Ah, sad and bad news... Transferred ICP.TSK as usual and checked it with DMP (between simh and the MicroPDP). Gave it a try, but got a system crash. I suspect that the Indirect Command Processor is tightly linked with the kernel...
Another curious thing is this... Dumping the first block with DMP or a Linux/DOS tools gives different results. For example: DMP === B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B12 B13 B14 B15 B16 Linux/DOS ========= B16 B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 Byte sequence is reversed. It isn't a Big/Little Endian issue. The entire 16 bytes string is reversed. I could figure out what files are needed to reassemble it with MAC, but I think I'd need the 4.2 distribution...