Asl Gap
FWIW, I used both the official Avalon Hill GAP and the Steve Zundel GAP.
The Avalon Hill GAP was much quicker to use. Type '8' (for firepower), type '2' (for TEM), hit ENTER. It tells you NMC, reminds you of weapon malfunction, ROF and SAN, etc.
Then you go to the 'Enter a Number'...