
board revision 28 hardware:

Lamp sensors
P3.7 TB6 I Lamp 0 trigger in from controller
P3.6 TB5 I Lamp 3
P3.5 TB4 I Lamp 2
P3.4 TB3 I Lamp 1 Osc
P2.3 TB2 I Lamp 4

P2.1 TB0 O Output 0
P2.2 TB1 O To delay chip Output 1
P2.6 port O Crowbar driver

Delay line on driver 1
P3.3 O  D
P3.2 O  Clock
P3.1 I  Q
P3.0 O  LE

Accopian:
P6.6 A6 AI Voltage monitor
P6.7 A7 AI Current monitor

P5.7 O SCL
P5.6 O SDA
P5.5 O Inhibit  (high==high voltage off)

P4.0 uart O Rs-232 Out
P4.1 uart I Rs-232 In
P2.4 uart O RS-232 Out
P2.5 uart I RS-232 In

Heaters:

P1.0 TA0 O Heat0
P1.1 port O 5V regulator enable for thermistor chips (to reset)
P1.2 TA1 O Heat1
P1.3 port O CS0
P1.4 port O CS1
P1.5 port O CS2
P1.6 port O Clock
P1.7 port I SO
P2.0 TA2 O Heat2

Relay drivers:
P5.0 O relay 0
P5.1 O relay 1	AC enable for 24V supply

P6.4 AI 12V rail monitor (through resistor divider)
P6.5 AI 24V rail monitor (through resistor divider)


Spare:
Port 1 is available on P3
extra RS-232 on P9
P4.2 to P4.7 on P16

P2.7 No connect
