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RoleofInterfaceManipulationStyleandScaffoldingon：作用界面操作风格和脚手架.doc

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A PDP-8 Emulator Program Brian J. Shelburne Wittenberg University ________________________________________________________________________ The clean, simple, and elegant architecture of the classic PDP-8 makes it an ideal candidate for studying concepts in computer organization. The PDP-8 Emulator Program allows a user to write, edit, assemble, debug, trace and execute PDP8 machine code and PDP-8 assembler language programs. With it the user can obtain a feel for the PDP-8. The PDP-8 Emulator Program includes a simple built-in text editor which is used to write and edit PDP-8 Assembler Language programs, an assembler to translate these programs into PDP-8 machine code and a virtual PDP-8 engine upon which to execute the code. PDP-8 code can be executed from a debug screen display that allows the user to observe the contents of registers and memory as the code executes or code can be executed using an I/O interface that requires userwritten PDP-8 I/O routines. This paper provides an introduction to both the PDP-8 architecture and PDP-8 Assembler Language and discusses how to use the PDP-8 Emulator Program. The PDP-8 Emulator Program runs under MSDOS in a Command window. Categories and Subject Descriptors: C.0 [Computer Systems Organization – General]: Modeling of Computer Architecture; B.0 [Hardware]: General: PDP-8; I.6.5 [Simulation and Modeling]: Model Development; K.2 [History of Computing]; K.3.1 [Computers and Education]: Computer Uses in Education General Terms: Design Additional Keywords and Phrases: computer architecture simulator, education ________________________________________________________________________ 1. INTRODUCTION The PDP8 Emulator Program (pdp8main.exe) simulates the PDP8 architecture on an Intel 80x86 computer. With it a user can edit and execute PDP-8 machine code or PDP-8 assembler language programs and thereby develop a feel for the PDP-8. The design philosophy behind the PDP-8 Emulator Program was to incorporate as much as possi