PDP-1 binary formats

[larsbrinkhoff]

PDP-1 "read-in" format. Binary words on the tape can be either

• DIO addr, then data, or
• JMP addr or HLT.

Block format.

• DIO addr, DIO count, data, one's complement checksum.
• Or JMP.

CC @aap

[larsbrinkhoff]

CC @Sgeo; would you have any use for reading, writing, converting, or merging PDP-1 binary files?

[Sgeo]

The main thing I would like is a disassembler that easily understands a RIM tape. Reading in a tape into SIMH then stopping it quickly and disassembling the dumped memory is probably not the best approach. I could convert RIM format to a memory dump easily. I assume that block format is a popular second stage after RIM format?

Also, I note that several emulators treat DAC as a valid RIM instruction even though the handbook ignores it, with one emulator having a comment about a Lisp tape wrongly using it.