Yeah, I knew Kansas City was FSK. I was just fondly remembering the good old days. You should be able to find an old modem chip that will do the job (if you can actually source the chip). Alternatively, you might be able to generate the QPSK with a PIC's PWM output , but reading it back might be rather challenging. What bit rate do you hope to achieve? Bob Ammerman RAm Systems (contract development of high performance, high function, low-level software) ----- Original Message ----- From: Antonio L Benci To: Sent: Thursday, February 22, 2001 7:54 PM Subject: Re: [PIC]: Data Recording to Cassette Tape using QPSK. > Kansas City is FSK. I'm actually after high data density. > > QPSK is/was used for modem data transmission over PSTN so the bandwidth > is no problem for a cassette tape. > > Bob Ammerman wrote: > > > > Yikes, > > > > I haven't seen a cassette tape interface since my Altair S100 bus days! > > > > There were actually standards for this, try "Kansas City Standard". > > > > Bob Ammerman > > RAm Systems > > (contract development of high performance, high function, low-level > > software) > > > > Nino. > -- > ------------------------------------------------------ > | Antonio (Nino) L. Benci | > | Professional Officer, Electronic Services | > | School of Physics & Materials Engineering | > | Monash University | > | email: nino.benci@spme.monash.edu | > | T: 61 3 9905 3649. F: 61 3 9905 3637 | > | M: 0414 924 833 | > ------------------------------------------------------ > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics