This is a special mode activated by the "Read-In" Switch on the Console.
It provides a means of entering programs which neither rely on read-in
programs in memory nor require a plug board. Pushing the "Read-In"
Switch starts the reader in the binary mode. The first group of six
lines and alternate succeeding groups of six lines are interpreted as
"Read-In" mode instructions. Even-numbered groups of 6 lines are data.
The "Read-In" mode instructions must be either "deposit in-out" (dio Y)
or "jump" (jmp Y). If the instruction is dio Y, the next group of six
binary lines will be stored in memory location Y and the reader
continues moving. If the instruction is jmp Y, the "Read-In" mode is
terminated and the computer will commence operation at the address of
the jump instruction.