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IBM System/370 Model 155: Difference between revisions

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→Physical memory: editorial changes
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Although the joint 155/165 announcement<ref name=IBMarc.165/> did not have the word virtual, there were multiple references to (physical) memory, storage (both main memory and disk storage), and [[cache memory]] under the name "buffer".
 
The 155 had seven main memory choices, ranging from 256K256&nbsp;KB to 2 &nbsp;MB; the 165: five possibilities, from 512K512&nbsp;KB to 3 &nbsp;MB. Both models were described as having "a very high-performance buffer storage backed by a large" main memory.
 
Another signs of not being "the real 370 line" is that the main storage in 3155 was not monolithic, it was using the older type of ironferrite [[core storage]]. The 3360 storage unit could have 256 or 512 &nbsp;KB of storage, each 3155 could have one to four 3360 units attached. Also, the microcode in 3155 was "hardwired" while later 370 systems loaded the microcode from a [[floppy disk]], enabling easy upgrades. The 3155 also had very limited error logging capability and used aan type[[IBM writer3215]] typewriter console (3215).
 
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