All user reviews for the Yamaha PSR-90

Manual: http://www2.yamaha.co.jp/manual/pdf/emi/english/port/PSR90E.pdf

- What type of keyboard (synth, piano...)? How many octaves?
This is a 5 octave electronic keyboard, not a synth nor a piano. Not even close.
The touch is like most synths: ok, but no dynamic touch or after touch here. This is an extremely basic machine with crap sounds and it was probably extremely overpriced when it came out around 1982. However, if you stick it through some good effects, i'm sure you can use it quite adequately.

- What connection types are there? (audio, MIDI...)?
RCA stereo out, some sort of effects loops out & in (still stereo RCA) but i've never used that...MIDI in & out...exp pedal and footswith. Power is a separate adaptor.
The keyboard comes with a plastic & metal stand that fits on it and lets you have sheet music to read while you're playing, as seen on the photo here. You can take this off.

- How many different sounds and/or styles available? Can they be edited?
Not a lot. Check the manual but we're talking about 24-36 here.
You can't edit the sounds other than add chorus, reverb, portamento.

The rhythms are the only reason one would want to buy this, along with the fact that this is a very simple drum machine with some fairly decent sounds, surprisingly enough.
The rhythms are cheesy & fun, it's great, you can have a looot of fun with this. Plug it into an expander (i used my Roland GR-30 MIDI guitar expander with no probs) and you can actually have a good time, but i'm not sure you can do much with this thing apart from that.

- Is there an effects section?
Nope

- What are the features/characteristics of the sequencer?
4 tracks, you can save to cartridge if you find any on the second hand market (good luck) or to cassette or minidisc. Those of you who have had a Sinclair ZX Spectrum or a Commodore 64 will know what it's like.

UTILIZATION

- Is the general configuration/setup simple?
Oh yeah!

- Is the sound or effects editing easy?
The what?

- Is the manual clear and sufficient?...
Yep.

OVERALL OPINION

- For how long have you been using it?
Probably too long.

- What thing do you like most/least about it?
I looove the rhythms and i often use the drum machine feature of it, cos it's easy & fast to come up with something, and i actually like some of the drum sounds, believe it or not.
That's why i bought it and that's why i still have it...after 8 years or so...

- Did you try many other models before getting this one?
One or two smaller ones...more modern...just as bad/kitsch.

- What is your opinion about the value for the price?
No idea how much this was selling in 1982 but it was way too much for what it is.
I bought it for a crazy £70 in 2000, and looking back i think i was stupid, it's worth £20 max. Unless you can see the unique fun potential in it...in which case it's priceless!

- Knowing what you know now, would you make the same choice?...
Yes, i guess, cos i've made one of my favourite tracks ever with the rhythms on this, and i would never have done that with any other machine.