# ThunderByte Antivirus

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Early antivirus software

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**ThunderBYTE Anti-Virus** (TBAV) was an early [antivirus software](/source/Antivirus_software) product. It was created by [Dutchman](/source/Netherlands) Frans Veldman in 1988, and published by his company, ESaSS B.V. It was mainly designed for [DOS](/source/DOS), but there were also versions supporting [Microsoft Windows](/source/Microsoft_Windows). TBAV was known for its fast scan speed, heuristics-based scanner, and Anti-Vir.Dat files tracking known-good file information ([checksums](/source/Checksum)).[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*]

Originally ThunderBYTE used a dedicated [ISA](/source/Industry_Standard_Architecture) card to provide protection before the [operating system](/source/Operating_system) was even loaded. Later, a software-only product was released, which soon displaced the hardware offering. It was distributed as [shareware](/source/Shareware).

In 1998, TBAV was sold to [Norman ASA](/source/Norman_ASA),[1] which discontinued ThunderBYTE as a product.

## References

1. **[^](#cite_ref-1)** Writer, CBR Staff (April 7, 1997). ["NORMAN DATA DEFENSE BUYS EUROPEAN WINTEL ANTI-VIRUS PARTNER"](https://techmonitor.ai/technology/norman_data_defense_buys_european_wintel_anti_virus_partner). *Tech Monitor*. Retrieved December 8, 2023.

## External links

- Javier Gutiérrez Chamorro (June 8, 2008). ["ThunderBYTE Antivirus"](http://www.javiergutierrezchamorro.com/thunderbyte-antivirus/1236). *javiergutierrezchamorro.com*.

- ["ThunderBYTE Anti-Virus Utilities User Manual"](http://files.mpoli.fi/unpacked/software/antivir/tbav805.zip/tbav.txt). 1996. Retrieved February 10, 2016 – via Metropoli BBS files.

- Frans Veldman. ["The conclusion of Thunderbyte Anti Virus"](https://web.archive.org/web/20111209213646/http://harisha.home.xs4all.nl/frans/dutch/tbav.htm). Archived from [the original](http://www.xs4all.nl/~harisha/frans/dutch/tbav.htm) on December 9, 2011.

- Righard J. Zwienenberg. ["TBAV"](http://zwienenberg.org/righard/tbav.htm). Retrieved February 10, 2016.

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Adapted from the Wikipedia article [ThunderByte Antivirus](https://en.wikipedia.org/wiki/ThunderByte_Antivirus) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/ThunderByte_Antivirus?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.