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Forum: Retrogaming General Discussion Yesterday, 21:07
Replies: 90
Views: 2,617
Posted By ross
Yep, the guess about xVOL set at the PWM_counter...

Yep, the guess about xVOL set at the PWM_counter overflow seems the most logical :)

It is verifiable, readind the same wave in two different set-up:
- set a period of 128
- first read with a...
Forum: Retrogaming General Discussion Yesterday, 17:53
Replies: 90
Views: 2,617
Posted By ross
Thanks, very interesting scope images. This...

Thanks, very interesting scope images.
This seems to clarify without a doubt how the volume works :)

I repropose:

If the AUDxVOL barrier is not hit there can be, for a 55.4Khz quantum, the...
Forum: Retrogaming General Discussion Yesterday, 12:21
Replies: 90
Views: 2,617
Posted By ross
I assumed that the counter counts up (like the...

I assumed that the counter counts up (like the video h cck counter) and AUDxVOL is a barrier.
This is because the PWM [sampling*] is at constant frequency (55420Hz) and need to mute the sample at...
Forum: Retrogaming General Discussion 08 July 2020, 18:19
Replies: 90
Views: 2,617
Posted By ross
This time not a praise, but a technical question...

This time not a praise, but a technical question (yes, not an appropriate thread, but there are already some technical discussions that a further I don't think is out of place..).

After all this...
Forum: Coders. Asm / Hardware 08 July 2020, 15:14
Replies: 45
Views: 2,755
Posted By ross
No, sorry. Only available for Win platform :)

No, sorry.
Only available for Win platform :)
Forum: Coders. Asm / Hardware 08 July 2020, 11:31
Replies: 45
Views: 2,755
Posted By ross
Could it be only bad unpacker code and not the...

Could it be only bad unpacker code and not the data intself? (see message on the different decompressor in Heimdall).
Could it be that only one of the two versions of RNC is affected?
However, I...
Forum: Coders. Asm / Hardware 08 July 2020, 00:17
Replies: 45
Views: 2,755
Posted By ross
The use of d0 also depends on the type of decoder...

The use of d0 also depends on the type of decoder used.

They are both in-place, but differ in the memory layout:
- forward in memory (nrv2s, standard) : slightly faster, but requires data to be...
Forum: Retrogaming General Discussion 06 July 2020, 18:06
Replies: 90
Views: 2,617
Posted By ross
I agree (but don't belittle Paula, it's a great...

I agree (but don't belittle Paula, it's a great chip for it's times, and still good today ;)).

My dream is a clock-port device with 2xSID (so mapped and banked in Amiga memory), for stereo...
Forum: Retrogaming General Discussion 06 July 2020, 16:43
Replies: 90
Views: 2,617
Posted By ross
Unfortunately not. But you can always get...

Unfortunately not.

But you can always get Jeri Ellsworth to give it to you ;)
Forum: Retrogaming General Discussion 06 July 2020, 13:09
Replies: 90
Views: 2,617
Posted By ross
Nah, Paula is a simple DAC :p EDIT: be...

Nah, Paula is a simple DAC :p

EDIT: be patient Thomas, I'm kidding ;)


Yes, result = (sample * vol) / max_volume is good.
Then how to spread the result for Paula is another matter.
But the...
Forum: Retrogaming General Discussion 06 July 2020, 13:07
Replies: 90
Views: 2,617
Posted By ross
I'm pretty sure I've talked with (Britelite?)...

I'm pretty sure I've talked with (Britelite?) about a different way to spread the 16 bit in the two channel to decrease noise and improve dynamics.
Principle is the same :)
Forum: Retrogaming General Discussion 06 July 2020, 12:50
Replies: 90
Views: 2,617
Posted By ross
hmm, theoretically yes, a 15 bit dynamic range is...

hmm, theoretically yes, a 15 bit dynamic range is reacheable with 2*(8+6), but it is practically impossible with Paula; so our 14 bit joint system is really a maximum (although I think even it is...
Forum: Nostalgia & memories 06 July 2020, 11:51
Replies: 25
Views: 808
Posted By ross
:sad Requiescat in pace.

:sad

Requiescat in pace.
Forum: Retrogaming General Discussion 06 July 2020, 11:30
Replies: 90
Views: 2,617
Posted By ross
True, but you are constrained to max volume only...

True, but you are constrained to max volume only for frequencies >55420Hz (see a previous message).
So you are free to play with PWM and 'increase' Q-bits :)


Yes, only academic (this 'volume'...
Forum: Retrogaming General Discussion 06 July 2020, 10:49
Replies: 90
Views: 2,617
Posted By ross
Yep, but unpredictable :) The dynamics of one...

Yep, but unpredictable :)
The dynamics of one machine may be different from that of others due to 'physical' differences in the cut-off filter.
But maybe I understand why we are not with values, we...
Forum: Retrogaming General Discussion 06 July 2020, 09:46
Replies: 90
Views: 2,617
Posted By ross
Well, this is a long debated topic :) ...

Well, this is a long debated topic :)
Calibration in my opinion is because there are several Paula with different sample / "volume" relationships (and D/A 'errors') that need a manual correction.
...
Forum: Retrogaming General Discussion 06 July 2020, 02:14
Replies: 90
Views: 2,617
Posted By ross
Hi roondar, the demo is...

Hi roondar, the demo is http://www.pouet.net/prod.php?which=65872

:great
Forum: Retrogaming General Discussion 06 July 2020, 01:42
Replies: 90
Views: 2,617
Posted By ross
As I said I could be wrong, and more than happy...

As I said I could be wrong, and more than happy to be ;)
But real world test seem to confirm that dynamic range for Paula is not 14 bit (see link...
Forum: Retrogaming General Discussion 05 July 2020, 23:31
Replies: 90
Views: 2,617
Posted By ross
I think that PWM does not allow you to have a...

I think that PWM does not allow you to have a linear scale between the values (not bijective), but create many duplicate (the PWM volume is not like a natural multiplicative function, but a temporal...
Forum: Retrogaming General Discussion 05 July 2020, 21:28
Replies: 90
Views: 2,617
Posted By ross
:agree This is why I insist that it is...

:agree
This is why I insist that it is absolutely not comparable to the other DAC chips!
Anyway I think there is not 16321 voltage levels.
In the past I've make some code to calculate the unique...
Forum: Retrogaming General Discussion 05 July 2020, 20:56
Replies: 90
Views: 2,617
Posted By ross
Yep, the wiki talks about an "hardware mixing...

Yep, the wiki talks about an "hardware mixing ability that does not use additional processor power and allow playing back tracker modules in high quality", so probably a digital resampler.
Forum: Retrogaming General Discussion 05 July 2020, 19:47
Replies: 90
Views: 2,617
Posted By ross
Probably I remember badly and can be wrong (maybe...

Probably I remember badly and can be wrong (maybe later I check some old docs) but is not the GUS with a 'local' ram for DMA and free period selection for samples (then internal multi-voice mixing...
Forum: Retrogaming General Discussion 05 July 2020, 19:41
Replies: 90
Views: 2,617
Posted By ross
If 'by design' you mean some form of DAC yes. For...

If 'by design' you mean some form of DAC yes. For how is implemented a big NO.

Back to the example of apples and oranges .. the two DAC approach are both fruits, with characteristics that they...
Forum: Coders. General 05 July 2020, 16:13
Replies: 12
Views: 757
Posted By ross
It depends on how the Amiga architecture works. ...

It depends on how the Amiga architecture works.

To put it simply (it is more complex than that, but it is to give a general idea): with 6 bitplanes the processor access to shared memory (chip ram)...
Forum: Retrogaming General Discussion 05 July 2020, 15:56
Replies: 90
Views: 2,617
Posted By ross
Well, SID is from a different era and with...

Well, SID is from a different era and with different approach to audio.
And is not 'limited', features on SID are great considering where it was intended.

But I'm biased, I love SID ;)
Forum: Retrogaming General Discussion 05 July 2020, 15:38
Replies: 90
Views: 2,617
Posted By ross
I disagree here. It is absolutely not 'rather...

I disagree here.
It is absolutely not 'rather basic'. The tons of cheap/internal PC audio cards are rather basic...

Paula's design may also be 'simplistic', but the combination of a versatile...
Forum: Coders. Asm / Hardware 05 July 2020, 14:18
Replies: 40
Views: 2,395
Posted By ross
You are right :great EDIT: this is the...

You are right :great


EDIT: this is the effect of not having a coffee after a hearty Sunday meal :D
Forum: Coders. Asm / Hardware 05 July 2020, 14:00
Replies: 40
Views: 2,395
Posted By ross
Hi Keir, this is a nice solution :) Only two...

Hi Keir, this is a nice solution :)

Only two notes:
- it's pretty safe to exclude the tst.l d1; (even if the trap is called, the addq.l #4,2(sp) cannot set bit31 because >2GB code position is...
Forum: Coders. Asm / Hardware 04 July 2020, 13:00
Replies: 7
Views: 278
Posted By ross
No, this do not work. All custom registers...

No, this do not work.

All custom registers are 16 bits and if you write only a byte you have different result in different machines.

Writing on odd address on volume register work because (on...
Forum: Coders. Asm / Hardware 04 July 2020, 00:35
Replies: 6
Views: 205
Posted By ross
:great

:great
Forum: Coders. Asm / Hardware 04 July 2020, 00:19
Replies: 6
Views: 205
Posted By ross
Should work. I can only help you by debugging...

Should work.
I can only help you by debugging the executable..
Forum: Coders. Asm / Hardware 04 July 2020, 00:08
Replies: 7
Views: 348
Posted By ross
Works for the described setup but.. you're...

Works for the described setup but.. you're calling for trouble in fast Amigas.
If you can, use blitter wait :)
Forum: Coders. Asm / Hardware 03 July 2020, 23:57
Replies: 6
Views: 205
Posted By ross
Hi Leonard, nothing special on SOFT IRQ, the...

Hi Leonard, nothing special on SOFT IRQ, the difference is that can only be triggered by the processor or the copper, unlike the others that are triggered also by external events.
Could you post a...
Forum: News 03 July 2020, 14:35
Replies: 30
Views: 1,863
Posted By ross
Thanks Toni! - New easy to use and...

Thanks Toni!



- New easy to use and transparent printf()-like debug logging method for developers: simply write parameters to address $bfff00 (byte, word and long accepted) one by one, then...
Forum: support.Hardware 03 July 2020, 14:29
Replies: 55
Views: 1,176
Posted By ross
This second button thing is always complicated :)...

This second button thing is always complicated :)

Could you try this? http://eab.abime.net/showpost.php?p=1351611&postcount=1520

Or simply the latest Rygar AGA version.

EDIT: just to see if...
Forum: support.Hardware 02 July 2020, 16:55
Replies: 4
Views: 288
Posted By ross
Into The Zone!

Into The Zone!
Forum: Coders. Asm / Hardware 02 July 2020, 16:25
Replies: 4
Views: 487
Posted By ross
Not that I know, but it would be really useful to...

Not that I know, but it would be really useful to have some visual tools (possibly in cross-development) for the management of the real-time color changes made with the copper on the...
Forum: Amiga scene 01 July 2020, 20:47
Replies: 149
Views: 35,738
Posted By ross
Removed, it's out of place :) Sorry.

Removed, it's out of place :)

Sorry.
Forum: Amiga scene 01 July 2020, 18:01
Replies: 149
Views: 35,738
Posted By ross
Removed, it's out of place :) Sorry.

Removed, it's out of place :)

Sorry.
Forum: support.WinUAE 30 June 2020, 19:57
Replies: 14
Views: 1,330
Posted By ross
Ok :) You know it, it's really a lot easier for...

Ok :)
You know it, it's really a lot easier for me to discuss technical issues, algorithms and code, than to write well in English.

Thanks for your patience :great
Showing results 1 to 40 of 2632

 
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