ACA1230/56 - what's the deal?

[Crumb]

I want my Amiga to be capable of playing stereo MP3s, at the moment I can just manage mono.

A 030 won't be enough to play 44Khz 128kbit MP3 in stereo. You would need a 060 in order to do that comfortably.

[LaserBack]

A 030 won't be enough to play 44Khz 128kbit MP3 in stereo. You would need a 060 in order to do that comfortably.

you don't need a 060...a 040/25mhz can play mp3 in a perfect way

[Crumb]

you don't need a 060...a 040/25mhz can play mp3 in a perfect way

What do you understand as "perfect"? 22Khz is not "perfect" for me. With a 040/40 you'll reach 44Khz mono without problems but for usual 128kbit, 44Khz MP3 you'll need a 060 (and it will have plenty of power remaining available, I used to record CDs from mp3 at almost 2x IIRC)

[LaserBack]

What do you understand as "perfect"? 22Khz is not "perfect" for me. With a 040/40 you'll reach 44Khz mono without problems but for usual 128kbit, 44Khz MP3 you'll need a 060 (and it will have plenty of power remaining available, I used to record CDs from mp3 at almost 2x IIRC)

on a 040/25 you will reach 22khz stereo.. it is not perfect but sounds very well
anyways on a 040/40 overclocked to 50mhz will reach idem speed of the 060/50  
so your argument is not valid ...lol

[Crumb]

on a 040/25 you will reach 22khz stereo.. it is not perfect but sounds very well
anyways on a 040/40 overclocked to 50mhz will reach idem speed of the 060/50  
so your argument is not valid ...lol

22Khz doesn´t sound "very well" IMHO. Standard 040/40 certainly isn´t enough for playing 44Khz Stereo MP3. So if you want 44Khz Stereo MP3 you´ll need MORE than a 040/40: a 060 (OK, an overclocked 040/40 running at 50Mhz may be enough according to you but most 040/40 run fairly hot and although I know overclocked 040/50 exist I never used one)

[NovaCoder]

I've got at 1230/56 and I'm currently using Amplifier to play back MP3's via AHI (14 bit stereo FAST mode).

What kind of bit rate should I be using to encode the MP3's for my setup?  I grabbed a couple of 256kb ones ripped by Media Center on my PC and they sound pretty nasty.

[Retrofan]

I think what we need is another batch of Mas Players.
 
I would like to have one to play Mp3's with my ACA 1230/56 also.

[Crumb]

I've got at 1230/56 and I'm currently using Amplifier to play back MP3's via AHI (14 bit stereo FAST mode).

What kind of bit rate should I be using to encode the MP3's for my setup?  I grabbed a couple of 256kb ones ripped by Media Center on my PC and they sound pretty nasty.

Higher bitrate will require more cpu power (I guess) so try with 96-128kbits and 22khz stereo. It will sound pretty bad but at least your 030 will do it more comfortably. Try mpega.library replacement "libcamd", it´s supposedly faster. For AHI I used to like the 28Khz DMA 8bit mode (although it crashed sometimes I think) but if you want to avoid some resampling configure AHI to use the same output frecuenzy you use with Amplifier.


@retrofan
IIRC german folks from a1k.org produced a small batch, it would be nice if somebody found a batch of chips. It was a cool way to play mp3 with our miggies. Delfina is another solution

[NovaCoder]

Cool thanks, I'll give that a try

[LaserBack]

like said Crumb higher bitrates requires more cpu power
you can try to encode at 64 kpbs which sounds pretty well...it will require less cpu power...also the mp3 file will be small
also amplifier it is a bad mp3 player for a 030...eats lot of cpu power
for 030 I recommend songplayer or splayer both in aminet

[LaserBack]

22Khz doesn´t sound "very well" IMHO. Standard 040/40 certainly isn´t enough for playing 44Khz Stereo MP3. So if you want 44Khz Stereo MP3 you´ll need MORE than a 040/40: a 060 (OK, an overclocked 040/40 running at 50Mhz may be enough according to you but most 040/40 run fairly hot and although I know overclocked 040/50 exist I never used one)[/QUOTE

yes the 040/40 can be overclocked to 50 mhz using a 100mhz crystal and adding a biggest fan
it reach idem speed of the 060/50 mhz on integer... about 39 mips on sysinfo and of course you can play mp3 at full speed
the fpu also overclocks but remains a bit slower than the 060...the 060 have a faster fpu module

[utri007]

With Delfina lite is possible to MP3s quite nicely with 030.

Delfina would be better option than masplayer, it has much more use.

[Crumb]

@laserback

do you know what are the best 040/40 revisions? I have a WarpEngine and I guess it would fly at 50Mhz but it already gets pretty hot.

Yeah, SongPlayer is a very nice player. It requires less resources than AmigaAmp.

@Novacoder

If you use Amplifier configure it to use Paula (it's x-audio option IIRC) instead of AHI, as it's usually faster than AHI.

@utri007

is the software stable?

[utri007]

It has worked fine with my amigas.

There was some additional things to do to get it work stable, but I don't remember what.

http://aminet.net/package/mus/play/dmdev

-plays MPEG audio files with almost no CPU load
   (Delfina's DSP56002 does all the decoding and playback)

[LaserBack]

@laserback

do you know what are the best 040/40 revisions? I have a WarpEngine and I guess it would fly at 50Mhz but it already gets pretty hot.

?

I done the overclock long time ago on the apollo 1240/40 and I can't remember the revision but I'm sure it was an old 040 revision cause the most recent 040 does not requires fan
maybe the biggest problem you will find on your warp engine is to found compatible memory simms with the overclock...I remember that not all memory simms worked well with the overclock...I tried some 16mb memory simms until I find one that worked fine
I calculated that only the fastest simms will work....edo or 60ns simms

[jj]

That's probably due to the fact that Freescale (who I believe purchased the chip fab from Motorola) only manufacture the chip in sets of 10,000 and the 68030 and below are marked as "discontinued", per unit price depending upon model is ~$100. I guess resellers/trade sellers have to get their markup somehow.

 
I think that Motorola just split its chip fabrication devision off from the company can called it freescale ?