The Free On-line Dictionary of Computing (18 March 2015):

UBASIC Yuji Kida. An extension of BASIC for symbolic mathematics and number theory. UBASIC supports bignums, fractions, complex numbers, polynomials and integer factorisation. It runs under MS-DOS and is written in assembly language. Latest version: 8. (ftp://ftp.simtel.com/math/utk/software/msdos/number.theory/ubasic/). [Review, W.D. Neumann, Notices of AMS 36 (May/June 1989)] ["A math-oriented high-precision BASIC", Notices of the A.M.S, 38 (Mar 1991)]. (1992-07-06)