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BASIC-E was developed by Eubanks for Gary Kildall's new CP/M operating system while both men were at the Naval Postgraduate School in Monterey, CA. Because it was developed at public expense, BASIC-E is in the public domain and cannot be commercially marketed. Seymour Rubinstein, the marketing director of IMSAI contacted Eubanks and asked him to create a saleable version under contract for the IMSAI 8080 microcomputer. Eubanks developed CBASIC in his spare time while he was still a naval officer stationed on the submarine USS George Washington at Vallejo, California. He retained joint ownership of the program with IMSAI, and sold the program through his own company, Compiler Systems, until it was acquired by Digital Research in 1981.
BASIC-E and early versions of CBASIC compiled source code into an intermediate p-code file, which was then executed by a separate run-time interpreter program. CBASIC could execute in a minimum of 24 kB of memory. Line numbers in the program source were optional, unless needed as a label for a program jump. CBASIC proved very popular because it incorporated BCD math which eliminated MBASIC's rounding errors that were sometimes troublesome for accounting.
- Gordon Eubanks own story of BASIC-E and CBASIC
- BASIC-E Reference Manual (December 1976)
- CBASIC 2 Reference Manual (Table of contents on p. 115) November, 1981
- Another CBASIC description
- Alternate CBASIC history
- cbc a CBASIC to C converter
- Implementation in 6502 assembler
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