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Apple IIc
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===Original IIc (ROM version '255')=== The initial ROM, installed in machines produced during the first year and a half of production, is 16 KB in size. The only device which can be connected to the disk port is (one) external 5.25-inch floppy drive; software can be booted from this external drive by typing the command {{code|PR#7}}. The serial port does not mask incoming linefeed characters or support the [[software flow control|XON/XOFF]] protocol, unlike all later firmware revisions. There is no self-test diagnostic present in this ROM; holding down the {{keypress|solid-Apple}} key during cold boot merely cycles unusual patterns on screen which serves no useful purpose or indication of the machine's health.
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