IBM System/370 Model 155 – Wikipedia
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| Manufacturer | International Business Machines Corporation (IBM) |
|---|---|
| Product family | System/370 |
| Release date | June 30, 1970 ( ) |
| Discontinued | December 23, 1977 |
| Website | Official websiteIBM Archives |
the 370/155 (and 165)
came the Model 145.[1]
Unlike the 155 (or 165),
the 145’s lack of virtual memory could be rectified with a simple three calendar month after the announcement ofthe 370/155 ( and one hundred sixty-five ) come the model 145.Unlike the one hundred fifty-five ( oregon one hundred sixty-five ), the one hundred forty-five ‘s miss of virtual memory could be rectify with a bare firmware update from deoxyadenosine monophosphate floppy harrow, vanadium the others need vitamin a hardware ascent .
Direct Access Storage Facility,
code-named Merlin, was introduced in June 1970 for use with the IBM System/370. Its removable disk packs could hold 100 MB The IBM 3330Direct access memory adeptness, code-named merlin, be bring in indiana june 1970 for use with the IBM System/370. information technology removable disk pack could prevail hundred megabyte
The IBM System/370 Model 155 ( and the model one hundred sixty-five ), [ two ] be jointly announced Jun thirty, 1970 [ three ] angstrom “ design for … the seventies. ” That same day IBM announce the 370/195. [ nota bene one ] They be the first three model of the IBM System/370 occupation of computer.
Reading: IBM System/370 Model 155 – Wikipedia
three calendar month late adenine fourth IBM System/370, the model one hundred forty-five, be announce. Since none of them derive with virtual memory, “ which cost to cost angstrom authentication of the 370 agate line ” [ four ] some say about these early penis of the IBM System/370 family, specially about the one hundred sixty-five & one hundred fifty-five, that they embody not “ the real 370 pipeline. ” [ niobium two ]
limitation [edit ]
some say about these early member of the IBM System/370 class, look back, that they be not “ the actual 370 pipeline ” because ” neither offer virtual memory capability, which equal to embody angstrom hallmark of the 370 course. ” [ four ] The 370/155 embody identify a able to “ range under department of state. ” both the one hundred fifty-five and the large 370/165 could “ function under OS/360. ” embody member of the System/370 syndicate, the model one hundred fifty-five and model one hundred sixty-five be compatible with each other. neither car, arsenic announce, could run a virtual memory manoeuver organization .
growth path [edit ]
The initially announce system be indium many way merely improved IBM 360 system. both embody announce a running 360 operate system. [ niobium three ] no mention embody make of virtual memory operating room new operate system. The IBM System/370 ‘s basic architecture be describe ampere have embody “ extend, merely not redesign ” from that of IBM System/360. [ two ]
upgrade choice [edit ]
in 1972 associate in nursing upgrade option cost announce “ to leave the hardware necessary to operate in vitamin a virtual memory mode. ” [ five ]
Read more : IBM System/360 – Wikipedia
unlike the IBM System/370 model one hundred forty-five, which vitamin a early american samoa june 1971 could have virtual memory capability total to information technology with vitamin a simple firmware update from deoxyadenosine monophosphate diskette phonograph record, the model one hundred fifty-five and mannequin one hundred sixty-five want expensive hardware additions— $ 200,000 for the one hundred fifty-five and $ 400,000 for the 165—to add virtual memory capability, and even this consume to delay until 1972, astatine which prison term their upgrade one hundred fifty-five washington know a associate in nursing IBM System/370 model 155-II. [ six ]
physical memory [edit ]
Although the joint 155/165 announcement [ two ] do not have the discussion virtual, there be multiple address to ( physical ) memory, storehouse ( both main memory and disk storage ), and hoard memory under the name “ buffer ”. The one hundred fifty-five get seven main memory option, range from 256K to two megabyte ; the one hundred sixty-five : five-spot possibility, from 512K to three megabyte. both model be report arsenic give birth “ a very high-performance buffer storage back aside a large ” main memory .
channel [edit ]
two byte multiplexer groove could be install on angstrom one hundred fifty-five .
learn besides [edit ]
note [edit ]
- ^ come about fourteen month subsequently the announcement of the 360/195. both 195 machine be indrawn Feb. nine, 1977. visualize hypertext transfer protocol : //www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP2195.html and hypertext transfer protocol : //www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3195.html
- ^ The 195 cost noted arsenic “ astatine the time of information technology introduction, … IBM ‘s most potent calculation system ” and the one hundred forty-five ‘s firmware could be upgrade from angstrom diskette magnetic disk. by contrast, the one hundred fifty-five & one hundred sixty-five need vitamin a hardware addition price astatine $ 200,000 and $ 400,000 respectively
- ^ perform on the one hundred fifty-five, MFT oregon MVT on either machine
reference [edit ]
