The cost of running the system was untenable; the teletype normally cost $1,500 (their first example was donated from Tymeshare as junk), the modem another $300, and time on the SDS was expensive – in 1968 Tymshare charged $13 per hour (). Even the reams of paper output from the terminal were too expensive to be practical and the system jammed all the time. The replacement of the Model 33 with a Hazeltine glass terminal helped, but it required constant repairs. Since 1973, Felsenstein had been looking for ways to lower the cost. One of his earliest designs in the computer field was the Pennywhistle modem, a 300 bits per second acoustic coupler that was the cost of commercial models. When he saw Don Lancaster's TV Typewriter on the cover of the September 1973 "Popular Electronics", he began adapting its circuitry as the basis for a design he called the Tom Swift Terminal. The terminal was deliberately designed to allow it to be easily repaired. Combined with the Pennywhistle, users would have a cost-effective way to access Community Memory. In January 1975, Felsenstein saw a post on Community Memory by Bob Marsh asking if anyone would like to share a garage. Marsh was designing a fancy wood-cased digital clock and needed space to work on it. Felsenstein had previously met Marsh at school and agreed to split the $175 rent on a garage in Berkeley. Shortly after, Community Memory shut down for the last time, having burned out the relationship with its primary funding source, Project One, as well the energy of its founding members. January 1975 was also the month that the Altair 8800 appeared on the front page of "Popular Electronics", sparking off intense interest among the engineers of the rapidly growing Silicon Valley. Shortly thereafter, on 5 March 1975, Gordon French and Fred Moore held the first meeting of what would become the Homebrew Computer Club. Felsenstein took Marsh to one of the meetings, Marsh saw an opportunity supplying add-on cards for the Altair, and in April, he formed Processor Technology with his friend Gary Ingram. The new company's first product was a 4 kB DRAM memory card for the Altair. A similar card was already available from the Altair's designers, MITS, but it was almost impossible to get working properly. Marsh began offering Felsenstein contracts to draw schematics or write manuals for the products they planned to introduce. Felsenstein was still working on the terminal as well, and in July, Marsh offered to pay him to develop the video portion.