Yamaha PSS series keyboards.

[shimshon]

it looks like the pss-120 is virtually unbendable. i think it's sample based, not FM. shorting pins on the one chip inside, i only get sounds from the various instruments and drum presets. i did find one bend point which creates a feedback loop that's inaudible when the AC adapter is plugged in, but still combines with the instrument that you play and gives it a nice overdriven sound.

the keyboard itself has some decent sounds, but generally not worth buying if you're looking for glitchy goodness.

[shimshon]

anybody have any info on the yamaha psr-77? it's been sitting in my local thrift store for quite a while now (way overpriced, i'm waiting for them to pull it off the floor, knock down the price and then use my employee discount =]) but it looks pretty big and i generally stay away from the keyboards that are bigger than 25 keys for circuit bending... so has anyone tried one out?

[computer at sea]

Hell Yeah!

I found a beat up PSS 50 in the trash pile out at my practice space today.  The case is pretty destroyed but the keyboard seems to function as stock, though I can't really get my head around it just yet.  It has an 'ad lib' button, and it plays Hey Jude. 

Super jazzed to bend it tomorrow evening.  Details to follow.

[computer at sea]

Not so much success with the PSS 50...

I've found a couple of drum mods that aren't that special and nothing else so far.  I've been poking around with a 555 oscillator and that hasn't turned up anything either.

Speaking of PSS models and 555s, here's a link to a video of a PSS-6 with a 555 osc in it. 
http://www.youtube.com/watch?v=84VozcvseG8
€There's a diagram over here:
http://www.circuitbenders.co.uk/forum/index.php/topic,799.0.html (not really sure why I didn't post that in this thread)

[pudelko]

Is there anything that can be done with the PSS 80? Ive added an audio out cable in order to connect it to a mixer so far. Is there anything else worthwhile? Something similar to the PSS 140/270?

[computer at sea]

To check if there's a dataline mod available, look for a big chip connected to a smaller one by 8 traces.