#author("2018-07-02T15:21:56+09:00","","")
#author("2018-07-02T15:24:12+09:00","","")
[[Wiki Schedule]]

*IBM System 370 [#ed9101cd]
#ref(product-79942.jpg,center,50%)
[[Image Source:http://www.computinghistory.org.uk/det/31058/IBM-System-370-Control-Panel/]]

- backward compatible with system 360

** Overview [#g4a32c0b]
Bits
- 32-bit

Type
- Register-Register
- Register-Memory
- Memory-Memory

Encoding
- Variable (2, 4 or 6 bytes long)

Floating point
- 4 64-bit

Main architectural improvements
-monolithic memory
-change from 24 to 32 bits
-attached disk storage

** Initial Models [#s6e21fe7]
Has core memory —> doesn’t support virtual storage

** Model 145 & Advanced Function[#g42be8e8]
- First computer using a main memory made from monolithic circuits
-- Performs all the calculations
- "The use of monolithic memory technology, with its very high circuit density, allows IBM to offer Model 145 users more than a half-million characters of high-speed storage in about half the space that would be required by core planes for an equivalent amount of memory. "((https://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3145.html))
- Uses silicon memory chips rather than magnetic core technology
- Virtual storage was introduced
-- Fun fact: it was smuggled into the CSC

** Address Space[#qda506de]
- S/370-XA: expanded the address space from 24 bits to 31 bits
-- "wanted to reserve the high-order bits for control or escape bits"
- ESA/370: 16 32 bit access registers were added

**Architecture [#w4085403]
- Big endian byte ordering
- single or multiprocessor 
-- has the interruption mechanism
- memory
- manual control operations: allows for bootstrap and resetting the system
- I/O mechanism

*Different Models [#v4563178]
**System/370 Model 115 [#ud562f1e]
-directly attached disk drives (3340 disk drives)
-could be configured with 64K or 94K bytes of memory

**System/370 Model 125 [#j3db2b2b]
- 3333 disk storage attached
- 96K or 128K bytes of memory

**System/370 Model 135 [#b1dbc05e]
-IBM 1400 series (1401, 1440 and 1460) emulation was also offered as memory
- " a reading device located in the Model 135 console" allowed updates

**System/370 Model 138 [#e3324a17]
- 512K or 1 MB of memory

**System/370 Model 145 [#s17bae38]
(See above)

**System/370 Model 148 [#f1999f05]
:  )

**System/370 Model 155 [#fd57d187]
- ran the non-virtual memory

** System/370 Model 158 [#a051ffa1]
- included dynamic address translation--> prerequisite for virtual memory systems
- some form of multiprocessor was made available

** System/370 Model 165 [#t5c6fbe3]
:  )

** System/370 Model 168 [#qe80d281]
- supported up to 8MB of main memory

** System/370 Model 195 [#u73aed13]
:  )

**IBM 303X [#r2237924]
- multiprocessor version of 3033
Main article: IBM 303X

**IBM 308X [#h1dbd419]
(From wikipedia)
-The 3081[36] (announced Nov 12, 1980) had 2 CPUs
-The 3083[37] (announced Mar 31, 1982) had 1 CPU
-The 3084[38] (announced Sep 3, 1982) had 4 CPUs

**IBM 3090 [#af48b357]
- consisted of several models, which was configured with 1~6 CPUs

**IBM 4300 [#kdf8feef]
- allowed users to "turn off the processor under program control"

**IBM 9370 [#fc82b680]
-  "small enough and quiet enough to operate in an office environment."
- could be expanded by adding features

----
+[[Google Group - MIPs Ratings:https://groups.google.com/forum/#!topic/bit.listserv.ibm-main/q1LCe0P2RuA]]
+[[Wikipedia: IMB System/370:https://en.wikipedia.org/wiki/IBM_System/370]]
+[[IBM System/370 Model 145:https://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3145.html]]
+[[IBM System 370 Control Panel:http://www.computinghistory.org.uk/det/31058/IBM-System-370-Control-Panel/]]

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