Search found 159 matches

by metalages
Sun Feb 28, 2021 9:45 am
Forum: Games - General
Topic: Lotus Esprit Turbo Challenge - STE enhanced (WIP)
Replies: 108
Views: 21423

Re: Lotus Esprit Turbo Challenge - STE enhanced (WIP)

A bit more knowledge but less implementation IMO ;)
I send you more details...
by metalages
Sun Feb 28, 2021 8:51 am
Forum: Games - General
Topic: Lotus Esprit Turbo Challenge - STE enhanced (WIP)
Replies: 108
Views: 21423

Re: Lotus Esprit Turbo Challenge - STE enhanced (WIP)

You are not interested by using the ym for engine in the end ?
by metalages
Tue Feb 23, 2021 12:58 pm
Forum: Games - General
Topic: Lotus Esprit Turbo Challenge - STE enhanced (WIP)
Replies: 108
Views: 21423

Re: Lotus Esprit Turbo Challenge - STE enhanced (WIP)

Yep but you have to transpose it with CPU.
And if you want to add skid sounds, you also have to mix.
A question of budget in the end ;)

My idea was : engine with YM + skid / crashes sounds with DMA (played in place) => nearly free.
But maybe the YM will play too loud compared to PCM
by metalages
Tue Feb 23, 2021 11:15 am
Forum: Games - General
Topic: Lotus Esprit Turbo Challenge - STE enhanced (WIP)
Replies: 108
Views: 21423

Re: Lotus Esprit Turbo Challenge - STE enhanced (WIP)

For Vroom the sound was rather cool indeed. I don't know exactly how it works but it may use a timer interruption at variable speed to emulate the RPM ? (or premix ?). Also Vroom is not 50 fps. Timer interrupts will not work correctly with heavy blitter use, so you need to premix the samples for DMA...
by metalages
Tue Feb 23, 2021 10:30 am
Forum: Games - General
Topic: Lotus Esprit Turbo Challenge - STE enhanced (WIP)
Replies: 108
Views: 21423

Re: Lotus Esprit Turbo Challenge - STE enhanced (WIP)

I understand ;)
On the technical side, the video you have sent, the engine synthesizer seems to use complex things like mixing layers of sounds.
The STe is really poor on CPU side to do complex things with sound.
Just mixing without transpose is already costly (and for RPM we need transpose).
by metalages
Tue Feb 23, 2021 9:41 am
Forum: Games - General
Topic: Lotus Esprit Turbo Challenge - STE enhanced (WIP)
Replies: 108
Views: 21423

Re: Lotus Esprit Turbo Challenge - STE enhanced (WIP)

My intent was : is there some way on the STe to create an "acceptable" sound with very low CPU usage. I don't know what's left into the frame, but managing variable RPM in PCM will need CPU and even more if you use several mixed layers to obtain a realistic engine. My comparison point was more the A...
by metalages
Mon Feb 22, 2021 9:59 pm
Forum: Games - General
Topic: Lotus Esprit Turbo Challenge - STE enhanced (WIP)
Replies: 108
Views: 21423

Re: Lotus Esprit Turbo Challenge - STE enhanced (WIP)

Cool thanks.
It was a quick try so I have not investigate modifying noise freq in the same time.
If you are interested, ask me when you will have a look at the sound, I will be able to give you details on the parameters I have tried for the YM.
by metalages
Mon Feb 22, 2021 6:54 pm
Forum: Games - General
Topic: Lotus Esprit Turbo Challenge - STE enhanced (WIP)
Replies: 108
Views: 21423

Re: Lotus Esprit Turbo Challenge - STE enhanced (WIP)

Another try restarting the triangle at 25hz :)
Noise freq also a bit different
by metalages
Mon Feb 22, 2021 5:03 pm
Forum: Games - General
Topic: Lotus Esprit Turbo Challenge - STE enhanced (WIP)
Replies: 108
Views: 21423

Re: Lotus Esprit Turbo Challenge - STE enhanced (WIP)

Great work ! Perfect frame rate and very fluid movements. About sound, if you want to avoid having to tranpose pcm sound for rpm (which may be CPU consuming) what about using the ym in a better way (buzzer + noise for instance) and keep DMA audio to play other sounds like skid noise... ? Here is a q...
by metalages
Sun Jan 03, 2021 9:54 pm
Forum: Galleries
Topic: Some converted NEOchrome Master "raster" images
Replies: 35
Views: 55244

Re: Some converted NEOchrome Master "raster" images

Anima wrote: Sun Jan 03, 2021 8:01 pm Correct.
Thanks for the info :)
by metalages
Sat Jan 02, 2021 8:50 pm
Forum: Galleries
Topic: Some converted NEOchrome Master "raster" images
Replies: 35
Views: 55244

Re: Some converted NEOchrome Master "raster" images

Does Neomaster imply 16 colors by scanline ?
If this is the case i guess colors are changed into the borders which means palette is stable for the whole line at the opposite of spectrum 512 or similar approach ? Am i right ?
by metalages
Sat Jan 02, 2021 6:17 pm
Forum: 680x0
Topic: Some blitter advice...
Replies: 9
Views: 745

Re: Some blitter advice...

I use the blitter to mix interleaved sounds using shift and mask but it needs to store source samples interleaved. https://github.com/gibs75/demOS/blob/master/DOCS/BLITSnd/BLITSnd_2.md in C https://github.com/gibs75/demOS/blob/master/DEMOSDK/BLITSNDP.C in ASM https://github.com/gibs75/demOS/blob/mas...
by metalages
Mon Sep 14, 2020 6:46 am
Forum: Coding
Topic: Blitter Execution Times
Replies: 44
Views: 8774

Re: Blitter Execution Times

Nice work ! :o
by metalages
Sat Aug 29, 2020 10:37 pm
Forum: Games - General
Topic: Mixed Resolution Games
Replies: 4
Views: 960

Re: Mixed Resolution Games

Hollywood poker maybe ? :)
by metalages
Tue Aug 25, 2020 8:54 am
Forum: Professionals
Topic: RetroTINK 2X-SCART with Atari STE
Replies: 22
Views: 3100

Re: RetroTINK 2X-SCART with Atari STE

Thanks for the detailled explanation.
Do you know where we can buy a corrected SCART cable ?
by metalages
Tue Aug 25, 2020 7:16 am
Forum: Professionals
Topic: RetroTINK 2X-SCART with Atari STE
Replies: 22
Views: 3100

Re: RetroTINK 2X-SCART with Atari STE

Does it adapt correctly to the fact RGB signals are highter on the ST than the SCART standard or do you need to insert some resistors on the scart cable to have correct black / color levels ?
by metalages
Mon Aug 03, 2020 8:58 pm
Forum: Coding
Topic: Best C2P routine?
Replies: 15
Views: 1953

Re: Best C2P routine?

There are considerations about blitter and C2P into the very good blitter FAQ document available here https://dhs.nu/files.php?t=single&ID=141
by metalages
Mon Feb 17, 2020 7:26 am
Forum: Coding
Topic: Decreasing colours (algorithm)
Replies: 17
Views: 3335

Re: Decreasing colours (algorithm)

by metalages
Wed Feb 12, 2020 7:09 am
Forum: Games - General
Topic: Lotus Esprit Turbo Challenge - STE enhanced (WIP)
Replies: 108
Views: 21423

Re: Lotus Esprit Turbo Challenge - STE enhanced (WIP)

Blitter is good at interleaving and looping. My thought was using DmA in stereo. One channel for each player (if I well understand the need). Revs need to be stored interlaced then use shift and masks to do the right thing.
by metalages
Tue Feb 11, 2020 9:22 pm
Forum: Games - General
Topic: Lotus Esprit Turbo Challenge - STE enhanced (WIP)
Replies: 108
Views: 21423

Re: Lotus Esprit Turbo Challenge - STE enhanced (WIP)

Glad you like the engine sound! Happy to sort the other sound effects too if wanted. There are some lines in that source I commented out (lines 61, 105, 107, 121, 122, 124, 126 and 138), if they're uncommented you'll get more steps but it's a bit clicky because it has to restart the sample, otherwi...
by metalages
Mon Aug 26, 2019 8:16 pm
Forum: Demos - General
Topic: "We Were @" demo question
Replies: 19
Views: 8752

Re: "We Were @" demo question

:) thanks for the great work :)
by metalages
Mon Aug 26, 2019 6:22 pm
Forum: Demos - General
Topic: "We Were @" demo question
Replies: 19
Views: 8752

Re: "We Were @" demo question

troed wrote:Ok. Sounds like there indeed are a bunch of 2MB STEs - so at least that work was in order :) Also shows that not all effects were just animations from RAM ;)
yey

smaller ram implies more real time ;)
by metalages
Mon Aug 26, 2019 6:25 am
Forum: Demos - General
Topic: "We Were @" demo question
Replies: 19
Views: 8752

Re: "We Were @" demo question

I have 2mb on my ste ;)

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