Editing IBM 1620 (section)

===IBM 1622 Card reader/punch===
The '''[[IBM 1622|IBM 1622 Card reader/punch]]''' could:

* read a maximum of 250 cards per minute
* punch a maximum of 125 cards/minute.<ref name=IBM.intro59/>

The 1622's controls were divided into three groups: 3 punch control rocker switches, 6 buttons, and 2 reader control rocker switches.

Punch Rocker switches:
* Punch Off/Punch On – This rocker turned the punch mechanism off or on.
* Select No-Stop/Select Stop – This rocker selected if mispunched cards (deposited in the punch error select stacker instead of the normal punch stacker) let the punch continue or caused a check stop.
* Non-Process Runout – This rocker with the punch hopper empty, "ranout" remaining cards from the punch mechanism.

Buttons:
* Start punch – Pressing this key with the punch idle and on, started the punch. The computer could now punch cards.
* Stop punch – Pressing this key with the punch active, stopped the punch.
* Check Reset – Pressing this key reset all "error check" conditions in the reader and punch.
* Load – Pressing this key with the reader idle and on and the computer in ''Manual'' mode started the reader, reset the program counter (in the MARS core memory) to zero, read one card into the reader's buffer and checked the card for errors, and simulated the execution of a Read Numeric from Card Reader to address zero (reading the 80 characters of the reader's buffer into memory addresses 00000 to 00079), then switched the computer into ''Automatic'' mode (starting execution at the address in the program counter).
* Stop reader – Pressing this key with the reader active, stopped the reader.
* Start reader – Pressing this key with the reader idle and on, started the reader and read one card into the reader's buffer and checked the card for errors. The computer could now read cards.

Reader Rocker switches:
* Non-Process Runout – This rocker with the read hopper empty, "ranout" remaining cards from the reader mechanism.
* Reader Off/Reader On – This rocker turned the reader mechanism off or on.
{| class="wikitable"
|-
!Bootstrap procedure
!Notes
|-
|Press ''Load''
|
|}