I have a complete reference booklet with all instructions, commands, all S5 memory locations, MC5 instructions 20 bit addressing all plc ranges the lot,
It also has how the block headers are built (in case you want to create blocks on the fly),it's great but lost front cover so don't know wtat the book is called or it's order No.
It even gives you the difference between disk formats like pg675/685 & pc