Hertz Overload - new demo for AGA Amigas

[saimo]

Originally Posted by pandy71

Something is wrong - this is regular interference

You just lost me
If it's regular interference, why is something wrong and why should samples be lost?

EDIT: Ah, I think I know what you mean now. Well, the explanation is simple: the data is being streamed from the mass storage device (a CompactFlash) at exact and regular intervals, hence the electrical interference. When the Workbench is loaded and AmigaOS is working normally, I can see similar interferences at intervals of 5 seconds.

[saimo]

AQA is officially released now: https://retream.itch.io/amiga-tools

Edit: forgot to mention that I swapped the AQA1 and AQA2 formats around and that the documentation is better now.

[pandy71]

Originally Posted by saimo

You just lost me
If it's regular interference, why is something wrong and why should samples be lost?

EDIT: Ah, I think I know what you mean now. Well, the explanation is simple: the data is being streamed from the mass storage device (a CompactFlash) at exact and regular intervals, hence the electrical interference. When the Workbench is loaded and AmigaOS is working normally, I can see similar interferences at intervals of 5 seconds.

Yes, this show that A1200 is quite poor in terms of audio quality... definitely need some attention - not sure if any of those revival PCB projects addressed this issue... probably not - wasted possibility to get decent audio quality.

[Karlos]

What condition are your capacitors in? As these things age and stop working properly, you get all kinds of unwanted background noise.

I noticed that one of the last times I used my system. I even have a capture of it somewhere that I was going to use for some glitch. I lost it in a HD crash but I remember the working title was "blittersong"

[saimo]

@pandy71

Originally Posted by pandy71

Yes, this show that A1200 is quite poor in terms of audio quality... definitely need some attention - not sure if any of those revival PCB projects addressed this issue... probably not - wasted possibility to get decent audio quality.

I wonder if other motherboard revisions behave the same.
As a general note,this one (rev. 1B), due to the CompactFlash adaptor, the harddisk LED flashes all the time, with varying intensity depending on what the machine is doing - for example, moving the mouse makes it flash brighter and with higher frequency. AmigaKit (where I bought the adaptor from) told me that it's a reknown problem of some motherboards. It doesn't bother me much, so I didn't look for a solution.

@Karlos

Originally Posted by Karlos

What condition are your capacitors in?

Replaced

[pandy71]

Originally Posted by saimo

@pandy71


I wonder if other motherboard revisions behave the same.
As a general note,this one (rev. 1B), due to the CompactFlash adaptor, the harddisk LED flashes all the time, with varying intensity depending on what the machine is doing - for example, moving the mouse makes it flash brighter and with higher frequency. AmigaKit (where I bought the adaptor from) told me that it's a reknown problem of some motherboards. It doesn't bother me much, so I didn't look for a solution.

CF card doesn't draw too much current, also ripples due activity should be lower - generally seem Paula is poorly decoupled from interferers - there is few threads on modifications but afraid it is impossible to deliver high quality without addressing circuitry similarly o CD32 or even better.

[saimo]

Originally Posted by pandy71

CF card doesn't draw too much current, also ripples due activity should be lower - generally seem Paula is poorly decoupled from interferers - there is few threads on modifications but afraid it is impossible to deliver high quality without addressing circuitry similarly o CD32 or even better.

After all, we're talking of a motherboard built in 1992/1993, with the audio chip designed in the first half of the 80ies, so we can't expect it to satisfy audiophiles' requirements

[pandy71]

Originally Posted by saimo

After all, we're talking of a motherboard built in 1992/1993, with the audio chip designed in the first half of the 80ies, so we can't expect it to satisfy audiophiles' requirements

Exactly - something that can be explained in 1984 or even 1987 then in 1992 can't be explained at all - this is clearly visible (audible) in CD32 - probably because application engineer from Sanyo (audio CD DAC is Sanyo made) proposed CD like approach to Paula so no worsening audio quality on CD path from added Paula part...