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| From: indi (all posts)
Date: 1999-01-14
Subject: Re: Minus4 v2 Re: FDGF, AFAIK, FCKU, and so on...
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>Frame skipping is a bless. It increments speed of my emu by 80-90%...
>(In my emulator there is a possibility to choose the number
>of skipped frames, but unfortunately almost no use of more than 5
>skips, it becomes really jammed... On the other hand: if you own a fast
>processor -means: at least 68040-40Mhz-, then using 5 skipped frames
>increase speed upto almost 150-180% compared to a real Plus/4.
>I just love playing with Driller and Total Eclipse on this speed...
>I have to "Be Quick Or Be Dead"... ;)))))
So far, my emulator draws every frame. Its okay speed wise... but if I could drop everyother frame.. itd be far nicer... Sound is the problem, since I have to fill the buffer funny...
>> I already do this for SID sound, and plus/4 digi's but I just use
>> AD-LIB for TED... I'd like TED samples to make it sound the same as a
>> plus/4...
>I use real time (non-sampled) sound, it is much faster. Sad to say:
>without line-synchron digital sound is unacceptable. So there is
>place for sampled sound... (And a fast machine too...)
I use a sample rate of 31200 which is 2 sample tic's per plus/4 scan line. This means its easy to build samples and keep it tied to EXACTLY the right frame rate. On my P200 it runs at exactly plus/4 speed.
The SID emulation is in "C" and available from my homepage BTW...
Do you have a homepage for your emulator?
>> >> You know the new SEGA dreamcast machine just out in Japan? It runs on
>> >> that! :-) (did that today to test the DX stuff...hehehehehe..)
>> >Do you own one? ;)))
>> No, my work does... and I have one there... :-)
>Jesse! On a hungarian amiga mailing list was a really big flame about
>this machine. Is this really fast as had been said?
I can't say much due to non-disclosures agreements... But... It can pump through the polys (Sonic Adventure IS very nice).. and it does have some custom CPU stuff allowing VERY fast 3D code. All in all, its a fast PC really...
>> Yeah... I think I'll move the CPU emulation around a bit so I can have
>> a few going at the same time... Windows would be idea for this... just
>> start another thread! :-)
>I checked this possibility in Frodo (multiplatform C64 emulator), but
>decrease speed much.
Yeah... I think it may... but to be honest Im not really THAT bothered about making things work blistering on slow machines... Im more interested in getting it correct for future machines.. But I allow stuff to be turned off for slow machines, which helps...
a P133 won't be able to run full SID and mode-x emulation... but it should be okay with no sound and in 320x200.. And if I add frame skip,
it should be great!
>Anyway, you would be in trouble with threads: different enviroment
>for each processor... If you solve this on a general way, that may
>decrease performance.
To be honest, my problem has never been CPU stuff, but screen processing.. running another CPU wouldn't slow it down THAT much..
>> I like threads. <g>
>I just love tasks... (Amiga Rulez!)
I miss the Amiga... great machine... I still have it (a poor wee A1200).. but Its just unused...
I did a cool SNES assember on it... beat a PC at compile times! :-)
Mike
^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^
Mike Dailly mike@scotch.demon.co.uk http://www.scotch.demon.co.uk
(Please remove the <REMOVE_ME> from my e-mail address when replying)
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