                     Operating Instructions for the Charles work-stations
                     ====================================================

                  A Charles work-station consists of a PDP 11/23 processor, a colour monitor,
                  a Visual 200 terminal, and a Bit Pad.  Each workstation has an 8 plane
                  framestore (giving 255 colours) although if they are being used from VAX
                  only 16 of the colours are available because of a restriction in the
                  protocol used to drive them.  The workstations are called Charles II and
                  Charles III for historical reasons.

                     The speed of the terminal (19.2Kb) on each station is hard-wired into
                  the PDP 11, so the terminal speeds cannot be changed !

                     Normally each station is switched off at the power distribution point
                  mounted on the wall, and all that is required to power the equipment up
                  is to switch it on at the appropriate switch.  If this fails, the
                  following list gives the things to check for each station.

               Normal procedure :

                           Switch on the power distribution point.

               If this fails :

                  Charles II :
                           Check that all the switches are UP.

                  Charles III :
                           Check that the "DC ON" and "ENABLE HALT" buttons on the PDP11
                           are UP, and that the "LTC" switch is DOWN.

                     Check that the display is on, (button lower left of screen on II,
                                                    and lower right of screen on III).

                     Check that the terminal is switched on,
                           (the switch is on the right hand side of the screen).

                     The terminal will be connected to VAX so the work-station may now be
                     used to talk to the VAX/VMS service as though it were an normal terminal.

                     Before any pictures are drawn on the Charles display it is necessary
                     to load Charles with a protocol interpreter.  This is done using the
                     VAX command  CHARLES  (assuming that the command SETUP VLSI has already
                     been given in your LOGIN.COM file).

               If the terminal hangs, the following action can be used to reset it -

                  Charles II :    Press the button marked RESET.

                  Charles III :   Press the DC ON switch down and then up to reset.

                     When the command CHARLES has been given there are a few minutes where
                     it is not possible to type ahead.  After the CHARLES command has
                     terminated the terminal can once again be used as a normal terminal
                     for interacting with the host.