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Forum: Coders. Asm / Hardware 26 January 2021, 12:29
Replies: 1,119
Views: 76,836
Posted By bloodline
It seems the real reason may be lost to history,...

It seems the real reason may be lost to history, it was always my understanding that the reason the 8086 was chosen for the original IBM-PC was that IBM already had a contract with Intel to supply...
Forum: Coders. Asm / Hardware 22 January 2021, 11:34
Replies: 4
Views: 902
Posted By bloodline
Hmmm, I’m having difficulty following the...

Hmmm, I’m having difficulty following the traces... I assume the analog section would be isolated from the digital section to reduce noise, so that would explain the apparent “gap” near the pads.
...
Forum: Coders. Asm / Hardware 20 January 2021, 12:39
Replies: 4
Views: 902
Posted By bloodline
Paula Internal Logic

There have been a few fascinating threads recently about the Amiga's audio generation system, and we've had some great insights from people who have taken the time to probe the various outputs from...
Forum: Coders. Asm / Hardware 14 January 2021, 19:06
Replies: 234
Views: 20,966
Posted By bloodline
That’s interesting, so the A1200 really is the...

That’s interesting, so the A1200 really is the odd one out! Has anyone got the CD32 schematics to check what the output filter is on there?

The A1200 cap rating is something like an order of...
Forum: Coders. Asm / Hardware 14 January 2021, 00:43
Replies: 234
Views: 20,966
Posted By bloodline
10bit equivalent SNR is inline with my...

10bit equivalent SNR is inline with my observation using the Amiga for professional audio recording.



Someone posted your write up a few days ago, it was a very enjoyable read!
Forum: Coders. Asm / Hardware 13 January 2021, 20:07
Replies: 234
Views: 20,966
Posted By bloodline
Yeah, I’ll go with you on that. Probably too many...

Yeah, I’ll go with you on that. Probably too many variables when subranging Paula to be super precise.



If I hadn’t tried to get my A1200 to play 16bit audio using this method back when I was...
Forum: Coders. Asm / Hardware 13 January 2021, 08:30
Replies: 234
Views: 20,966
Posted By bloodline
I remember watching this a while back, it’s a...

I remember watching this a while back, it’s a nice comparison (though I’m not sure the choice of reference track was particularly helpful), also I think the mpeg compression is clearly evident (but...
Forum: Coders. Asm / Hardware 13 January 2021, 00:39
Replies: 234
Views: 20,966
Posted By bloodline
Yeah, 12bit is just enough to keep the noise...

Yeah, 12bit is just enough to keep the noise below normal hearing, and certainly well below any music mix.

I still have a Roland W-30 here which uses 12bit sampling and it’s difficult to tell it...
Forum: Coders. Asm / Hardware 12 January 2021, 17:48
Replies: 234
Views: 20,966
Posted By bloodline
Excellent experiment! And I appreciate the time...

Excellent experiment! And I appreciate the time you have taken to test this.

I think you are being a little generous suggesting that the output is approximately to 11bit, I would suggest it is...
Forum: Coders. System 10 January 2021, 16:03
Replies: 17
Views: 2,596
Posted By bloodline
My guess would be there are issues related to how...

My guess would be there are issues related to how early it has to be brought up in the boot sequence, i.e. before Dos I assume.
Forum: Coders. Asm / Hardware 06 January 2021, 13:04
Replies: 323
Views: 17,958
Posted By bloodline
I've always thought that the graphics.library was...

I've always thought that the graphics.library was a mess! It's reassuring to know I'm not the only one.

I never really understood the relationship between layers, graphics, and intuition, they all...
Forum: Coders. Asm / Hardware 03 January 2021, 20:13
Replies: 323
Views: 17,958
Posted By bloodline
The shower manufacturer was kind enough to...

The shower manufacturer was kind enough to install handles, a grippy texture on the floor, sunken water channels to the drain, and a helpful sign warning about the dangers of wet floors, in five...
Forum: Coders. Asm / Hardware 03 January 2021, 18:52
Replies: 323
Views: 17,958
Posted By bloodline
You know that’s not how Internet forums work! ...

You know that’s not how Internet forums work!

4am: “Sorry honey, I can’t come to bed, someone on the Internet is wrong...”



And you are proving that things don’t suddenly become true by...
Forum: Coders. Asm / Hardware 03 January 2021, 16:56
Replies: 323
Views: 17,958
Posted By bloodline
Apologies then, I don’t think I’ve understood...

Apologies then, I don’t think I’ve understood what you did to test the audio.

No, a 2pole LP filter has a pretty shallow attenuation slope, certain nothing as aggressive as an 8pole, which I...
Forum: Coders. Asm / Hardware 03 January 2021, 14:52
Replies: 323
Views: 17,958
Posted By bloodline
Off the top of my head, I would guess that, if...

Off the top of my head, I would guess that, if you don’t hear aliasing when playing back audio files on the Amiga (doing whatever tricks you need to do), which do exhibit aliasing on you PC, then...
Forum: Coders. Asm / Hardware 03 January 2021, 13:51
Replies: 323
Views: 17,958
Posted By bloodline
That’s an interesting perspective, I don’t see...

That’s an interesting perspective, I don’t see this as an Amiga vs PC thread. But more of discussion regarding the denial of the characteristics which make the Amiga Audio interesting.

The Amiga...
Forum: Coders. Asm / Hardware 03 January 2021, 11:44
Replies: 323
Views: 17,958
Posted By bloodline
Rather, I’m running out of different ways to say...

Rather, I’m running out of different ways to say the same thing.



Fun fact, quite often audio generation was actually 12bit (The actual output DAC would have a 16bit resolution, the 12bit...
Forum: Coders. Asm / Hardware 02 January 2021, 19:45
Replies: 323
Views: 17,958
Posted By bloodline
I’m not that insecure, I freely admit that I’ve...

I’m not that insecure, I freely admit that I’ve misunderstood how somethings have worked for years, this sort of thing happened all the time when I was younger and tended to use observed behaviour...
Forum: Coders. Asm / Hardware 02 January 2021, 12:06
Replies: 323
Views: 17,958
Posted By bloodline
But the Amiga, like all hardware, is designed and...

But the Amiga, like all hardware, is designed and built to a specification. It is never going to exceed that specification. There is no magic, if you want to try and increase the dynamic range (8bit...
Forum: Coders. Asm / Hardware 02 January 2021, 11:42
Replies: 323
Views: 17,958
Posted By bloodline
It’s certainly possible I have misunderstood how...

It’s certainly possible I have misunderstood how some parts of the Amiga’s Audio works. Actually I think you have misunderstood how the Amiga works, but if the misunderstanding is non critical and...
Forum: Coders. Asm / Hardware 02 January 2021, 10:08
Replies: 323
Views: 17,958
Posted By bloodline
The Amiga doesn’t have any options... you only...

The Amiga doesn’t have any options... you only get to use the same old early ‘80s audio or nothing.

With any modern audio chip, you can choose.



That is totally unfair misquote. I said...
Forum: Coders. Asm / Hardware 01 January 2021, 21:28
Replies: 323
Views: 17,958
Posted By bloodline
Actually you could probably output a higher...

Actually you could probably output a higher frequency than that... I originally wrote “limited bandwidth”, but it didn’t sound as good as what I ended up writing.



I happen to like the Amiga’s...
Forum: Coders. Asm / Hardware 01 January 2021, 20:49
Replies: 323
Views: 17,958
Posted By bloodline
You hand waved away my long list of issues with...

You hand waved away my long list of issues with audio reproduction as performed by the Amiga. I’m trying to do you the courtesy of not doing the same to you. But you struggle to see that what you are...
Forum: Coders. Asm / Hardware 01 January 2021, 16:39
Replies: 323
Views: 17,958
Posted By bloodline
Perhaps too much... My point is that...

Perhaps too much...



My point is that PC or Amiga, your audio buffer is being resampled. The DAC operates at a single conversion rate. You just get more options on a modern computers.


...
Forum: Coders. Asm / Hardware 01 January 2021, 15:33
Replies: 323
Views: 17,958
Posted By bloodline
Your English is great, but I always worry that...

Your English is great, but I always worry that subtleties are lost when discussing technical matters.



My point was to try and explain that using the DMA channel as an instrument is very...
Forum: Coders. Asm / Hardware 01 January 2021, 14:51
Replies: 323
Views: 17,958
Posted By bloodline
AFAIK paula is essentially using a Sigma-delta...

AFAIK paula is essentially using a Sigma-delta DAC technique... so you will need a reconstruction filter regardless


It’s not 14bit... it’s going to have a better dynamic range than the normal...
Forum: Coders. Asm / Hardware 01 January 2021, 13:35
Replies: 323
Views: 17,958
Posted By bloodline
I feel like I’m being trolled. Perhaps my use of...

I feel like I’m being trolled. Perhaps my use of langue is an issue? But, I’m sorry to say my French is abysmal, so I have to use English, and I’m honestly embarrassed by this fact.



I’m not...
Forum: Coders. Asm / Hardware 01 January 2021, 11:32
Replies: 323
Views: 17,958
Posted By bloodline
Indeed... and that was rather my point. ...

Indeed... and that was rather my point.



“Overlap of samples”, when a new samples plays the old one stops. Not cleanly with a fade to 0, but a hard stop, the Paula DAC might go from 127 to...
Forum: Coders. Asm / Hardware 01 January 2021, 10:02
Replies: 323
Views: 17,958
Posted By bloodline
“Just a theory”... I suppose you don’t believe in...

“Just a theory”... I suppose you don’t believe in gravity either? The quality of the Amiga audio is acceptable to people like us who want that audio character... but it is essentially useless now for...
Forum: Coders. Asm / Hardware 31 December 2020, 21:42
Replies: 323
Views: 17,958
Posted By bloodline
All of what I listed make the Amiga Audio totally...

All of what I listed make the Amiga Audio totally unacceptable in 2021.




Ok, attached... This code was written in a few hours one evening as a placeholder for a game engine I was contracted...
Forum: Coders. Asm / Hardware 31 December 2020, 18:33
Replies: 4
Views: 600
Posted By bloodline
I’m not sure if it is of any help to you, but I...

I’m not sure if it is of any help to you, but I wrote some code to covert an ADF image into a raw mfm stream, for my emulator. You should be able to see what is needed to turn a raw MFM Amiga track...
Forum: Coders. Asm / Hardware 31 December 2020, 10:35
Replies: 323
Views: 17,958
Posted By bloodline
Doing 56Khz on the Amiga, burns both CPU and...

Doing 56Khz on the Amiga, burns both CPU and Chipram bandwidth!! Far more than any mixing algorithm!



Ok, the Amiga’s “14bit playback” is definitely not 14bit. You need to take into account the...
Forum: Coders. Asm / Hardware 31 December 2020, 10:14
Replies: 323
Views: 17,958
Posted By bloodline
I’m not sure I can even parse what you are saying...

I’m not sure I can even parse what you are saying here... Thomas has clearly stated, and explained why, it doesn’t matter what hardware you have installed.

You are making an assertion that is...
Forum: Coders. Asm / Hardware 30 December 2020, 18:43
Replies: 323
Views: 17,958
Posted By bloodline
I’m really not sure where you are getting your...

I’m really not sure where you are getting your information from. Audio mixing is a relatively simple and well understood process, where the mathematical model of adding waveforms matches the physical...
Forum: Coders. Asm / Hardware 29 December 2020, 19:06
Replies: 323
Views: 17,958
Posted By bloodline
Depends upon how much fun you have with it!...

Depends upon how much fun you have with it! :great

I worry we are just arguing semantics here. I have no negative connotation with my use of the word toy. I’m just using it to describe something...
Forum: Coders. Asm / Hardware 29 December 2020, 18:45
Replies: 323
Views: 17,958
Posted By bloodline
I’ve never used resources, but... I think...

I’ve never used resources, but...


I think we are now back where we started. The application programmer should not have access to the Interrupts. Doing so breaks even the simple Supervisor/User...
Forum: Coders. Asm / Hardware 29 December 2020, 17:31
Replies: 323
Views: 17,958
Posted By bloodline
I’m not sure CIA-B’s Interrupt is exposed via the...

I’m not sure CIA-B’s Interrupt is exposed via the OS... well, actually given how AmigaOS allows a task to do pretty much anything, you can use it... but this is just an example of how insecure the OS...
Forum: Coders. Asm / Hardware 29 December 2020, 16:18
Replies: 323
Views: 17,958
Posted By bloodline
I would guess that it is using the CIA then, and...

I would guess that it is using the CIA then, and that is on a pretty low priority IRQ... Which will have a fair bit of jitter in its timing.

Also it’s relatively easy to to get low latency...
Forum: Coders. Asm / Hardware 29 December 2020, 14:35
Replies: 323
Views: 17,958
Posted By bloodline
Only if you are a masochist... :D Toys are...

Only if you are a masochist... :D Toys are supposed to be fun.
Forum: Coders. Asm / Hardware 29 December 2020, 14:34
Replies: 323
Views: 17,958
Posted By bloodline
Low latency is a much better term to describe...

Low latency is a much better term to describe what you are talking about. But the Amiga is pretty crappy for low latency. I forget what the scheduler quantum default is for exec, but I think it was 4...
Showing results 1 to 40 of 360

 
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