The CRT B1 card has the RAM used for storage of displaying data. It also containg the PROMs used for character generation. Board has no jumpers, but has several LEDs.

 



 

 Board Position               Description

 

 DS1                  ? Occasionally lit when character mode changes. DS2                  ? Lit while in small character  mode. DS3                  ? Lit while in normal character mode. DS4                  ? Lit while in Honeywell  character mode. DS5                  ? Normally off.  When lit  indicates a ROM failure. DS6,7,8              ? Periodically lit to indicate firmware operation state. When station in reset and lit it indicates RAM failure.