Pugh-Roberts maintained a DYNAMO for the PC. Now PA Consulting has it. I obtained a PC version 5 or 6 years ago from PA.
I suggest poking around their website. If you need to convert DYANMO to Studio, Stella/iThink, or Vensim try and find a copy of the “DYNAMO User’s Manual” by Pugh. I used www.alibris.com and my local university library has a copy too. I have done several conversions from DYNAMO and the book is invaluable in understanding DYNAMO code.