Pascal: Interface cards in peripheral slot #3

The Pascal system will not appear to boot correctly on the standard Apple
video if slot #3 has a Communications card, Serial card, or DC Hayes
Micromodem card in it. Pascal reserves slot #3 for an external terminal, so
when Pascal recognizes a card in this slot, it attempts to communicate with the
assumed terminal and not with the default CONSOLE and SYSTERM (video and
keyboard). Other cards may also cause this effect, which can be easily
remedied by removing the card from slot #3.
Published Date: Feb 18, 2012