Source : Free On-Line Dictionary of Computing

UBASIC
     
        Yuji Kida .
     
        An extension of {BASIC} for {symbolic mathematics} and {number
        theory}.
     
        UBASIC supports {bignum}s, fractions, complex numbers,
        polynomials and integer factorisation.  It runs under {MS-DOS}
        and is written in {assembly language}.
     
        Current 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)