This is an IBM PC/AT (Advanced Technology) Model 5170 computer. It was at the thrift store, and apparently came from the University of Arizona Optical Sciences department (where my brothers worked around 1980). It has an IBM EGA video card, here set to work with the standard IBM 5153 Color Display. I finally found an original IBM 5154 Enhanced Color Display for it, not pictured here. The computer has an 8 mHz 80286 processor, running at 6 mHz, and the full capacity of 512 kbytes of memory on the motherboard. It also has an IBM 30 mb hard disk, and the original 5.25" high density floppy drive. Note that the original cover is still there for the optional floppy drive, usually the cover was thrown away when a 3.5" drive was added. There is the original IBM disk drive controller board inside, this is an extra tall full length board, as it controls both the floppy and hard drives. There is also a Paradise I/O board, with one 9 pin RS-232 port and one parallel port. I added some extra RAM on two BocaRam AT boards, including 128k of conventional, and 3 Mb of extended memory. It has the original DOS 3.30 on it, and I added Windows 1.01 just for fun. [http://www.selectric.org/ibmpc/index.html 22/05/2012]
The IBM RT (or PC/RT or 6150 in Europe) was a 32-bit RISC machine. In fact 'RT' meant 'RISC Technology' where RISC itself was initials of Reduced Instruction Set Computers. This machine was IBM's first try into the single-user workstation world and was the ancestor of the RS/6000 range.
The advantages of RISC technology were smaller processor chips, since they needed less on-chip storage for the instruction set, faster signal transfer between devices, and faster instruction execution since the reduced set was designed so that most instructions was executed in a single clock cycle.
The RISC processor of the 6150 was called ROMP for Reshearch Office Products Division. Its study started in IBM Texas labs in 1977 and a prototype form ran in 1978
There were two RT models, the floor-standing 6150 and the desktop 6151. The differences between them lie in the positioning of some I/O ports and in the storage options available. Despite processor incompatibility with MS-DOS software, the 6150 could run PC software thanks to a PC expansion card holding a Intel 80286 and designed to fit in one of the AT compatible slots of the 6150. the motherboard featured four 32-bit expansion slots to hold the ROMP board, an optional floating-point accelerator board, and two 2 MB RAM boards; two 8-bit and six 16-bit PC slots.
The 6150 operating system was called AIX for Advanced Interactive eXecutive. It succeded to IBM OSes. In fact, it was just an Unix System V with Berkeley 4.2 enhancements and IBM adds for the 6150 environment. Among these adds, the VRM (Virtual Ressource Manager) handled the interface between the Unix kernel and the specific 6150 harware it ran on. A DOS shell was also provided for MS-DOS applications.
Nowadays, one finds RISC processors mainly in numerous small devices like PalmTops or mobile phones. Apple and IBM also use them today, the biggest examples being the PowerPC 7455 (G4) and PowerPC G5 Processor, mostly used in the Power Macintosh and Powerbook series of computers. Many Proprietary Unix systems used them up until only a few years ago (Sun, Silicon Graphics).
[http://www.old-computers.com/museum/computer.asp?c=867&st=1 22/05/2012] http://www.facebook.com/oldcomputers
IBM 1401 was a variable wordlength decimal computer that was announced by IBM on October 5, 1959. The first member of the highly successful IBM 1400 series, it was aimed at replacing electromechanical unit record equipment for processing data stored on punched cards. Over 10,000 units were produced and many were leased or resold in less developed countries after they were replaced with newer technology. The 1401 was withdrawn on February 8, 1971.
[http://en.wikipedia.org/wiki/IBM_1401 22/05/2012]
[http://jjbunn.wordpress.com/2008/09/03/ibm-3090/ 22/05/2012]
In 1990, the ES/9000 models came out with fiber-optical I/O channels (ESCON), and IBM began using the name System/390.
[ http://www.beagle-ears.com/lars/engineer/comphist/ibm360.htm 22/05/2012]
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main memory 128-512 MB 30-100 million instruction per seconds } fourth generation
IBM 7094
monitor/batch operating system
minicomputer
vacuum tube
cycle time of 2 micro sec and 32 k of 36-bit word of core memory
Last ENIAC
time sharing/conversational
second generation
IBM 1620
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[http://www.pattana.ac.th/e-book_yum/com_history/work/historythai.htm 22/05/2012]
Vacuum tube
minicomputer
second generation computer
IBM 1401
1959 "Model T of Business Computers,"
first mass-produced digital, all-transistorized, affordable business computer. The machine was about 5 feet high and 3 feet across. It came with 4,096 characters of memory [6-bit (plus 1 parity bit] CORE memory, constructed from little donut shaped metal rings strung on a wire mesh.
[http://www.computermuseum.li/Testpage/IBM-1401.htm 22/05/2012]
IBM 1401
monitor
batch operating system
second generation
IBM 7090
at NASA during Project Mercury
"large-scale scientific and technological applications"
[http://upload.wikimedia.org/wikipedia/commons/b/b9/NASAComputerRoom7090.NARA.jpg 22/05/2012 ]
minicomputer
Vacuum tube
second generation computer
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