* *keypad* is an XBus input connected to a keypad.
* *extrude* is a simple output connected to a meat extruder.
* *valve-0* through *valve-2* are simple outputs connected to valves in the meat extruder that control whether LEAN MIX (low) or FAT MIX (high) is extruded.
* When a value is available from the *keypad*, read it and assemble the corresponding MEAT SPECIFICATION, which are found on a page in the “Supplemental Data” section of the manual:

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| 1 | cutlet-style meat
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| 2 | steak-style meat
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| 3 | bacon-style meat