ALDL protocol for ABS Delco VI

Hi all:

I'm looking for any info on the protocol used by the Tech 1 (pre- OBD II) scanner to read the codes from the GM Delco VI ABS system. I don't need the serial port (hardware) stuff - and I have the codes. I just need the protocol (how it talks to the ABS system) Any help would be appreciated. TIA

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