I toggled Daisy into a Imsai 8080, probably from Dr. Dobbs. I then wrote a music "compiler" in BASIC for my SWTPC 6800. You could enter three octives of notes and it would generate a data table for the song. I drove the output buffers on the parallel port. You just had to put your radio near the computer. These systems made so much radio interferance the FCC had to come out with standards. I remember an FCC report the mentioned the SWTPC 6800 as one of the offenders. (The Apple II switching power supply was a radio transmitter that also put out 5 volts.) In the early 1990s I used a Xilinx FPGA demo board and made a Music circuit chip that blinked the LEDs at 1 Mhz. The one chip, battery operated board would transmit for several feet. Being a RAM based FPGA, you could download song after song. (I converted my music compiler from BASIC to C.) ----------------------------------------------- Michael Holley http://www.swtpc.com/mholley/index.html ----------------------------------------------- ----- Original Message ----- From: "Douglas Quebbeman" <dhquebbeman(a)theestopinalgroup.com> To: <classiccmp(a)classiccmp.org> Sent: Tuesday, November 27, 2001 7:44 AM Subject: RE: AM radio music