How do you reset the computer in the 92 roadmaster?

To reset the computer in a 1992 Buick Roadmaster, you can disconnect the negative battery cable for about 15 minutes. This will clear any stored diagnostic trouble codes and reset the engine control module (ECM). After reconnecting the battery, you may need to drive the vehicle for a short distance to allow the ECM to re-learn its parameters. Always ensure you have any necessary radio codes or settings noted before disconnecting the battery.