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The original IBM Personal Computer, with monitor and keyboard. The IBM Personal Computer, commonly known as the IBM PC, spanned multiple models in its first generation (including the PCjr, the Portable PC, the XT, the AT, the Convertible, and the /370 systems, among others), from 1981 to 1987.
IBM 2812: IBM XIV Storage System (Generations 1 through 3; varies by model) IBM 2851: IBM Scale-Out Network Attached Storage (SONAS) IBM 3310: Fixed FBA drive; IBM 3330: Disk drive. (100 MB each spindle, up to 32 spindles per "subsystem"); 1970 IBM 3336: Disk pack for 3330–1, 3330–2; 1970; IBM 3330-11: Disk drive. Double the density of 3330 ...
The IBM P75 supports up to 16 megabytes of Random-access memory through 4 SIMM slots on the motherboard, each of which can accept a 2 MB or 4 MB 70 nanosecond SIMM. The SIMM must be manufactured by IBM for the computer to accept them – non-IBM SIMMs or generic SIMMs that do not utilise the "presence detect" feature cannot be used unless modified.
The original PS/1 (Model 2011), based on a 10 MHz Intel 80286 CPU, was designed to be easy to set up and use.It featured 512 KB or 1 MB of on-board memory (expandable to 2.5 MB with proprietary memory modules), built-in modem (in American models only) and an optional 30 MB hard disk.
Initially, model 1 (4952, Model C), [4] model 3 (IBM 4953) and model 5 (IBM 4955, Model F [4]) processors were provided. Later processors were the model 4 (IBM 4954) and model 6 (IBM 4956). Don Estridge had been the lead manager on the IBM Series/1 minicomputer. He reportedly had fallen out of grace when that project was ill-received.
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The Personal System/2 Model 60 is a high-end desktop computer in IBM's Personal System/2 (PS/2) family of personal computers. First released in April 1987, the Model 60 features an Intel 80286 processor running at a clock speed of 10 MHz, the same as its midrange counterpart, the Personal System/2 Model 50 .
"There are two versions of the Model 168: the Model 1 and the Model 3." [5]: preface IBM referred to the System/370 Model 168-3 as "the company's previous flagship" [8] when comparing it and the then-new IBM 3033. The 168-3 CPU's internal performance has been described as 5–13% faster than the 168-1. [5]: p.125