1981-05-28 /k20v7d/01/unsupported/dx20.exe 1983-01-31 /bb-x130a-sb/03/dx20.exe 1985-10-22 /BB-FI82B-DD_1989/01/6,6/dx20.exe 1985-10-22 /BB-T573C-DD_1986/01/6,6/dx20.exe 1986-01-30 /BB-F492Z-DD_1986/04/1,4/dx20.exe 1986-01-30 /BB-F493Z-DD_1986/01/10,7/dx20.exe 1986-01-30 /BB-FP64A-SB_1986/01/10,7/rdreg/dx20.exe 1986-01-30 /tops10_tools_bb-fp64a-sb/01/10,7/rdreg/dx20.exe 1988-09-01 /BB-FI81B-DD_1989/04/1,4/dx20.exe 1988-09-01 /tops10_tools_bb-fp64b-sb/01/10,7/rdreg/dx20.exe