What is the voltage of external power for series 128 walnut?

I have a Series 128 Walnut Monome I’m pulling back out to use. Curious what the proper power supply should be?

(same as shown in http://llllllll.co/t/sold-fs-eu-series-walnut-monome-128/1522)

9-12v 1A center positive 2.1mm


I have an oldskool Walnut 128 Monome without the power supply. Does anybody know what the specs for those power supplies were. What else could I use.

Thank you!