GS1restoration

GS1 Restoration Page!

This is a page for keeping track of the project of restoring the CCRMA Yamaha GS1 prototype.

Will keep track of info here as the project progresses.

First, the initial state of things: The console unit connects to the GS1 to do the initial programming of the 16 presets on the unit. The console is one of the coolest looking pieces of electronics I've ever seen. There are four monochrome green screens on the console. When I first turned it on two of them had no horizontal sync. This was very easy to fix by opening up the unit and adjusting the pots. Note that this still happens sometimes when you first turn it on but it clears up after things warm up a bit.

The console connects to the keyboard with a ribbon cable. There are three connectors on the console where the cable can plug in. I was concerned about getting this wrong so I opened up the unit to see which was which. Turns out the two that are right next to each other aren't connected to anything at all. So, it's the one by itself, you can't mess it up.

The cable has a broken connector on one end. One must be extremely careful when unplugging and replugging the unit. Note that one of the lines on this connector was shorted to the housing when I first unpacked it. I haven't found where this connects yet, but that part, whatever it is, is worthy of come scruitiny.

The connector is a centronics type 24 pin, like a 24 pin version of the 36pin printer connector. I saw it in digikey and it's NOT called centronics. We should order a set to make a nicer cable that is longer and possibly shielded.

Now, about the unit itself...