The Pennywhistle was an early acoustic coupler modem originally designed and built by Lee Felsenstein in 1973, and later commercialized and offered for...

Novation CAT and the Anderson-Jacobson. A lower-cost option was the Pennywhistle modem, designed to be built using readily available parts. Teletype machines...

terminals available to the hobbyist. The March 1976 issue had the "Pennywhistle Modem" and the July 1976 issue had the "SOL Intelligent Terminal". The SOL...

the Intel 8080 based Sol-20 computer from Processor Technology, the PennyWhistle modem, and other early "S-100 bus" era designs. His shared-memory alphanumeric...

original modem connecting the terminals to the mainframe prompted Community Memory hardware person, Lee Felsenstein, to invent the Pennywhistle modem, whose...

the cost. One of his earliest designs in the computer field was the Pennywhistle modem, a 300 bits per second acoustic coupler that was ⁠1/3⁠ the cost of...

for the Community Memory bulletin board system. He had designed the Pennywhistle modem to address the need for remote access at a price under $100, but the...