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Two, 16 bit MCA slots (top and middle). At the bottom is an MCA slot for an IBM 8514 card.. Micro Channel architecture, or the Micro Channel bus, is a proprietary 16-or 32-bit parallel computer bus publicly introduced by IBM in 1987 which was used on PS/2 and other computers until the mid-1990s.
The Personal System/2 Model 70 386 and Personal System/2 Model 70 486 are midrange desktop computers in IBM's Personal System/2 (PS/2) family of personal computers. The PS/2 Model 70 386, released in June 1988, features an Intel 386 microprocessor clocked between 16 MHz and 25 MHz (depending on the submodel) and features the 32-bit Micro Channel architecture (MCA) bus; the Model 70 486 ...
Explanatory notes. Built-in or optional monitors are CRTs unless mentioned otherwise.; The Space Saving Keyboard is a 87-key numpad-less version of the Model M. [1]The 25 Collegiate, intended for college students, had two 720 KB floppy drives, maxed out the RAM to 640 KB, and came packaged with the official PS/2 Mouse, Windows 2.0, and four blank floppy disks.
The Personal System/2 or PS/2 is IBM's second generation [1] [2] of personal computers. Released in 1987, it officially replaced the IBM PC , XT , AT , and PC Convertible in IBM's lineup. Many of the PS/2's innovations, such as the 16550 UART (serial port), 1440 KB 3.5-inch floppy disk format, 72-pin SIMMs , PS/2 port , and VGA video standard ...
Although the MCA bus had a slight performance advantage over EISA (bus speed of 10 MHz, compared to 8.33 MHz), EISA contained almost all of the technological benefits that MCA boasted, including bus mastering, burst mode, software-configurable resources, and 32-bit data/address buses. These brought EISA nearly to par with MCA from a performance ...
In July 1987, [16] IBM shipped the PS/2 Model 80, their first personal computer with the 32-bit i386 processor, in an identical tower case to the Model 60. [4] Unlike the Model 60, the Model 80 features several 32-bit MCA slots, allowing the computer to take full advantage of the most advanced Micro Channel cards on the market.
The PS/2 Model 50 was introduced in April 1987 alongside the lower-end Model 30 and the higher-end Model 60.The PS/2 Model 50, as well as the Model 60, served as the public market introduction of the Micro Channel architecture (MCA), a proprietary bus standard designed by IBM to replace the aging Industry Standard Architecture (ISA) first used in their earlier IBM PCs.
Reply Corporation, often shortened to Reply Corp., was an American computer company based in San Jose, California.Founded in 1988 by Steve Petracca, the company licensed the Micro Channel architecture from IBM for their own computers released in 1989, competing against IBM's PS/2 line.