Source : Free On-Line Dictionary of Computing

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)