摘要： <正>IBM公司自 1981年底宣布IBM PC之后,于1982年推出了 IBM PC/XT,1983年底宣布了 IBM PC/XT/370、 IBM3270-PC和 IBM5550多工作站,1984年9月又推出了高档微型机IBM PC/AT。 IBM PC/AT采用 6 MHz的 Intel80286为CPU。 80286有与 8086兼容的实地址工作方式和保护虚地址工作方式,能够执行 Intel 8086的所有指令。PC/AT使用单用户的 DOS 3. 0和DOS3.1操作系统,它与 PC DOS 2.0以上的版本兼容,DOS 3.1支持 IBM新的网络,

Abstract: In this paper the characteristics and performance evaluation of IBM PC/AT are described. PC/AT is tested by a set of highlevel language benchmarks and compared with IBM PC. Dual Systems 83/20 and ai-M 16. The results show that IBM PC/AT is faster than Dual Systems 83/20, and is nearly twice faster than IBM PC. A set of assembly language benchmarks is also programmed to test the Intel 80286, and Intel 8086、8088 with or without Numeric Data Processor 80 × 87. The results show that the average computing speeds of the microprocessors are nearly increased twice by using Numeric Data Processor, and 6 MHz 80286 is nearly twice farter than 4.77 MHz 8088.