Did you guys see this original article? It specifies some details about power supply.
https://books.google.com/books?id=Dwvc24nC0IQC&pg=PA171&lpg=PA171&dq=chipmunk+drive+for+tandy&source=bl&ots=zxLx5Gwujj&sig=ACfU3U2vaRAQxsmLG-uT3Zc3iiVMy0eW5w&hl=en&sa=X&ved=2ahUKEwijq5Hl_qX2AhUym-AKHVHHCvQQ6AF6BAgMEAI#v=onepage&q=chipmunk%20drive%20for%20tandy&f=false Sent from my iPhone
