The Free On-line Dictionary of Computing (30 December 2018):

IBM 650

    A computer, produced ca. 1955 and in use in the
   late 1950s, with rotating magnetic drum storage and punched
   card input.  Its memory words could store 10-digit decimal
   numbers and each instruction had two addresses, one for the
   operand and one for address of the next instruction on the
   drum.

   SOAP was its (optimising) assembler.  Languages used on it
   included BACAIC, BALITAC, BELL, CASE SOAP III, DRUCO
   I, EASE II, ELI, ESCAPE, FAST, FLAIR, FORTRANSIT,
   FORTRUNCIBLE, GAT, IPL, Internal Translator, KISS,
   MITILAC, MYSTIC, OMNICODE, PIT, RELATIVE,
   RUNCIBLE, SIR, SOAP, Speedcoding, SPIT, SPUR.

   [More details?]

   (1995-03-30)