Great to see the Petunia in action. I didn't know about the PET-Tune-Ya origins of the name; makes sense it would start with a bad pun.

Nice that you found the original board! I always thought I'd make a reproduction of it (please not only resistors though!), but you know, some projects are delayed forever....

Wow! This is amazing and sounds great! I never knew the PET was so capable of such sounds. Thank you for sharing!

What the world needs is a determined soul willing to spend the effort to write a translator program to turn Orchestra 80/85/90 music (a similar simple DAC for the TRS-80 family of computers) into Petunia tunes. There's a *lot* of Orchestra 90 stuff floating around out there, and it sounds pretty similar to this.

What about making an IEEE-488 "sound card" with either a SID or Yamaha chip? I feel the interface is so underutilized. There could be a real time clock device number too.

Excellent product and video Do you happen to have the schematics for the PETunia with both audio and video out?

@HutchCA

2 жыл бұрын

The audio side schematic is in the manual. (link above) but I haven't located a schematic for the video side specific to the Petunia. There is a common composite video adapter though that should be similar enough. Google "commodore pet composite"

@RudysRetroIntel

2 жыл бұрын

@@HutchCA Thanks. I've found several schematics but not for the PETunia. Thanks foe your help

This is very interesting in that the sound is almost the same as that of the (later?) Tandy coco/dragon 32. I wonder if they used the same process? It was odd because you only got one channel in basic, but in machine code multiple voices were possible. But that sound is so very similar. I suppose this would be output from the 6520, the coco uses a 6821 which in essence is the same chip. I must look out the schematic. Thanks for sharing:)

Wow! That is really cool!

@8_Bit

2 жыл бұрын

​@@HutchCA It does have a really nice organ-like sound, but there's no way to configure it to produce other sounds, right? The SID is a lot more versatile even if it's not able to make as nice of an organ sound.

@RetroWK

2 жыл бұрын

@@HutchCA What always amazes me is with what (relatively) little hardware effort people created great products in the 70s and 80s. I have a PET book by C. Lorenz called Programmier Handbuch (german) which has something similar in there. Do you know that book? It's from Hofacker Verlag. I can scan it, if anybody wants it ... but it's in german. .. the listings are still in BASIC ;-)

@jimdinunzio

2 жыл бұрын

@@8_Bit It seems there is a way to produce other sounds by replacing the 256 byte waveform table in data statements that is poked into memory. This is covered in the manual.

Thanks for showing this obscure device. :) I find it a bit strange that there were only versions for BASIC 1.

Somehow the music doesn't play on my phone :/

@dominikschutz6300

2 жыл бұрын

@@HutchCA Odd :/ Well, mine is a Samsung Galaxy A7 :)

Very good! Didn't know that existed. Excellent video. Do you know where the schematics are located? Would like to build one with external monitor support

@cathrynm

2 жыл бұрын

Me neither. This sounds okay, actually.

@cathrynm

2 жыл бұрын

@@HutchCA I suppose the improvement in audio is the resistor network. That the other sound you played was a square wave, whereas this thing can control the weveforms better.

The parts with direct audio recording around 8 minutes or so are silent. Copyright strike?