; =============================================================================
;  The PAL ...... (SG F22HA9231)
; 
; The latch address at $4000 is the Output latch.
; The latch address at $6000 is the Input latch.
;
;
pal_4000_latch  equ     $4000   ; Output Latch
;                               ; 1xxxxxxx -
;                               ; x1xxxxxx - PAL-44  zero AN0 input 
;                               ; xx1xxxxx - PAL-43  Fuel Pump Relay  J1-28
;                               ; xxx1xxxx - PAL-42  NC
;                               ; xxxx1xxx - PAL-41  Aux Relay Drvr   J1-12
;                               ; xxxxx1xx - PAL-40  AN0 switch to thermister
;                               ; xxxxxx1x - PAL-39  AN0 switch to HY2-7
;                               ; xxxxxxx1 - PAL-38  ANO switch to HY3-2
;
; The seven section inverter (L9112D) is a strange part.  All of its inputs
;  seem to have a 4.7k resistor to ground, so with nothing pulling it up
;  that sections output will be high.  One section (pins 3,4) is used to drive
;  INJ-D from the 68HC11's internal timer, and another section is the serial
;  interface reciever.  All the others, with the exception of the one that seems
;  to be monitoring the IAC motor driver transistor collector (pins 1,2), have
;  some connection to the outside world thru J1.  Some are pulled up and some
;  pulled down either internally and/or externally.  The below displayed bits
;  are the default conditions observed.
;
; The only bit that is tested in this code is 00000100.  It is tested several
;  places.  Nothing is connected to J1-21 so it is always high.
;
; 08/29/99 - Found what J1-21 purpose is.  It is an input that is connected to
;            the AC to detect if it is on.  If the ECU senses that an AC is on
;            there is another 6.6% added to the IAC motor duty cycle to keep the
;            the RPM up.
;
pal_6000_latch  equ     $6000   ; Input latch
                                ; The PAL loacation reads information from
                                ;  the L9112D inverter
                                ; 1xxxxxxx - 
                                ; x1xxxxxx -
                                ; xx1xxxxx -
                                ; xxx1xxxx - PAL-5  L9112-6  - J1-16 - N/C
                                ; xxxx1xxx - PAL-4  L9112-2  - J1-34 - IAC
                                ; xxxxx1xx - PAL-3  L9112-12 - J1-21 - AC Sense
                                ; xxxxxx1x - PAL-2  L9112-7  - J1-13 - N/C
                                ; xxxxxxx1 - PAL-1  L9912-15 - J1-14 - N/C
                                ;
;==============================================================================