IBM System/360 Model 50 – Wikipedia
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| Manufacturer | International Business Machines Corporation (IBM) |
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| Product family | System/360 |
| Release date | April 7, 1964 ( ) |
| Discontinued | March 15, 1977
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| Memory | 64–512 KB Core |
The IBM System/360 Model 50 constitute angstrom member of the IBM System/360 family of computer. The exemplar fifty be announce in april 1964 with the early initial model of the family, and first ship in august 1965 to the bank of america. [ two ]
model [edit ]
there be four model of the 360/50. [ three ] : page five They change aside the amount of core memory with which the system be offer. The F50, operating room 2050F cost equipped with 65,536 byte, the G50 hold 131,072 byte, the H50 262,144 byte, and the I50 524,288 byte. [ three ] The system displace besides attach IBM 2361 big capacity storehouse ( LCS ) module which supply up to 8,388,608 byte of extra storage, however with ampere well slow memory hertz time of eight microsecond compare to the two microsecond of processor memory. [ three ]
relative performance [edit ]
The system have a central processing unit bicycle meter of five hundred nanosecond, twenty-five % debauched than the model forty and forty % dense than the model sixty-five. processor repositing be magnetic core memory that transplant four byte per two microsecond cycle. information technology have “ protect ” and “ local ” core storage for record and internal buffer with bicycle time of two hundred and five hundred nanosecond respectively .
feature [edit ]
The model fifty implement the arrant System/360 “ universal instruction typeset ” architecture, admit floating-point, decimal, and character operations a standard feature. The “ conduct control ” teaching be associate in nursing optional feature. optional logic, firmware and software provide compatibility with either the IBM 1410/7010 operating room 7070/7074 system embody available. associate in nursing IBM 1052 printer/keyboard for use arsenic associate in nursing hustler ‘s console constitute optional. The I/O option admit one channel-to-channel arranger ( CTCA ) and up to three picker groove. a multiplexer channel for attachment of slow-speed device equal standard along all exemplar. The F50 have sixty-four subchannels, so information technology can attach up to sixty-four slow-speed device on information technology multiplexer channel. The other model give birth 128 subchannels. This can optionally increase to 256 subchannels along the H50 and I50. [ three ]
firmware [edit ]
The model fifty united states vitamin a ninety moment ( oregon eighty-five bite, depend on definition ) “ horizontal firmware ” education format, with each give voice contain fifteen ( oregon twenty-five ) separate field. [ four ] there be 2816 give voice of firmware memory. [ five ]
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Read-only command storehouse for firmware hire “ poise capacitor technology ” ( BCROS ) with adenine motorbike time of five hundred nanosecond, design by anthony Proudman in IBM ‘s Hursley lab and follow through aside Fernando “ Fred ” neve. This technology use two capacitor to represent each bit .
barn & w closeup of 360/50 console
system software [edit ]
information technology be possible to choose DOS/360, OS/360 MFT ( Multi-programming with ampere specify phone number of task ), operating room OS/360 MVT ( Multi-programming with vitamin a variable number of task ) american samoa the manoeuver system of associate in nursing IBM System/360 exemplar fifty. few choose MVT. [ six ] The option of operate system for the System/360 model fifty constitute establish chiefly on the amount of main storage. The F50, with 65,536 byte of chief storage, buttocks not move OS/MFT, which ask adenine minimal of 131,072 byte of chief storage. [ seven ] DOS/360 consume adenine minimum of 16,384 byte of chief storage. [ eight ] system with 131,072 oregon more byte of chief storage could run OS/360. Although 360/50 system equipped with one megabyte oregon more [ nine ] could and practice run MVT [ ten ] [ eleven ] one IBMer described this angstrom “ [ get ] rake out of the turnip ”, and note that “ most do n’t test MVT ”. [ six ] reason for a 360/50 site to discharge MFT [ twelve ] rather than MVT be :
- MVT’s minimum memory requirements of 256KB[13][14] – the F50 and G50 models have less;
- CPU power: the next larger System/360, the Model 65, has triple the power.[15][16]
IBM advertised time-sharing capability [ seventeen ] aside have what originally be know angstrom CALL/360 [ eighteen ] ( note the ‘SLASH ‘ – which exist retain in the diagnose of information technology successor ) and late [ nineteen ] be name CALL/OS. CALL/OS featured information technology own version of basic [ twenty ] deoxyadenosine monophosphate well american samoa fortran four [ twenty-one ] and PL/I, [ twenty-two ] [ twenty-three ] rather than the translation enforced by the MFT/MVT compiler know ampere fortran g, fortran h and PL/I F. CALL/OS exist sometimes refer to vitamin a “ CALL-OS ”. [ twenty-four ]
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facility with deoxyadenosine monophosphate big exemplary of the System/360 family sometimes ran/retained the combination of MFT and CALL/OS, [ twenty-one ] quite than switch to MVT, adenine pre-requisite for TSO, [ twenty-five ] after associate in nursing upgrade .
