im trying to understand the lingo in the hack so i can decifer how to get my $0D bin to stay in open loop idle. here is some of the hack ;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ; MPH and TPS within limits to be idling, check quals for open loop idle ;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ; BSET L0050,#$80 ;Status word, set b7, idling LDAA L0295 ;Open loop idle AFR CMPA L026D ;Compare to stored AFR BHI L8AFC ;Bra if AFR < open loop idle AFR, disable ;open loop idle ; ;-AFR is less then lean idle AFR limit here, enter open loop idle ; LDAB L0006 ;Cool temp, linearized CMPB L48D8 ;Threshold to remain in open loop idle BLS L8AE9 ;Bra if less, remain in open loop idle ; LDAB L48D4 ;Timer threshold to enable open loop idle BEQ L8AC9 ;Bra if ==0, check INT thresholds ; LDX #L400B ;Opt. byte BRSET 0,X,#$02,L8AB0 ;Bra if b1==1, AIR enabled ; ;-No open loop idle in P/N if AIR not optioned ; BRSET L0041,#$20,L8AFC ;Status word, bra if b5==1,in park/neutral ; ;-Here if AIR is enabled or in drive ; L8AB0 BRCLR L0050,#$02,L8AC1 ;Status word, bra if not in open loop idle ; ;~~~~~~~~~~~~~~~~~~~ ; In open loop idle ;~~~~~~~~~~~~~~~~~~~ ; LDAB L0294 ;Idle timer CMPB L48D5 ;Timer threshold to transition to open loop idle AFR BLS L8AD9 ;Bra if timer <=, increment timer and cont. ; ;-Here to use open loop idle AFR ; LDAA L0295 ;Load open loop idle AFR BRA L8B05 ;Bra to continue ; ;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ; Not in open loop idle, check quals to enter ;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ; L8AC1 LDAB L48D4 ;Timer threshold to enable open loop idle CMPB L0294 ;Idle timer BCC L8AD9 ;Bra if timer is <=, dont allow open loop idle yet ; ;-Check INT thresholds for open loop idle ; L8AC9 LDAB #128 ;Neutral INT value LDAA L0232 ;INT CMPA #128 ;Compare to neutral value BCC L8AD3 ;Bra if adding fuel ; ;-Fueling is leaning out ; NEGA ;Negate INT ; L8AD3 ABA ;Sub out neutral INT to get diff. from neutral val. CMPA L48EE ;Delta INT threshold to bar open loop idle BLS L8AE4 ;Bra if delta INT is less ; ;-INT threshold not yet met for open loop idle and AIR ; L8AD9 LDAB L0002 ;Loop counter CMPB #$27 ;Counter val to update timer BNE L8B02 ;Bra if != ; INC L0294 ;+1, idle timer BRA L8B02 ;Bra to continue ; ;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ; Here to enable open loop idle ;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ; L8AE4 BSET L0050,#$02 ;Status word, set b1, open loop idle BRA L8AFF ;Bra to continue ; ;-Alternate entry point if not resetting idle timer ; L8AE9 BSET L0050,#$02 ;Status word, set b1, open loop idle BRA L8B05 ;Bra to continue ; ;~~~~~~~~~~~~~~~~~~~~ ; Here if not idling ;~~~~~~~~~~~~~~~~~~~~ ; L8AEE LDD L00F8 ;Engine run time CPD L48D6 ;Engine run time to clear initial idle terms BCS L8AF9 ;Bra if timer is < ; BSET L003F,#$40 ;Status word, set b6, clear initial added IAC flow ; L8AF9 BCLR L0050,#$80 ;Status word, clear b7, idle flag ; ;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ;-Here to disable open loop idle ;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ; L8AFC BCLR L0050,#$02 ;Clear open loop idle flag ; L8AFF CLR L0294 ;Clear idle timer ; L8B02 LDAA L026D ;Stored AFR L8B05 BRSET L003E,#$80,L8B3F ;Status word, bra if b7==1, in closed loop ; ;~~~~~~~~~~~~~~~~~~~ ; In open loop here ;~~~~~~~~~~~~~~~~~~~ ; BRCLR L0004,#$10,L8B13 ;Status word, bra if b4==0, no hot restart ; ;-Hot restart in effect ; SUBA L4952 ;Subtract AFR bias for hot restart BCC L8B13 ;Bra if no underflow ; CLRA ;Clear underflow ; ;-Hot restart not in effect, check temp limits for open loop AFR enrichment so what does "bra if" statements mean? also when i see the word threshhold. does the value need to be higher to enable? ;~~~~~~~~~~~~~~~~~~~~~~ ;-Open loop idle quals ;~~~~~~~~~~~~~~~~~~~~~~ ; L48D4 FCB 255 ;255 sec, timer threshold to enable open loop idle L48D5 FCB 0 ;Timer threshold to remain in open loop idle L48D6 FDB 0015 ;15 sec, time after startup to clear initial idle terms L48D8 FCB 100 ;35 dec C, threshold to remain in open loop idle ; ;~~~~~~~~~~~~~~~~~~~~~~ ;-Open loop AFR params ;~~~~~~~~~~~~~~~~~~~~~~ ; L48D9 FCB 173 ;90 deg C, temp threshold for open loop idle AFR bias L48DA FCB 0 ;-40 deg C, lower cool temp for open loop AFR enrichment L48DB FCB 254 ;151 dec C, upper cool temp for open loop AFR enrichment ; L48DC FCB 200 ;10 secs, time limit for initial AFR enrichment ; L48DD FCB 147 ;14.7:1, stoich AFR ; L48DE FCB 16 ;1.6:1 AFR bias for open loop idle ; Used prior to TPS action after start up ; L48DF FCB 147 ;14.7:1 AFR, lower limit for quasi-closed loop L48E0 FCB 10 ;1.0:1, onitiial AFR enrichemnt L48E1 FCB 5 ;0.5:1, initial AFR enrichment if in park/neutral L48E2 FCB 6 ;Filter coeff. for filtering AFR after transition from idle ;

BR "Branch" statements work like this for example:

BRSET L0041,#$20,L8AFC ;Status word, bra if b5==1,in park/neutral

BRSET if the statement is true, then BRanch to location L8AFC
The statement is: is the bit at location L0041 bit 5 turned on?

L0041 is the address, # states its a number not a value, $20 is hex for bit 5.
Syntax does change in some cases between assemblers/disassemblers so you'll need to be careful determining if something is a value or an address.

The text after all this is from the author telling you that "branch if L0041, bit 5 is ON" (Park or Neutral position will make that true)


Thresholds are just values that must be crossed to make something true/false. Can be high or low depending on what you are doing.
HTH