It was one of the first WYSIWYG word processors that could write mathematical formulas, even on IBM PC XT computers. It was easier to use than TeX. It was relatively affordable[7] and ran on personal computers, unlike TeX, which ran on expensive Unix computers[citation needed].
ChiWriter was discontinued in 1996.[1] Since then, Horstmann has placed the ChiWriter executable in the public domain.[8] The source is unpublished.[9]
Operation
ChiWriter let a user write text that was subscripted or superscripted with respect to the current text line (above or below, by half the base line height). This text was treated as part of the core line, enabling complex formulae, such as fractions. It supported up to 20 fonts simultaneously, including fonts with Greek, Cyrillic, and mathematical symbols. Users could combine symbols to create larger objects, such as sums and integrals. Thus, ChiWriter facilitated writing mathematical and scientific texts.
It was easier to use than TeX, making it popular with scientists.[citation needed] It focused on speed of use and on interactive editing, rather than on control over styling.[2]
Though it was a DOS application, it used graphics display modes, implementing its own GUI.[10] It used its own with fixed width, bitmap fonts (not vector fonts). Every font had the same fixed dimensions, but different sets were available for different output devices (for example, low-resolution fonts for video displays and high-resolution fonts for printers). A font editor allowed one to modify fonts and to add user-designed symbols and new fonts, including proportional fonts.
History
In 1988, Horstmann Software Design Corporation was advertising ChiWriter as "completely 'what-you-see-is-what-you-get'" along with several optional components, such as support for graphics beyond EGA, 24-pin dot-matrix printers, and laser printers.[7] A combination of market forces led to the company's demise.[10] In 2001,[b] Horstmann wrote:
Q: Why was there never a Windows version of ChiWriter? A: In a word, we ran out of money. A team of four programmers was working on the Windows version, when the Windows 3.0 popularity made DOS programs hard to sell. When sales dropped, we had to lay off the programmers one by one. At the same time, Microsoft Word became more powerful and set a minimum standard for what a word processor would need to deliver. The "suite wars" that put a word processor on many computers for free didn't help. Eventually, we just had to throw in the towel.[11]
Access to old ChiWriter documents today
Via conversion to TeX
Horstmann Software Design sold a ChiWriter-to-TeX converter. This is not available from Horstmann's website.[12]
Via laser output
As of 2020,[13] ChiWriter can run on modern computers, in a virtual machine runnning DOS. Virtualizers known to work include VirtualBox and DosBox.[13] Once ChiWriter is running, assuming it has the laser printing option, use it to output a PostScript (*.ps) file from each document. PostScript is readily convertible to PDF.
Via dot-matrix output
ChiPBM is a program written in C[c] by Dmitry Zaitsev, to convert dot-matrix output from ChiWriter.[14] It understands the subset of Epson ESC/P codes emitted by ChiWriter, and outputs portable bitmap data (PBM).[15] This is an output format for graphics, that is still used in 2025.
ChiPBM was announced by Zaitsev in February 2017, through self-promotion on Wikipedia.[15] It is apparently freeware: the source code seems unpublished[14] and the executable can be downloaded free of charge.[16][d] As of December 2025, the ChiPBM executable on Zaitsev's website is built for x86-64 computers running Microsoft Windows.[c] There is no manual.[c]
Instructions: use ChiWriter to print-to-file in "quality printing mode". This creates a *.bin file, containing bitmap graphics and ESC/P codes. Then, run ChiPBM to convert the *.bin file to a *.pbm file.[15] Use other tools to convert PBM to common document formats. For example, the graphics editor GIMP can convert PBM to PDF.
External links
ChiWriter FAQ - Horstmann's hidden[17] ChiWriter page. Includes downloadable copies of ChiWriter versions 3 and 4.
daze.ho.ua - Zaitsev's software page, including ChiPBM.
Notes
↑The programming languages used for Chiwriter are easily determined from strings embedded by the compilers into the executables. But compilers aren't obligated to identify themselves. So, other languages may have been used too. 8088 assembly is likely to have been used in some places. This would be a fair guess for the miniscule executable marked "unknown" below.
$ wget https://horstmann.com/ChiWriter/cw4.zip $ unzip cw4.zip # the last version still on Horstmann's site; file dated 2015-12-04. ... $ ls -l *.EXE -rw------- 1 bw bw67702 Oct 192007 324.EXE -rw------- 1 bw bw 683152 Oct 192007 CW.EXE -rw------- 1 bw bw50034 Oct 192007 DOCUMENT.EXE -rw------- 1 bw bw16684 Oct 192007 FCS.EXE -rw------- 1 bw bw85156 Oct 192007 FD.EXE -rw------- 1 bw bw41876 Oct 192007 MAINT.EXE -rw------- 1 bw bw941 Oct 192007 PALETTE.EXE -rw------- 1 bw bw17032 Oct 192007 PINSTALL.EXE -rw------- 1 bw bw62430 Oct 192007 TESTSCR.EXE
$ file *.EXE 324.EXE:MS-DOS executable, MZ for MS-DOS CW.EXE: MS-DOS executable, MZ for MS-DOS DOCUMENT.EXE: MS-DOS executable, MZ for MS-DOS, ZIP self-extracting archive FCS.EXE:MS-DOS executable, MZ for MS-DOS FD.EXE: MS-DOS executable, MZ for MS-DOS MAINT.EXE:MS-DOS executable, MZ for MS-DOS PALETTE.EXE:MS-DOS executable, MZ for MS-DOS PINSTALL.EXE: MS-DOS executable, MZ for MS-DOS Self-extracting PKZIP archive TESTSCR.EXE:MS-DOS executable, MZ for MS-DOS
$ L=`file *.EXE|sed '/archive/d;s/:.*//'` $ for j in $L; do > echo $j: > strings $j|egrep -m1 'Borland|Turbo|Zortech'|| echo unknown > done | > sed '/:$/! s/^//'
324.EXE: Borland C++ - Copyright 1991 Borland Intl. CW.EXE: Borland C++ - Copyright 1991 Borland Intl. FCS.EXE: Turbo C++ - Copyright 1990 Borland Intl. FD.EXE: Borland C++ - Copyright 1991 Borland Intl. MAINT.EXE: Turbo-C - Copyright (c) 1988 Borland Intl. PALETTE.EXE: unknown TESTSCR.EXE: Zortech C 3.0r1 library, Copyright (C) 1988-1991 S, written by Walter Bright
↑The Internet Archive's earliest timestamp for the web page that once contained this text is 23 September 2001 (and the snapshot was taken on 31 January 2002). But the page may have existed earlier and the quoted words may have been present in those earlier versions.
123Metadata embedded in the ChiPBM executable, dated 17 June 2023: $ wget http://daze.ho.ua/chipbm.exe 2025-12-26 19:59:23 URL:http://daze.ho.ua/chipbm.exe [136021/136021] -> "chipbm.exe" [1]
$ ls -l chipbm.exe -rw------- 1 bw bw 136021 Jun 17 2023 chipbm.exe
$ file chipbm.exe chipbm.exe: PE32+ executable (console) x86-64, for MS Windows
$ unzip chipbm.exe # is it a self-extracting archive (a package)? No. So, no documentation: Archive: chipbm.exe End-of-central-directory signature not found. Either this file is not a zipfile, or it constitutes one disk of a multi-part archive. In the latter case the central directory and zipfile comment will be found on the last disk(s) of this archive. unzip: cannot find zipfile directory in one of chipbm.exe or chipbm.exe.zip, and cannot find chipbm.exe.ZIP, period.
$ strings chipbm.exe |grep -m1 'GNU C' GNU C 4.9.2 -m64 -mtune=generic -march=x86-64 -g -O2 -std=gnu99
↑HTTP header fields, from the ChiPBM executable's URL, accessed on 26 December 2025: Content-Type: application/x-msdownload Last-Modified: Sat, 17 Jun 2023 18:02:33 GMT ETag: 21355-5fe571b136bb1 Content-Length: 136021
References
12Horstmann, Cay (2025-09-26), ChiWriter FAQ, retrieved 2025-12-28, ChiWriter is a scientific word processor that was sold by Horstmann Software Design Corporation between 1986 and 1996. As of July 1, 1996. ChiWriter is no longer sold or supported.
12van den Eijnde, Joop (2011-01-20), ChiWriter and user applications, retrieved 2025-12-28, The disadvantage is of course that no styles are supported that can be defined and modified globally, except in the very last version 4.20 there is a primitive support for styles.
↑Horstmann, Cay (2025-09-26), ChiWriter FAQ, retrieved 2025-12-28, Q: How do I get the software? A: Here is what I have: Version 3 |Version 4.
↑"Software Spotlight: ChiWriter 4.00", WinWorld, 2017-04-02, retrieved 2025-12-28, Version 4.20B for DOS was the last version, and no version was produced for Microsoft Windows.
↑"ChiWriter 4.2", WinWorld, 2025-12-28, retrieved 2025-12-28, Release date 1993
↑Horstmann, Cay (2025-09-26), ChiWriter FAQ, retrieved 2025-12-28, Q: Can I legally run ChiWriter? A: Yes. It is now in the public domain.
↑Horstmann, Cay, ChiWriter FAQ, archived from the original on 2002-01-31, retrieved 2025-12-28, Q: Why don't you just make ChiWriter freeware or shareware? A: I supported ChiWriter for about three years after it ceased to generate revenue. At this point, support is no longer feasible. If new people started using it, I would have to personally support everyone who sends me questions, or at least personally remove all questions from my email and voice mail.
12van den Eijnde, Joop (2011-01-20), ChiWriter and user applications, retrieved 2025-12-28, It creates its own graphic screen, and some of the resolutions offer mouse support. However, the lack of true Windows support probably led to the downfall of ChiWriter.
↑Horstmann, Cay (2001-09-23), ChiWriter FAQ, archived from the original on 2002-01-31, retrieved 2025-12-28
↑Horstmann, Cay, ChiWriter FAQ, archived from the original on 2002-01-31, retrieved 2025-12-28, Q: You used to sell a ChiWriter to TeX converter. Is it still available anywhere? A: No.
12Zaitsev, Dmitry (2023-06-17), Software of Dmitry Zaitsev, retrieved 2025-12-26, chipbm: seam to pdf/djvu your good old stashes in ChiWriter format using this converter of ChiWriter .bin file, containing bit-image print codes Epson Esc/P, into a black-white bitmap
123Zaitsev, Dmitry (2017-02-23), ChiWriter: Difference between revisions - Wikipedia, retrieved 2025-12-26, Recently people experience some difficulty with exhibiting ChiWriter documents. A simple solution takes into consideration the fact that in the quality printing mode ChiWriter outputs bit-image print codes which can be redirected into a file (default extension .bin). In the heydays of the editor, the codes Epson ESC/P were the most frequently used. Utility [http://daze.ho.ua/softe.htm ChiPBM] converts used by ChiWriter subset of bit-image print codes into a file Portable anymap (.pbm) which is loaded by many graphical utilities. For example, utility gimp allows saving a page afterwards in Portable Document Format (.pdf). For creating .bin files containing bit-image print codes, we can launch the editor under MS-DOS in VirtualBox.
↑Zaitsev, Dmitry (2023-06-17), ChiPBM executable, archived from the original on 2023-11-26, retrieved 2025-12-26
↑discussion in the article's Wikipedia Talk page., 2025-12-30, retrieved 2026-01-01, This led me to discover that [https://horstmann.com/ Cay Horstmann's home page]now links to this Wikipedia article instead of the deleted page on his own site, which is an interesting choice [[User:ClaudineChionh]] Huh! He orphaned his ChiWriter FAQ page! The page is still on the server and it isn't an island -- it's reachable through Wikipedia (and through [https://www.delfijn.nl/ChiWriter/chiappl.htm Joop van den Eijnde's web page] maybe from others too) but... Huh! Yeah, that's messed up! [[User:Black_Walnut]]
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