GM ECU 1227730 was used on several General Motors cars in the late 1980s and early 1990s, including the Chevrolet Corvette and Camaro. The chip used in this ECU is known as "memcal".
The specific memcal used in your ECU may vary depending on the specific application and modifications made to your car. Without more information, it is difficult to determine the exact catalog number of the memcal that is currently installed.
There are several aftermarket companies that make replacement memcals for the GM 1227730 ECU. These replacement memocals can offer improved performance and control over standard programming. Companies making replacement memos for GM 1227730:
Tuned Port Injection Specialties (TPIS)
Racetronix
Wester's Garage
Street & Performance
Moates.net.
To find the right chip for you, you'll need to consult with representatives from these companies. Good luck.