Sat May 15 17:52:49 EDT 2010
Broken PAIA Fatman
I have two Fatman kits, one built but broken (probably uC died trough
short-circuit) and one not assembled. Plan: order a desktop case for
the packaged kit + try to get the built one working with a PIC
DAC = floating point: note select uC P36 and P34-P35 for octave
Trying 13.5 MHz xtal with 4550. This won't work with fixed frequency
96 MHZ PLL, which needs a 4MHz input. FIXED: using 8MHz XTAL.
4550 OK @ 230400 baud.
Next: Fatman power supply. Done. 12V AC connected, and the
oscillators seem to work.
Both A(S)R for VCF and ADSR for VCA are on when inputs = 0V, which is
the reason it sounds when the pins are not driven; they go to NPN
- serial comm
- analog in
- 1 interrupt for serial
- 3 OUT
- 2 IN (envelope interrupt)
- 12 OUT: 8 (NOTE) + 2 (OCTAVE) + 2 (S/H)
- 74HC373 can be patched through (use SH for setting CVs)
- RB7,6,5 as inputs for 2x envelope in and 1x midi in.
MIDI @ 38400 baud / 12MIPS is DIV=312.5
- RA0,1,6 as outputs for envelopes.
next: A(S)R input : O15 (P31) -> RA4 (P6)
works, after fixing the +8 volt connection