1982-04-13 /BB-M836A-BM/01/tools/alu/alu.exe 1982-10-25 /BB-M836B-BM/01/tools/alu/alu.exe 1982-10-25 /bb-j710b-bm_tops20_v41_tools/01/tools/alu/alu.exe 1985-07-02 /BB-M836C-BM/01/tools/alu/alu.exe 1985-07-02 /bb-m836c-bm_tops20_v6_1_tools/01/tools/alu/alu.exe 1988-03-10 /k20v7c/01/tools/alu.exe 1988-05-27 /bb-m836d-bm/01/tools/alu/alu.exe 1988-05-27 /tops20_version7_0_tools_tape_clock_tape/01/tools/alu/alu.exe