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 cbm-hackers-request@dot.tcm.hut.fi.
Archive generated by hypermail 2.1.1.