ECM ID

[Don.F.Broadus at ucm.com]

On my weekly GM ECM round up at the local junk yard I came across these
ECM's for a price I couldn't refuse.
Any info would be appreciated 1227301    1228330    1226519  
Do any of the TBI applications use the older ECM with the card edge
connector ? 
When did GM stop using the card edge connector and switch to the socket
connector as on the '747' ECM  ?
Thanks for the help, this is a great list!!!!
 
Don