D'oh- I thought the PPS-4/1 opcodes would be the same as the other PPS-4 chips. It looks like we need the PPS-4/1 Programmng Manual #29410N38 and/or the PPS-4/1 Operator's Manual for Universal Assemulator #29400N37 ([homer]MMMM assemulator[/homer]).
A quick patent search came up with source and object code for a telephone that uses the MM77: 4203011. Maybe the opcodes are the same as for the MM78, or maybe there's a patent with MM78 code.
