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Forum: Coders. General Today, 19:21
Replies: 100
Views: 1,998
Posted By meynaf
What happens actually is that whatever system...

What happens actually is that whatever system component, or even end user applications, use some exec.library functions to get into supervisor mode. This in turn uses privilege violation exception to...
Forum: Coders. General Today, 17:22
Replies: 100
Views: 1,998
Posted By meynaf
It mirrors reset vector from ROM - which means it...

It mirrors reset vector from ROM - which means it can not be altered in any manner. Also, being in low mem, it's protected from usermode access even when reading.
The hardware itself is made this...
Forum: Coders. General Today, 15:12
Replies: 100
Views: 1,998
Posted By meynaf
I think you misunderstood me. I'm not calling...

I think you misunderstood me. I'm not calling PDOS an Amiga emulator. But you intend to run Amiga version of PDOS on an emulator. The point is, you don't really need an Amiga emulator, you could run...
Forum: Coders. Asm / Hardware Today, 13:36
Replies: 4
Views: 202
Posted By meynaf
If you need to add a negative number without...

If you need to add a negative number without getting a carry, you can just use SUB (with a positive number).
Forum: Coders. General Today, 13:32
Replies: 100
Views: 1,998
Posted By meynaf
Because you need a working AmigaOS to be able to...

Because you need a working AmigaOS to be able to access the hard drive, for the reasons Thomas mentioned. No AmigaOS, no hard drive.



But then the Amiga emulator isn't needed anymore. Why not...
Forum: Coders. General Today, 11:37
Replies: 100
Views: 1,998
Posted By meynaf
Booting an Amiga without kickstart requires quite...

Booting an Amiga without kickstart requires quite a lot of init code. I don't think it's worth going into.



That's what many games do : take over upon startup.
Still, there is a lot to do...
Forum: Coders. General Today, 09:48
Replies: 100
Views: 1,998
Posted By meynaf
I think that if you want to access the hard...

I think that if you want to access the hard drive, you need a working kickstart.
Otherwise you're gonna make your life more complex and be limited to single Amiga model.
But this has some benefits....
Forum: project.EAB 03 March 2021, 16:37
Replies: 7
Views: 184
Posted By meynaf
This is not new but nothing has been done about...

This is not new but nothing has been done about it so far. This mode is very buggy and the first thing i do when posting is to disable it.
Forum: Amiga scene 01 March 2021, 09:53
Replies: 46
Views: 1,806
Posted By meynaf
This is a disk cache, nothing to do with amiga's...

This is a disk cache, nothing to do with amiga's ram disk.
Forum: Coders. General 01 March 2021, 08:51
Replies: 14
Views: 469
Posted By meynaf
Normally you shouldn't need to set FMODE...

Normally you shouldn't need to set FMODE yourself. The OS does. It will use 4x even on lowres modes.
This only requires AGA modes to be activated, which is done upon startup by SetPatch command.
Forum: Coders. Asm / Hardware 26 February 2021, 10:26
Replies: 4
Views: 391
Posted By meynaf
It's not possible to play Protracker by just...

It's not possible to play Protracker by just using audio.device. It's too limited.
A few other formats such as Maxtrax can be played, but audio.device has a tendency to miss notes on accelerated...
Forum: Amiga scene 25 February 2021, 09:24
Replies: 46
Views: 1,806
Posted By meynaf
What has already been mentioned above. The RAM...

What has already been mentioned above.
The RAM disk that is always there.
The "enter command and its arguments" popup from double-clicking an iconless data file.
Fast booting.
No shutdown...
Forum: Coders. Asm / Hardware 23 February 2021, 21:06
Replies: 1,089
Views: 61,202
Posted By meynaf
One sure thing is that this thread leads nowhere....

One sure thing is that this thread leads nowhere.
However, our friend litwr here is a strange guy. He writes a lot of drivel all day long, but hardly ever goes into real name calling. This is...
Forum: Coders. Asm / Hardware 23 February 2021, 16:23
Replies: 1,089
Views: 61,202
Posted By meynaf
Very nice : sometimes 68020 is faster than...

Very nice : sometimes 68020 is faster than similar clocked 80386 in this example. :laughing



You are saying the same things over and over, but it will not make them more true.



This is...
Forum: Coders. Asm / Hardware 22 February 2021, 10:21
Replies: 1,089
Views: 61,202
Posted By meynaf
Now that's another story. If you want SR and CCR...

Now that's another story. If you want SR and CCR to be completely different registers, you have to know that saving/restoring a second register for interrupts/exceptions would have cost extra cycles...
Forum: Coders. Asm / Hardware 15 February 2021, 19:17
Replies: 51
Views: 2,662
Posted By meynaf
Another possibility for the c2p-style approach : ...

Another possibility for the c2p-style approach :

; data and result in d4

; enter here for 32-bit bit reverse
ror.b #4,d4
ror.w #8,d4
ror.b #4,d4
swap d4
Forum: Coders. Asm / Hardware 15 February 2021, 11:13
Replies: 1,089
Views: 61,202
Posted By meynaf
Your two sentences here contradict each other. ...

Your two sentences here contradict each other.
If 68000 had to have separate instruction to read system flags and a normal one to read arithmetic flags, then it means it should have privileged move...
Forum: Coders. Asm / Hardware 12 February 2021, 14:50
Replies: 234
Views: 13,992
Posted By meynaf
One can not resample without adding noise. The...

One can not resample without adding noise. The used method only changes the amount.
Forum: Coders. Asm / Hardware 12 February 2021, 13:30
Replies: 234
Views: 13,992
Posted By meynaf
Maybe always, but PC will resample at 44100,...

Maybe always, but PC will resample at 44100, Amiga at 3546895. So less on one side.
This has nothing to do with nyquist theorem. You test uses 1/100th of sampling frequency, not 1/2.
Anyway,...
Forum: Coders. Asm / Hardware 12 February 2021, 11:02
Replies: 234
Views: 13,992
Posted By meynaf
On the PC, yes.

On the PC, yes.
Forum: Coders. Asm / Hardware 12 February 2021, 10:18
Replies: 234
Views: 13,992
Posted By meynaf
This is what I suspected, hence the need for...

This is what I suspected, hence the need for testing with lower frequencies.
Forum: Coders. Asm / Hardware 11 February 2021, 11:16
Replies: 296
Views: 10,159
Posted By meynaf
You can at least count on me. I already have all...

You can at least count on me. I already have all the relevant framework in my flac player (http://eab.abime.net/showthread.php?t=91092).
Forum: Coders. Asm / Hardware 10 February 2021, 12:02
Replies: 296
Views: 10,159
Posted By meynaf
But if this is Agnus timings that give the phase...

But if this is Agnus timings that give the phase shift, it becomes known. As data is obtained at fixed times.
And if not, then we can attempt to alter it.
So it all boils down to knowing what...
Forum: Coders. Asm / Hardware 10 February 2021, 11:41
Replies: 296
Views: 10,159
Posted By meynaf
We can attempt to guess it from current knowledge...

We can attempt to guess it from current knowledge of how the audio works, and then eventually verify by measuring and/or experimenting.
When is the period internal counter reset ? It could be by...
Forum: Coders. Asm / Hardware 10 February 2021, 11:31
Replies: 296
Views: 10,159
Posted By meynaf
Well, that depends how often we have to do this....

Well, that depends how often we have to do this. If only once at startup, it is acceptable.



For a player you need to convert the sound real time and it includes resampling as the method...
Forum: Coders. Asm / Hardware 10 February 2021, 11:18
Replies: 296
Views: 10,159
Posted By meynaf
For an audio player it is somehow ok. Anyway,...

For an audio player it is somehow ok.
Anyway, only one of the two ideas is cpu intensive.



Well, where does the phase shift come from at first place ?
If it is DMA that feeds 0,1,2,3 in that...
Forum: Coders. Asm / Hardware 10 February 2021, 10:46
Replies: 296
Views: 10,159
Posted By meynaf
Random ideas : - set the period to 1 to clear...

Random ideas :
- set the period to 1 to clear the internal counter, then use copper to setup periods so we can know (maybe set ?) the phase shift
- use the cpu instead of the dma to write to...
Forum: Coders. Asm / Hardware 07 February 2021, 19:32
Replies: 234
Views: 13,992
Posted By meynaf
I didn't say it had CD quality. As already...

I didn't say it had CD quality. As already pointed, this is a strawman fallacy.
Forum: Coders. Asm / Hardware 07 February 2021, 17:05
Replies: 234
Views: 13,992
Posted By meynaf
How 10 bit - played with 14bit routine - sounds...

How 10 bit - played with 14bit routine - sounds on the miggy ?
Have you considered checking 8 bit vs 8 bit, just to see if they are the same on both sides ?




Of course calibration does help...
Forum: Coders. Asm / Hardware 07 February 2021, 16:03
Replies: 234
Views: 13,992
Posted By meynaf
Still, it gives some extra combinations. I could...

Still, it gives some extra combinations. I could count the overall number of used ones i a few calibration files and these are used.



No, it's not designed to play 14 bit data, but at least you...
Forum: Coders. Asm / Hardware 07 February 2021, 15:48
Replies: 1,089
Views: 61,202
Posted By meynaf
We need something that's big enough so that it...

We need something that's big enough so that it shows the point where 68k starts to take over in matter of code density. Remember, x86 is good for this but only for small programs.



Doesn't...
Forum: Coders. Asm / Hardware 07 February 2021, 14:22
Replies: 234
Views: 13,992
Posted By meynaf
Sorry, i misread your first post. ...

Sorry, i misread your first post.



Sure, but this is what the calibration is for.



But it's not exactly a 14 bit quantizer. We have two 8-bit samples, that's 16 bits in total.
Forum: Coders. Asm / Hardware 06 February 2021, 21:33
Replies: 234
Views: 13,992
Posted By meynaf
You still can't be sure 100% of the noise you see...

You still can't be sure 100% of the noise you see actually comes from the Amiga. Even if it looks plausible. You used Marantz PM-80, it is an amplifier from early 90's which you cannot prove doesn't...
Forum: Coders. Asm / Hardware 06 February 2021, 20:10
Replies: 234
Views: 13,992
Posted By meynaf
Who knows ? Perhaps you made a mistake somewhere....

Who knows ? Perhaps you made a mistake somewhere.
It could be many things : bad Amiga config, Amiga hardware starting to fail due needed recap or removed shielding, bad PSU. Or just that you used a...
Forum: Coders. Asm / Hardware 06 February 2021, 18:06
Replies: 234
Views: 13,992
Posted By meynaf
I personnally wouldn't trust HippoPlayer too...

I personnally wouldn't trust HippoPlayer too much, nor would I trust SBLive's input and the used measurement method.
Forum: Nostalgia & memories 05 February 2021, 10:04
Replies: 33
Views: 6,251
Posted By meynaf
K240 is a great game indeed. I finished it many...

K240 is a great game indeed. I finished it many years ago but i don't remember much of the details. I once won by crashing my last asteroid into the enemy's last asteroid. To win the game you don't...
Forum: support.Games 04 February 2021, 12:08
Replies: 11
Views: 632
Posted By meynaf
I could, but these contain spoken text and the...

I could, but these contain spoken text and the only version i have is french version.
Forum: support.Games 04 February 2021, 10:30
Replies: 11
Views: 632
Posted By meynaf
Extra anims come from Heroes2x (Price of...

Extra anims come from Heroes2x (Price of Loyalty).
My own anim dir contains 178 files.



Strange, they aren't referenced in the code but are nonzero files in my version. Something to...
Forum: support.Games 03 February 2021, 23:54
Replies: 11
Views: 632
Posted By meynaf
MAC version does not have any anim. However I...

MAC version does not have any anim.
However I resurrected the anims so the Amiga version has all of them.



Below is full list of SMK referenced by the game :
CHOOSE
CHOOSEW
CREDITS
EARTH
Forum: support.Games 03 February 2021, 21:49
Replies: 11
Views: 632
Posted By meynaf
For some reason the Mac version had SMK animation...

For some reason the Mac version had SMK animation disabled. So of course anim files aren't there.
PC versions usually have all anims but Gold Edition is missing some.

In case something bad...
Showing results 1 to 40 of 4118

 
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