550MHz G4 PowerBook (Pismo vs Titanium)

[Phipli]

According to AI (not the best source) the Archimedes could playback eight 8bit audio channels, not eight 16bit channels. To get 16bit it had to combine multiple 8bit channels. Additionally, the mixing was done in software so there was an overhead that made 4 channels of 16bit 44.1khz difficult if not impossible.

The above is not validated by real research, but I didn't lead it, I asked it to explain multi channel audio on the arch to me.

 

[Snial]

This is not quite what this means you're kind of mixing hardware and software - the DigiDesign extract is taking about physical hardware outputs, but you're talking about the platforms ability to mix playback channels.

It’s really more like I’m imagining how DAW type editing could be done with more limited hardware: multiple tracks would get mixed in software in non-realtime. I’m not claiming that’s how Digidesign did it.

Also, surely the Acorn can't play 8 tracks of CD quality at once? Or do you just mean 8 tracks of audio of any quality?

ok I understand, CD kHz, but only 8-bit uLaw quality.

 

[Trash80toHP_Mini]

I just got crosseyed reading what's gone on in this thread! If you're talking DAW, check out OS9 Lives. It's more G4 era oriented than G3, but a fun gang nonetheless.

 

[herd]

I had one sitting around, so for grins I put an 800MHz 750F CPU into the Pismo. The firmware reports the speed incorrectly (as with the 750G), but OS X does not need a patch to run. I keep hoping someone with one of the Powerlogix upgrades will chime in with a firmware dump!

 

[CC_333]

I've kind of been wanting to upgrade my Pismo with a G4 or fast G3 off and on since I first learned of the idea back 2009 or so.

I've never really bothered to look too hard, though, because I figure I won't be able to afford it anyway.

c

 

[herd]

I could not get CPU Director to change speed using the dual PLL options, and Reggie SE will not let me do it either (it can only read registers I guess). However, I found a utility in the Powerlogix folder called plxsetspr that does let me make changes. So the dual PLLs are working!

There is also an eeprom utility in there. I wonder if that could be used to easily try different edits to the ROM. There is no documentation though. Maybe it could be tested in an emulator to figure out what it does. It could be much easier than using flashrom or open firmware.