The ones beginning with "A" indicate that the TSBK being sent is the last block. The opcode is actually only the last six bits of the first hex pair, not all eight. The first bit indicates whether this is the "last block" or not - as told to me by Rick Parrish (Unitrunker), some systems send TSBKs in blocks of 3 or so - and the 2nd bit indicates whether the opcode is in Protected (encrypted) mode or not.
Get the binary representation of the two-digit hex value and take only the rightmost six bits. Or, check to see if the decimal value of the two-digit hex value is >127, and if it is, subtract dec 128.