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- MVPFORTH.DOC 15 Oct 1983 R. S. White Marion,IA.
-
- This is a FORTH-79 implementation of the FORTH language
- done by Glen B. Haydon with most of the old fig-FORTH words also
- defined. It has been very generously placed in the public domain
- by Mr. Haydon in the spirit of the original FORTH INTEREST GROUP's
- 1978 dissemination of working versions of the language.
-
- The purpose of this short piece of documentation is to
- steer users to the appropiate references on this language
- implementation and to make some quick notes about my intial
- experences with MVP-FORTH version 1.0305.02.
-
-
- 1. References & Tutorials
-
- A. ALL ABOUT FORTH
- An Annotated Glossary
-
- by Glen B. Haydon
-
- Second Edition
-
- Mountain View Press, Inc.
- P.O. Box 4656
- Mountain View, CA 94040
- (415)961-4103
-
- Order direct from the publisher for approx $25.
- They will take phone in orders and charge to
- M.C., VISA or COD for approx $5 extra.
-
- This is the definitive glossary and definition of
- MVP-FORTH with references to any differences between
- it and FORTH-79, fig-FORTH and the FORTH described
- in STARTING FORTH. The FORTH-79 STANDARD and FORTH-79
- HANDY REFERENCE is included in this book. It is not
- a tutorial!
-
-
- B. STARTING FORTH
-
- An Introduction to the FORTH
- Language and Operating System
- for Beginners and Professionals
-
- by Leo Brodie, FORTH, Inc.
-
- Prentice-Hall, Inc.
- Englewood Cliffs, NJ 07632
-
- Availible at most bookstores, ie DALTON's
- for approx $15.95.
-
- This is an outstanding tutorial book that
- even people who never have any intention to
- learn FORTH give good reviews. (and read through)
- Better yet it appears that Glen Haydon took pains
- to make his implementation of FORTH capable of
- operating like the FORTH described in BRODIE's
- book whenever possible. In particular, the line
- editor included in the MVPFORTH.COM binary image
- complies with the EDITOR described in STARTING
- FORTH. The exceptions to STARTING FORTH are
- pointed out by ALL ABOUT FORTH. These differences
- mainly occur when one is messing around with
- ticking name field addresses ( NFA )'s and stuff
- which is not normal FORTH application programming
- practice and is discouraged by the FORTH-79 STANDARD.
-
- It is possible to do a lot with MVP-FORTH
- and just use STARTING FORTH without buying ALL
- ABOUT FORTH until one feels comfortable with the
- language and wants to get down to the nitty-gritty
- details and write/include decompliers, MSDOS screen
- files, etc.
-
-
- C. FORTH DIMENSIONS, Vol III No. 3
-
- Availible from the FORTH Interest Group
- P.O. Box 1105, San Carlos, CA 94070 by purchasing
- all 6 backissues of Vol III for $15 postpaid.
-
- This issue has an article which provided the
- EDITOR that Glen Haydon implemented in MVP-FORTH.
-
-
-
- 2. other FORTH information sources of note ( not inclusive )
-
- A. Join FIG ( FORTH Interest Group ) and get current
- issues of FORTH DIMENSIONS. This bimonthly magazine
- follows the further refinement of the FORTH language
- standards, has many useful articles about programming
- techniques/tools and seems to be a lively forum about
- FORTH issues in general. Dues are $15 a year.
-
- B. August 1980 issue of BYTE magazine. This FORTH theme
- issue served as the inspiration for many of us FORTH
- latecomers.
-
- C. Dr. Dobb's Journal. Especially the annual FORTH issues
- every September.
-
-
- 3. Startup experiences
-
- I downloaded MVPFORTH.ASM and MVPFORTH.COM (as MVPCOMND.COM)
- using an XMODEM protocol from Gene Plantz's RBBS Chicago bulletin
- board. My display flipped to 40 column colored text mode when I invoked
- the binary file ( it was in 80 col b&w mode ). However normal simple
- FORTH commands and math seemed to work fine. I discovered a control-P,
- not a control-prtsc toggled the printer echo on and off. Just like the
- CP/M-80 versions of FORTH I have used.
-
- The next step was to do a VLIST with the printer echo on and
- see what I got. Hooray! An EDITOR, a 8088 ASSEMBLER, double number
- extensions, fig-FORTH and FORTH-79 equivalences, and the normal misc
- extensions like TRIAD, INDEX, etc. The VOCABULARY worked like the
- FORTH-79 STANDARD with only the EDITOR or the ASSEMBLER being present
- when invoked in addition to the FORTH vocabulary.
-
- A quick glance at the EDITOR words led me to think it worked
- like the fig line editor. I put a couple of new formated disks in
- my drives:
-
- 20 LIST got a bunch of + signs. OK
-
- 20 CLEAR 20 LIST nice 16 * 64 numbered blank screen
-
- L unknown. LIST did not invoke
- the EDITOR vocabulary automatically
-
- EDITOR L worked. got an EDITOR screen display
-
- 0 P line 0 seemed to work
-
- 1 P line 1
-
- L the second " line 1 " was displayed
- on the first line. not working
-
- EMPTY-BUFFERS giving up. I put the original DOS
- disk with MVPFORTH.COM back in drive A
-
- BYE returned to MSDOS OK
-
- I thought I could not do anything till I got ALL ABOUT FORTH in the mail
- from Mountain View Press. The EDITOR seemed to be a line editor like the
- fig version I was familar with, but at first glance seemed to be broken.
-
- The MVPFORTH.ASM kernal source was assembled error free at work
- using the Microsoft MASM assembler. It has very few comments but at least
- I had a good cross-referenced assembler output listing to figure out the
- actions of the FORTH words.
-
- Then I had a recollection about a different kind of FORTH line
- editor described in STARTING FORTH. Those commands work! Now I thought
- it worthwhile to pour over the assembly source and figure out what was
- flipping my USI Multidisplay video adapter to 40 columns. The PAGE
- command vectored to <PAGE> which did an INT 10H bios rom video call with
- 0 in the AL register and 0 in the AH register. That will do it. I had
- to do that INT call with 2 in the AL register. Here is the code that
- will fix the 40 column problem for those of you who use cheaper 15.75 kHz
- composite B&W monitors or expensive RGB monitors with the color graphics
- adapter:
- DECIMAL
-
- : <PAGEW> 2 0 0 0 16 INTCALL DROP ;
-
- FIND <PAGEW> 'PAGE ! ( save new code version in PAGE
- vector )
-
- FREEZE ( now can't FORGET what was just
- done )
-
- SAVE-FORTH ( saves memory image of MVPFORTH
- on MSDOS disk A: as COMMAND.COM )
-
-
-
- and here is a quickie that will blank all 160 blocks on a 5.25"
- single-sided disk (8 sectors per track) which is what MVPFORTH
- defaults to:
-
- DECIMAL
- : IDISK 160 0 DO I CLEAR LOOP ;
-
- The CONFIGURE word will let you declare your drives to be double-sided
- and give you blocks 0 to 359 availible instead of 0 to 159. Try it,
- its menu driven.
-
-
-
- Naturally after doing the above I finally got my hands on a
- borrowed copy of ALL ABOUT FORTH and verified that what I had just done
- was ok. That's like reading the instructions after putting the child's
- bike together.
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