Search found 648 matches

by leonard
Tue Aug 27, 2019 4:01 pm
Forum: Demos - General
Topic: "We Were @" demo question
Replies: 19
Views: 1556

Re: "We Were @" demo question

Cyprian wrote:Would be possible create the STfm version?


I won't try myself for sure :)
by leonard
Mon Aug 26, 2019 9:27 pm
Forum: Demos - General
Topic: "We Were @" demo question
Replies: 19
Views: 1556

Re: "We Were @" demo question

Hi,

You can download a new version supporting both 2MiB and 4MiB version! Just use the same download link in pouet.net page

https://www.pouet.net/prod.php?which=66702

Enjoy!
by leonard
Mon Aug 26, 2019 6:51 pm
Forum: Demos - General
Topic: "We Were @" demo question
Replies: 19
Views: 1556

Re: "We Were @" demo question

Or also, you could put together a 1mb version with an YM rendition of the soundtrack. :D Wow that's a greta idea :) If any musician is able to do that, I could do a 1MiB version one day with chip music! Anyway some of you have 2MiB machine, and I already have 2MiB version on my local disk, so let's...
by leonard
Sun Aug 25, 2019 8:25 pm
Forum: Demos - General
Topic: "We Were @" demo question
Replies: 19
Views: 1556

Re: "We Were @" demo question

troed wrote:Surely anyone with actual interest in using the real hardware has already maxed the SIMMs in their STEs? ST is a whole different ballgame however.


yeah, so maybe even a 2MiB version is useless :(
by leonard
Sun Aug 25, 2019 6:17 pm
Forum: Demos - General
Topic: "We Were @" demo question
Replies: 19
Views: 1556

"We Were @" demo question

Hi! I was about to release a 2MiB version of "We Were @" demo . This version is on my disk for a while. But I had a new idea: I think I can do a 1MiB version, without music. I want to know if I should do it or not. From one side, I think it's bad idea, because the demo without music isn't ...
by leonard
Sat Aug 24, 2019 1:38 pm
Forum: Coding
Topic: Timer B + DMA at once
Replies: 17
Views: 850

Re: Timer B + DMA at once

I confirm the STE DMA sounnd playback does not take any cycle to the CPU or video decoding. The "We Were @" rely on that to display fullscreen effects with sampled music ( the sampled "free" playing sound is one of the great STE feature :) )
by leonard
Sun Feb 10, 2019 5:22 pm
Forum: 680x0
Topic: LZ4 decoder (assembler)
Replies: 48
Views: 17390

Re: LZ4 decoder (assembler)

Apart from the 4k binary Cyprian tried, has anyone done any other tests regarding pack ratio? I'm still favouring ARJ mode 4 and 7 for max pack ratio, but this looks like a great alternative for when depack speed is crucial. Regarding packing ratio, if you're looking for best ratio ever, use shrink...
by leonard
Fri Jan 18, 2019 12:23 pm
Forum: 680x0
Topic: LZ4 decoder (assembler)
Replies: 48
Views: 17390

Re: LZ4 decoder (assembler)

Hi! I was about to post something here about my fast LZ4 decoder, and by searching "LZ4" I find that thread! I did three versions of LZ4 depacker. One of them is quite fast. If anyone is interested: https://github.com/arnaud-carre/lz4-68k ( LZ4 has interesting properties, such as ability t...
by leonard
Tue Jul 18, 2017 6:42 pm
Forum: Coding
Topic: LZMA - best packing method ?
Replies: 11
Views: 7231

Re: LZMA - best packing method ?

UPX depacks faster than ARJBETA -m7 but has lower compression ratio. ( for instance, We Were @ demo won't fit on two floppies if I use UPX as a packer (I did the test))
If you really want best compression ratio and acceptable depacking speed, use ARJBeta.
by leonard
Thu Jul 13, 2017 11:03 pm
Forum: Coding
Topic: LZMA - best packing method ?
Replies: 11
Views: 7231

Re: LZMA - best packing method ?

For depacking speed of various depacker on various atari machine, you can refer to numbers here: http://www.atari-forum.com/viewtopic.php?f=16&t=31438&p=316491#p316491 (it includes depacker routine size, and packfire tiny and large model .pft and .pfl) Packfire has really good compression ra...
by leonard
Thu Jul 13, 2017 10:52 pm
Forum: Coding
Topic: Screen Pointer Update glitch
Replies: 6
Views: 5749

Re: Screen Pointer Update glitch

And if your frame rate has huge amplitude, you could generalize the algorithm to <n screen buffering> as in famous European demo 3D screen. I think they use 8 screens if I remind well.
by leonard
Sat May 13, 2017 4:12 pm
Forum: Demos
Topic: "We Were @" music
Replies: 7
Views: 8732

Re: "We Were @" music

BenOVR wrote:Do you have a native player for .ym ?


Hi Ben! comment va?

No there is no native YM player on ATARI :( It reminds I started to code one long time ago but never finished. Maybe I can look at my code archive.
by leonard
Sat May 13, 2017 4:09 pm
Forum: Demos
Topic: "We Were @" music
Replies: 7
Views: 8732

Re: "We Were @" music

unfortunately ST-Sound doesn't play it Oh god you're right! I tested the YM file with my XMPlay STSound plugin only! After investigation, StSound95 has a bug when dealing with signed "MIX1" music type! Instead of fixing StSound95 bug, I changed the YM file to unsigned sample data, so it's...
by leonard
Fri May 12, 2017 8:37 pm
Forum: Demos
Topic: "We Were @" music
Replies: 7
Views: 8732

"We Were @" music

Hi everyone! "We Were @" music is made of several sample loops, chained in real time depending of loading time, effect sync etc. Anyway I did a standalone version very close to the demo. It's made from the original loops from Clawz so it's 44Khz, 16bits stereo ( Atari version is downsample...
by leonard
Thu Apr 20, 2017 8:06 pm
Forum: The Digital Department
Topic: 8 channel MODs
Replies: 9
Views: 8775

Re: 8 channel MODs

The ST can too, but with audibly lower quality, You know. Paulo Simoes did a 8 (and even more) channels STF fast replay routine, with the best quality on STF I guess. http://www.pouet.net/prod.php?which=56822 Technical details here: http://www.atari-forum.com/viewtopic.php?f=28&t=20760
by leonard
Mon Apr 17, 2017 7:50 pm
Forum: Coding
Topic: ATARI depacking benchmark
Replies: 35
Views: 12681

Re: ATARI depacking benchmark

DarkLord wrote:Oh, the STacy is an Atari portable (although at its weight, "luggable" might
be a better description!). :)


Oh sorry I missed that! Of course I know Stacy by name, but don't know about the acceleration card. That's really a fast ST!
by leonard
Mon Apr 17, 2017 9:07 am
Forum: Coding
Topic: ATARI depacking benchmark
Replies: 35
Views: 12681

Re: ATARI depacking benchmark

Here's my 40mhz 68030, 40mhz 68882, TOS v3.06 equipped Pak 68/3 STacy. Thanks for these new numbers! I don't know there is some 40Mhz version of TT, but it seems it's a veru fast machine! (does the routine take advantage of FPUs?) not at all BTW, how do you cleanly stop the test? you can't. The ben...
by leonard
Thu Apr 06, 2017 10:24 pm
Forum: Coding
Topic: ATARI depacking benchmark
Replies: 35
Views: 12681

Re: ATARI depacking benchmark

Here's the results from my TT, MSTE and Falcon (3 machines, 3 different monitors, 1 phone ghetto cam so bare with me!) Thanks ggn! It's really interesting. I'm surprised how falcon is "really not so fast" compared to TT or 16Mhz MSTE! I guess your TT is 32Mhz right? it's faster than falco...
by leonard
Thu Apr 06, 2017 10:18 pm
Forum: Coding
Topic: ATARI depacking benchmark
Replies: 35
Views: 12681

Re: ATARI depacking benchmark

latest news: I modify "We Were @" demo installer to use upx --nrv2b, and first floppy won't fit! All screens are bigger than arj -m7! I keep arjbeta -m7 for my demos :) With UPX: 25642 32762 536708 10736 42576 32978 7920 20240 152788 With ARJ -m7 24924 31462 507354 10704 40284 32172 7790 1...
by leonard
Thu Apr 06, 2017 9:28 pm
Forum: Coding
Topic: ATARI depacking benchmark
Replies: 35
Views: 12681

Re: ATARI depacking benchmark

Here is a speed test of nrv2b. The speed is quite impressive for the packing ratio. it's not as good as arj -m7 2 times on 3, but depack speed is x1.5 faster. It's cool for atari demo files PRG because the total time is load_time + depack_time. But in case of demo with trackloader this is not useful...
by leonard
Thu Apr 06, 2017 8:19 pm
Forum: Coding
Topic: ATARI depacking benchmark
Replies: 35
Views: 12681

Re: ATARI depacking benchmark

thanks! I will have a look carefully. I started to disasemble the UPX PRG bootstrap, the depacker is at the end of the PRG and seems really small. It does not contains any huffman-like decoding, that's why it's so fast. The packing ratio is quite good for a non-huffman offset-length coding. I really...
by leonard
Thu Apr 06, 2017 7:25 pm
Forum: Coding
Topic: ATARI depacking benchmark
Replies: 35
Views: 12681

Re: ATARI depacking benchmark

troed wrote:The header+included depack code in those packed PRGs is ~480 bytes in size so should be subtracted I think compared to the other test cases.


you're right! btw do you know where can I extract the packed data only (offset & size) and depacking routine?
by leonard
Thu Apr 06, 2017 7:17 pm
Forum: Coding
Topic: ATARI depacking benchmark
Replies: 35
Views: 12681

Re: ATARI depacking benchmark

I just made a test with upx --nrv2b, it's close to arj -m7. Here are size results: -a---- 01/04/2017 18:32 5560 kernel.l77 -a---- 01/04/2017 18:32 3885 kernel.am4 -a---- 06/04/2017 20:59 3836 kernel.upx -a---- 01/04/2017 18:32 3347 kernel.am7 -a---- 01/04/2017 18:32 3310 kernel.ice -a---- 02/04/2017...
by leonard
Thu Apr 06, 2017 11:57 am
Forum: Coding
Topic: ATARI depacking benchmark
Replies: 35
Views: 12681

Re: ATARI depacking benchmark

The depacker fits in the boot sector, and the depack speed is so fast that I can get away with mostly no background loading in the demo - oh UPX, ok. According to https://sourceforge.net/p/upx/discussion/6805/thread/e7c6e993/ -nrv2b means LZO packing algortihm. LZO is really fast for decompression,...
by leonard
Wed Apr 05, 2017 8:35 pm
Forum: Coding
Topic: ATARI depacking benchmark
Replies: 35
Views: 12681

Re: ATARI depacking benchmark

Cyprian wrote:Is it autostart floppy disk?


it's a trackload demo system with bootsector etc. In case of MegaSTE I activate the cache and set to 16Mhz ( I use move.b #$ff,$ffff8e21.w )

For TT, I don't use TT ram at all ( I even don't know it exist :))

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