William Levak wrote: > > On Mon, 11 Oct 1999, Larry Anderson wrote: > > > **also in related news I picked up a 'petunia' board for the PET and an > > article on computer music by hal chamberlin, The petunia board has a working > > composite video circuit for the PET (will have to check it against Nick > > Hampshire's and MICRO's to see which one is employed, if those.) and the > > Chamberlin article essentially shows how to make the four-voice music circuit > > used in the MTU and the Petunia music boards. > > I also have a Petunia board, but the sound section has no components. > Could you tell me what the chips are at positions 3 and 4 and resistors 9 > thru 24? I have used this with the original PET's without the CRTC chip. > You can feed the output to a monitor or use a RF modulator to feed it to a > TV. With the later PET's with the CRTC it is necessary to change the CRTC > parameters to be compatible with the TV. You also have to change a > capacitor on the Petunia to compensate for the higher scan rate. I don't > have that information handy now. I will have to dig it out. > Ok finally scanned the circuit into a GIF, here it is at: http://www.jps.net/foxnhare/chamberlin.gif It should be no problem to figure out what goes where... BTW... Anyone have any software for the Hal Chamberlin, MTU, Petunia music board??? I have the example in the article but I am hoping to locate an editor... -- 01000011 01001111 01001101 01001101 01001111 01000100 01001111 01010010 01000101 Larry Anderson - Sysop of Silicon Realms BBS (209) 754-1363 300-2400 baud Commodore 8-bit page at: http://www.jps.net/foxnhare/commodore.html 01000011 01001111 01001101 01010000 01010101 01010100 01000101 01010010 01010011 - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
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