Assembler language (Computer program language) 42 Programming 34 IBM 370 (Computer) 6 IBM 360 (Computer) 5 IBM Personal Computer 5 Intel 8088 (Microprocessor) 4 Intel 8080 (Microprocessor) 3 6502 (Microprocessor) 2 Microcomputers 2 Minicomputers 2 PDP-11 (Computer) 2 Structured programming 2 VAX-11 (Computer) 2 Zilog Z-80 (Microprocessor) 2 Apple IIc (Computer) 1 Apple IIe (Computer) 1 CALM (Computer program language) 1 COBOL (Computer program language) 1 Computer architecture 1 Computer organization 1 Computer programming 1 DECSYSTEM-20 (Computer) 1 Debugging in computer science 1 FORTRAN (Computer program language) 1 Handbooks, manuals etc 1 IBM Personal Computer XT 1 IBM Personal System/2 (Computer system) 1 IBM computers 1 Intel 8080A (Microprocessor) 1 Intel 8085 (Microprocessor) 1