FIG-FORTH RELEASE 1.1
 
        THIS PUBLICATION HAS BEEN MADE AVAILABLE BY THE
                FORTH INTEREST GROUP
                PO BOX 1105
                SAN CARLOS, CA  94070
 
        IMPLEMENTATION BY JOHN CASSADY
        MODIFIED BY KIM HARRIS
 
        THIS VERSION FOR THE RADIO SHACK MODEL 100 BY:
 
                DAVID O ROWELL
                3961 CHERRY VLY TPK
                MARIETTA, NY 13110
 
        The file FIG4TH.100 is the basic nucleus of a figFORTH
        system.  It will run on a 32k Mod 100 as is.  (NEC ?? It
        should at this point.)  Since the system is only allowed
        (this configuration) to use 16k it probably can be made
        to work on a 24k system too.  The origin is set at A100H
        (41216 decimal) for two reasons: first to give some room
        below it for TEXT or BASIC to work with and secondly to
        conform to the figFORTH listing for CP/M which ORG's at
        100H.  This way I didn't have to make, and debug, a fat
        listing of the figFORTH source.  I've allowed 16K above
        that for figFORTH, LIMIT= E000H (57344), to use and I
        use another 3k+ above that for an in memory storage of 3
        screens.  This gives enough room for DISKMANAGER to be
        resident at all times. (Don't know what I'd do without
        that program!!)
        ++
        OK, to get started download FIG4TH.100 as a TEXT file,
        clean it of any download garbage and verify the checksum
        of 741,760.  SAVE the TEXT file to tape (sorry 'bout
        that!).  Now CLEAR 256,41216 and run CHANGE.BA to load
        the TEXT file into memory as a binary file.  At this
        point you have figFORTH installed in memory and can run
        it.  But first why not SAVE it so you don't need to do
        that again?  Clean out all the junk below 41216 and
        SAVEM"FIG4TH",41216,47753,41216, you'll just have room.
        Now SAVE it to disk or tape as a .CO file.
        I've uploaded this version half finished but useable
        since I don't have the time right now to finish up the
        disk interface.  As it stands the TDD can be used even
        tho' its awkward.  If some kind soul wants to finish it
        I can upload a lot more information to help them, just
        send me a note on EASYPLEX.  As it stands its a very
        nice figFORTH and is highly useful in learning.  There
        is some potiential as a control language even with this
        version.  THERE IS NO BETTER LANGUAGE TO LEARN ABOUT THE
        M100'S GUTS THAN FORTH - the ULTIMATE hacker's
        language.
        This figFORTH has two entry points, 41216 for a COLD












        start and 41219 for a WARM restart.  ->figFORTH IS CASE
        SENSITIVE SO PRESS THE SHIFT LOCK AND LEAVE IT THERE!<-
        Cold start it (CALL 41216) and you will see the initial
        greeting "8085 FIG FORTH 1.1".  Type "-8 OFFSET !" and
        ENTER to set up the in memory "SCREENS" properly.  Type
        "HEX E000 C00 ERASE (ENTER)".  How's that for speed in
        0'ing 3K of memory?  Type "EMPTY-BUFFERS (ENTER)" to
        clean up fig's internal text buffers and you're all set
        to learn FORTH!
        Screens can be stored on disk and brought back and forth
        (heh heh) at will, just remember that in memory screen 1
        is located between 57344 (E000) and 58367 (E3FF), screen
        2 between 58368 (E400) and 59391 (E7FF) and screen 3
        between 59392 (E800) and 60416 (EBFF).  Just SAVEM any
        screens you want to save and push 'em off to disk.  To
        reload 'em put the MENU cursor over the name and press
        return, restart figFORTH and the screen is available.
        You can use CMOVE to transfer directly to and from a
        text file if you are carefull and understand what you're
        up to!
        How do you learn FORTH?  We're very fortunate in having
        a number of excellent books to help.  Without
        qualification I'd recommend "STARTING FORTH" by Leo
        Brodie, Forth Inc., published by Prentice-Hall.  The
        second edition is to be preferred but the first will do
        just fine.  When I get time I'll upload my "Brodie to
        figFORTH translator" which will help with the first
        edition.  Join FIG, the address is up front.  They have
        a great "FORTH HANDY REFERENCE" card for fig.  But buy
        Brodie - you'll never regret it!
        OK, what's different about this implementation of fig?
        I've implemented the in memory R/W from the installation
        manual in low level forth.  Its buried down with the
        rest of the I/O section.  To keep with the memory
        adresses of the source listing I've left a big chunk of
        0's to fill to TICK.  For readability COUT is 7 bit
        only.  I've written a word CALL for use with the ROM
        routines.  Stack effect is ( HL DE BC PSW ADR -- HL DE
        BC PSW ).  The fig IP is buffered on the way in and
        restored coming out.  It works fine!  ^P toggles the
        printer on and off.  The screen print routine works.
        Next weekend I'll upload the EDITOR that is used in
        STARTING FORTH and some utilities to get you started.
        ENJOY - David O. Rowell