What if I did something like this??

horizloop:
PORTB.2 = 0
PORTB.3 = 1
PAUSEUS 139
ENABLE
ON INTERRUPT GOTO H2lock
DISABLE
PAUSEUS 15
ADCIN 0, adval ' A/D 8 bit value from PORTA.0 into adval
SEROUT2 PORTC.6,16416,[BIN8 adval,13,10] ' Output 8 bit word serially to PC from C.6
PAUSEUS 87
horizpulse = horizpulse + 1
IF horizpulse < 784 THEN
GOTO horizloop
ELSE
PAUSEUS 270
GOTO vertloop
ENDIF

H2lock:
PORTB.3 = 0
PORTB.2 = 1
RESUME