IBM 2361 Large Capacity Storage

IBM 2361Large Capacity Storage (LCS)
The IBM 2361 Large Capacity Storage (LCS) is an optional component of the IBM System/360 models 50, 65 (when not being used as a multiprocessor), and 75 computers.wikipedia
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IBM System/360

System/360IBM 360IBM/360
The IBM 2361 Large Capacity Storage (LCS) is an optional component of the IBM System/360 models 50, 65 (when not being used as a multiprocessor), and 75 computers.
Up to 8 megabytes of slower (8 microsecond) Large Capacity Storage (LCS) was also available.

IBM System/360 Model 50

360/5050Model 50
The IBM 2361 Large Capacity Storage (LCS) is an optional component of the IBM System/360 models 50, 65 (when not being used as a multiprocessor), and 75 computers.
The system can also attach IBM 2361 Large Capacity Storage (LCS) modules which provide up to 8,388,608 bytes of additional storage, however with a considerably slower memory cycle time of 8 microseconds compared to the 2 microseconds of processor storage.

Multiprocessing

multiprocessormulti-processormulti-processing
The IBM 2361 Large Capacity Storage (LCS) is an optional component of the IBM System/360 models 50, 65 (when not being used as a multiprocessor), and 75 computers.

Magnetic-core memory

core memorymagnetic core memoryferrite core memory
Storage is implemented using magnetic cores; the cycle time is 8 microseconds and the access time is 3.6 microseconds.

Access time

ATdelaylatencies
Storage is implemented using magnetic cores; the cycle time is 8 microseconds and the access time is 3.6 microseconds.

Computer data storage

main memorystoragememory
It provided additional main storage with a slower access time than the standard storage of the machine—for example its 8μsec compares to 750nsec for main storage on the Model 65.

NASA

National Aeronautics and Space AdministrationNASA Advisory CouncilU.S. space program
The IBM 2361 was also provided to NASA for use on their IBM 7094 real-time system, where it supplied 524,000 36-bit words of additional memory.

IBM 7090

IBM 709470907094
The IBM 2361 was also provided to NASA for use on their IBM 7094 real-time system, where it supplied 524,000 36-bit words of additional memory.

Interleaved memory

interleavedinterleavingmemory interleaving
If a system contained an even number of IBM 2361 components and at least one model 65 or model 75 processor, the IBM 2361s could be interleaved to improve sequential access time.

Sequential access

sequentialsequentiallySequential I/O
When doing sequential access, one IBM 2361 could complete its cycle while the other IBM 2361 was starting the next cycle.

OS/360 and successors

OS/360MVTOS/MVT
OS/360 allows the user to request memory in either processor storage ("hierarchy 0") or the slower LCS ("hierarchy 1").

Linker (computing)

linkerlinkedlinkers
The OS/360 linkage editor also provides a control statement to assign specific control sections to a particular hierarchy, thus a program can be split into sections to run in processor storage and sections to run in LCS.

OS/360 Object File Format

control sectionsOS/360
The OS/360 linkage editor also provides a control statement to assign specific control sections to a particular hierarchy, thus a program can be split into sections to run in processor storage and sections to run in LCS.

IBM System/360 Model 65

65Model 65360/65
The system can also attach IBM 2361 Large Capacity Storage (LCS) modules which provide up to 8MB of additional storage, however with a considerably slower memory cycle time of 8 microseconds compared to the 750 nanoseconds of processor storage.

List of IBM products

IBM 5153See products listingbusiness intelligence and performance management products

IBM System/360 Model 67

IBM System/360-67System/360 Model 67Model 67
Note that while Carnegie Tech had a 360/67 with an IBM 2361 LCS, that option was not listed in the price book and may not have worked in a duplex configuration.