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fbForth 2.0: A File-Based Cartridge Implementation of TI Forth Paperback – August 20, 2017

by Lee Stewart (Author)

4.8 8 ratings

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Forth has been near and dear to my heart ever since I discovered TI Forth in late 1983. Over the years, I worked at converting the TI Forth Manual to a modern document form, while making it clearer and correcting a few errors along the way. In the process, I found myself wishing the TI Forth developers had opted for file I/O for Forth screens (now, blocks) instead of the fig-Forth disk-sector I/O, which made software exchange very difficult. This frustration gave birth to “file-based Forth” known as fbForth 1.0.I added several words to the language that seemed useful, many ported from TurboForth (author: Mark Wills). Adding an 80-column text mode improved the text-mode editor. I have tried to maintain compatibility with TI Forth for the most part.By the time fbForth 1.0 was released, I had become proficient enough in TMS9900 Assembly Language (ALC) that I felt up to the challenge (mostly from Mark Wills’ cajolery) of hoisting fbForth into cartridge space (ROM). Thus was fbForth 2.0 spawned. Only having 32 KiB RAM available for both the Forth resident and user dictionaries forced a relatively small footprint for fbForth 1.0 and TI Forth before it. fbForth 2.0, however, benefited from the much greater space to be had in ROM. It seemed more than sufficient at the time to go with 32 KiB. This allowed for adding many of the optional words to the kernel. I took this opportunity to convert a fair number of words from high-level Forth to ALC, which dramatically increased the speed of the graphics primitives in particular.Porting the Geneve MDOS L10 Floating Point Library to ROM (with permission from Beery Miller of 9640 News) allowed fbForth 2.0 to output three-digit exponents in E-notation. It always puzzled me that the TI developers limited E-notation to two digits in the TI-99/4A’s OS.fbForth 2.0 also features a font editor to allow users to easily modify existing fonts or design their own. Many features suggested by other Forthers have been added as ROM space has allowed, which has required extensive refactoring at times. The 32 KiB ROM is now 98 % full at 502 words. —Lee Stewart

Print length

314 pages
Language

English
Publication date

August 20, 2017
Dimensions

8.5 x 0.71 x 11 inches
ISBN-10

1973932679
ISBN-13

978-1973932673
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Product details

Publisher ‏ : ‎ CreateSpace Independent Publishing Platform (August 20, 2017)
Language ‏ : ‎ English
Paperback ‏ : ‎ 314 pages
ISBN-10 ‏ : ‎ 1973932679
ISBN-13 ‏ : ‎ 978-1973932673
Item Weight ‏ : ‎ 1.99 pounds
Dimensions ‏ : ‎ 8.5 x 0.71 x 11 inches

Best Sellers Rank: #4,122,795 in Books (See Top 100 in Books)
- #14,408 in Programming Languages (Books)

Customer Reviews:
4.8 8 ratings

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4.8 out of 5

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Stephen M.

Fantastic book!

Reviewed in the United States on September 17, 2022

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This is the best book on FORTH since Brady's "Starting FORTH" from long ago!
Excellently laid out and easy to read - straight through, or use for reference.

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Cecil Meeks

If you’re into Forth on the TI, this is for you.

Reviewed in the United States on June 4, 2021

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Amazing book! One of the best books on Forth out there.

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A. Strauss

Very solid, clearly written book. The large page ...

Reviewed in the United States on October 1, 2017

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Very solid, clearly written book. The large page format is also a plus, as it is even easier to read. Of course, fbForth itself is a compelling language which could be considered a necessary addition to any TI-99 system.

2 people found this helpful

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Barry

Five Stars

Reviewed in the United States on May 24, 2018

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Great book

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Gferluga

Lunga vita al TI-99/4a

Reviewed in Italy on October 3, 2020

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Un "romanzo" fantastico...
Da leggere tutto ad un fiato...
Lunga vita al TI-99/4a

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Cix75

Davvero un bel Manuale ! Scritto bene e di ottima qualità.

Reviewed in Italy on June 24, 2018

Verified Purchase

Copertina non rigida ma con una bella stampa. Il Manuale si lascia sfogliare ed è molto ordinato e chiaro. Molti anche gli esempi di programmazione che aiutano ad integrarsi con questo linguaggio. Lo Consiglio !

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