         GBLA SCL_IN
SCL_IN   SETA 64              ; Ack bit
         GBLA SCL_LOW
SCL_LOW  SETA 2               ; (AutoFeed bit)
         GBLA SCL_HIGH
SCL_HIGH SETA 0
         GBLA SDA_IN
SDA_IN   SETA 128             ; Busy bit
         GBLA SDA_LOW
SDA_LOW  SETA 1               ; (Strobe bit)
         GBLA SDA_HIGH
SDA_HIGH SETA 0

