, I see, that ... and forgot that the R register would be totally wrong if ... -
New protection systemsAs a follow-up to [URL="http://www.worldofspectrum.org/forums/showthread.php?t=14311&page=2"]this[/URL] thread regarding relatively new protection sy…
[QUOTE=Patrik Rak;187166]The screen content doesn' ... it would affect the R register. Edit: Oh, I see, that ... LDDR) coupled with the R register didn't cause any real ... -
Spectaculator 7 Beta 1Spectaculator 7 has amazingly somehow made it into beta! I've just sent the usual suspects (aka beta testers) their e-mail with details. I know a f…
[quote=Patrik Rak;267976]Could I have a small request regarding the register window ... -
What are the best shoot-em-ups for the Spectrum?I mean, besides Zynaps. That's pretty much a given.
[QUOTE=Patrik Rak;276900]The Steel Eagle might ... which made sure the envelope register is written to even when ... conversion as well?
Patrik -
Questions about ZXDSFinally got my M3 DS Real Rumble Pack, installed ZX DS and started playing with it. It looks superb, but I'm still trying to find my way around it. S…
... more?[/QUOTE]
[QUOTE=Patrik Rak;283247]6) I had to ... , instead of the sound bias register which comes too late, after ... use of the sound bias register together with the bias sample ... recent release. Enjoy!
Patrik -
Understanding the StackSorry folks. I guess I'm going to be a pain for a little while. Hope it's ok with everyone. I'm currently studying the stack and wrote the little pr…
[quote=Patrik Rak;328482]And another thing worth ... call from BASIC the BC register holds the value of the ... -
SZX Beta 128 (aka TRDOS) block questionHello, I have a question or two regarding the Beta 128 (aka TRDOS) block of SZX. Hopefully someone (Jon, Philip) will help me. What is supposed to …
Hi Patrik,
[QUOTE=Patrik Rak;466967]
It writes the ... , and feeds it to system register on restore, which is wrong ... the content of the status register on restore.[/QUOTE]
SZX Beta 128 (aka TRDOS) block questionHello, I have a question or two regarding the Beta 128 (aka TRDOS) block of SZX. Hopefully someone (Jon, Philip) will help me. What is supposed to …
[QUOTE=Patrik Rak;466967]- Or am I supposed ... value written to the system register?[/QUOTE]
BTW, I ... pretty much given...
PatrikSZX Beta 128 (aka TRDOS) block questionHello, I have a question or two regarding the Beta 128 (aka TRDOS) block of SZX. Hopefully someone (Jon, Philip) will help me. What is supposed to …
[QUOTE=Patrik Rak;467142]Fortunately TR-DOS ROM sets the system register before every ... last written to the system register (at least in case of ... shall not read the status register via #1F either, as the ...50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... 'distant'.
[QUOTE=Patrik Rak;523068]Are you sure that ... other problems.
[QUOTE=Patrik Rak;523068]Also, have you experimented ... or an EXX to swap register sets between lines to ... down.
[QUOTE=Patrik Rak;523068]I got it you ...Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…
[QUOTE=Patrik Rak;321132]OK, I became curious ... in the A register:
[/QUOTE]
Patrik have you calculated ...AY-3-8912 emulationI am trying to improve the emulation of the AY-3-8912 in FBZX wii. I studied the code of some emulators and read some documents. I would like to be…
[QUOTE=Patrik Rak;631340]The latter is ... 17-bit shift */
/* register. The input to the shift ... register is bit0 XOR bit3 */
... shifts of the */
/* register, what now is bit3 will ...AY-3-8912 emulationI am trying to improve the emulation of the AY-3-8912 in FBZX wii. I studied the code of some emulators and read some documents. I would like to be…
[QUOTE=Patrik Rak;631446]
So it's ... fed back to the shift register. The MAME guys seem to ...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…
[QUOTE=Patrik Rak;634506]The contrary is not entirely true, though, see EX DE,HL. :)[/QUOTE]EX DE,HL doesn't access DE or HL, it toggles a bit that directs the internal data bus to either the DE or HL register.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 …
[QUOTE=Patrik Rak;636071]OK, here goes a ... , it is more economical in register use which makes it more ...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 …
[QUOTE=Patrik Rak;636666]You seem to have ... reducing the register usage (and size optimization, if any).
Patrik[/QUOTE ...MEMPTR tests for emulator authorsI've recently been completing my MEMPTR implementation and have written a series of tests in [URL="http://homepage.ntlworld.com/mark.woodmass/z80test…
[QUOTE=Patrik Rak;659726]I was wondering if ... on any bit of F register, which is quite annoying. BTW ... later as well.
PatrikSCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…
[QUOTE=Patrik Rak;666527]Of course, I agree ... other emulator authors...
Patrik[/QUOTE]
I'm ... MEMPTR (e.g. the WZ register) too. This new discover about ... are transferred to the F register.
Knowing all the ...SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…
[QUOTE=Patrik Rak;667290]Meantime, I have finished ... is affected by the Q register, which is good. It ... interrupt might affect the Q register. And it turns out that ... an interrupt clears the Q register as well, so regardless of ... CPU behavior.
Patrikpathfindingworking on pathfinding in the game. here is Russian description of Lee's algorithm: [url]http://algolist.manual.ru/games/wavealg.php[/url] "if-then"…
[QUOTE=Patrik Rak;699944]Array A[] which points ... worth it.
[QUOTE=Patrik Rak;699944]takes constant time.[/QUOTE ... area of 256 bytes, with register HL pointing to first element ...pathfindingworking on pathfinding in the game. here is Russian description of Lee's algorithm: [url]http://algolist.manual.ru/games/wavealg.php[/url] "if-then"…
... see below.
[QUOTE=Patrik Rak;700164]Why don't you ... posts :)
[QUOTE=Patrik Rak;700167][QUOTE=Einar Saukas;698243 ... and we only need a register per stack storing the address ... s empty without using another register or even remembering its ...SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…
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Thanks, zub. The Q register was just a broader concept ... are moved to the F register), we have no evidence how ... sentence?
[quote]
Patrik Rak however shortly after [url="http ... new every day! :)
PatrikPentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
[QUOTE=Patrik Rak;758728]I still haven't ... or the content of the register might be the previous attribute ... the intended behavior.
PatrikSCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…
[QUOTE=Patrik Rak;758844]Thanks, zub. The Q register was just a broader ... are moved to the F register), we have no evidence ... this regard, so the Q register seems very unlikely to exist ... instruction that updates the flags register, but that's an implementation ...Timing_Tests-48k_v1.0 results...Hello All, I ran these [URL="http://www.zxspectrum4.net/op_timing.php"]tests[/URL] on my emulator and some of the tests failed.. so I tried it on a …
[QUOTE=Patrik Rak;803908]Could we then perhaps ... . :)
Thanks,
Patrik[/QUOTE]
If its ... as relying on each resulting register being as expected!random number generator without using rnd in basicwhat is the simplest way to generate random numbers in basic (0-255), without using the rnd statement? i also want it to always generate the same…
... FRAMES or reading the R register can be fine too, but ... ://gist.github.com/raxoft/2275716fea577b48f7f0"]Patrik Rak CMWC routine[/url], as it ...
