Circuit Cellar HCS II
                                  Version 1.20
                               November 20, 1992


     Updating Your System
     ---------------------
     You must have a blank 27C256 EPROM and the proper hardware to program
     the device to complete this update.  If you can't make an EPROM, con-
     tact Circuit Cellar to find out how to obtain a preprogrammed EPROM.

     The HCSROM.HEX file contains an Intel hex image of the version 1.20
     Supervisory Controller EPROM.  Virtually all EPROM programmers support
     Intel hex format.  Simply send the file to your programmer, burn an
     EPROM, and replace the EPROM in socket U9 with the new one.

     Both COMPILE and HOST *must* be replaced by the version 1.20 files in-
     cluded here.  There are subtle enough changes to the way both work
     that version 1.00 or 1.01 code cannot be used.  Be sure to recompile
     your XPRESS program with the new COMPILE before sending your program
     to the SC.


     Changes and Fixes
     -----------------
     Version 1.20
     11/20/92       Fix:    If an XPRESS program contained any GIF state-
                             ments, a power outage or system reset required
                             the program to be reloaded. All XPRESS pro-
                             grams now resume normal operation after a
                             power outage or reset.
                    Fix:    Tab characters were ignored rather than being
                             treated as separators.  Tabs may now be used
                             for spacing within XPRESS programs.
                    Fix:    On fast IBM PC compatibles, HOST would time out
                             during a time or program load even though the
                             SC was working correctly.  The timeout has
                             been extended to work with machines of all
                             speeds.
                    New:    The MCIR-Link is now supported.  See below for
                             new XPRESS command.
                    New:    Whole strings may be sent to DIO-Link modules.
                             When a parallel printer is connected to the
                             DIO-Link in byte mode, the printer may be used
                             for logging or messages.  See below for new
                             XPRESS command.

     Version 1.01
     4/27/92	    Fix:    When the SC was reset, the on-board ADC stopped
                             working.  The ADC now continues to work
                             normally after a power outage or reset.
                    Fix:    AllLightsOn/AllUnitsOff didn't work.
                    Fix:    BUFIO input ports didn't work.
                    Change: Page 41 of the XPRESS manual should list the
                             port addresses for the BUFIO board as A000,
                             A001, A002, A010, A011, and A012.
                    Change: Section 5.4.2 of the XPRESS manual doesn't in-
                             clude a detailed description of the INC state-
                             ment.  The statement is listed in the keyword
                             tables on page 21.  Syntax is identical to the
                             DEC statement.

     Version 1.00
     3/17/92        Release version.


     ======================================================================
     MCIR           Tell an MCIR-Link to send a trained infrared command

                    The MCIR-Link stores trained IR commands and references
                    them by number.  You must set up (train) the MCIR-Link
                    in interactive mode before connecting it to the
                    network.  XPRESS only allows you to instruct the MCIR-
                    Link to send a command that has already been stored.
                    It does not allow remote training or loading of the
                    MCIR-Link module.  See the MCIR-Link manual for more
                    details.

                    Syntax:      MCIR(n) = c
                    where:       n = MCIR-Link number (0-7)
                                 c = MCIR code to send (1-999, 1001-1999)

                    COMM-Links:  MCIR

                    Example:     DEFINE TVon = 6     ! Trained MCIR code

                                 IF Input(8)=ON THEN
                                   LCD(0) = "Turning on TV"
                                   MCIR(0) = TVon
                                 END

     ======================================================================
     LPT            Send a message to a DIO-Link

                    Any ASCII text string may be sent to any DIO-Link on
                    the network that has a byte-wide device connected to it
                    (such as a printer).  The subset of ANSI control se-
                    quences supported by the DIO-Link may be used to format
                    the output.  See the DIO-Link documentation for more
                    information about device connection and supported ANSI
                    commands.

                    Syntax:      LPT(n) = "string"

                    where:       n = DIO-Link number (0-7)
                                 string = ASCII text string; must be
                                           surrounded by quotes

                    COMM-Links:  DIO

                    Example:     IF Input(8)=ON THEN
                                   LPT(1) = "Motion sensed\n"
                                 END