IBM System/370 Model 155

IBM System/370 Model 155
3 months after the announcement of the 370/155 (and 165) came the Model 145. Unlike the 155 (or 165), the 145's lack of virtual memory could be rectified with a simple microcode update from a floppy disk, vs the others needing a hardware upgrade.
The IBM 3330 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 System/370 Model 155 (and the Model 165),

- IBM System/370 Model 155

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IBM System/370 Model 165

IBM System/370 Model 165
3 months after the announcement of the 370/165 (and 155) came the Model 145. Unlike the 165 (or 155), the 145's lack of virtual memory could be rectified with a simple microcode update from a floppy disk, vs the others needing a hardware upgrade.
The IBM 3330 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 System/370 Model 165 (and the Model 155 )

IBM System/370

Model range of IBM mainframe computers announced on June 30, 1970 as the successors to the System/360 family.

System/370-145 3D Rendering
3D Rendering of computer center with IBM System/370-145 and IBM 2401 tape drives
System/370-145 3D Rendering
System/370-145 system console.

The first System/370 machines, the Model 155 and the Model 165, incorporated only a small number of changes to the System/360 architecture.

IBM System/370 Model 145

IBM System/370 Model 145
IBM System/370 Model 145
Render of S/370 Model 145 with typical peripherals
IBM System/370 Model 145 system console
IBM monolithic memory card

The IBM System/370 Model 145 was announced September 23, 1970, three months after the 155 and 165 models.

IBM System/370 Model 135

Announced March 8, 1971,

IBM System/370 Model 135
IBM 3330 "Expanded channel capacity and the ability to use the high-performance IBM 3330 disk storage under either Operating System (OS)or Disk Operating System (DOS) were ... among the factors significant to the '''Model 135's ...capabilities."

Unlike the 155 & 165, which required an expensive

Read-only memory

Type of non-volatile memory used in computers and other electronic devices.

Many game consoles use interchangeable ROM cartridges, allowing for one system to play multiple games. Shown here is the inside of a Pokémon Silver Game Boy cartridge. The ROM is the IC on the right labeled "MX23C1603-12A".
The first EPROM, an Intel 1702, with the die and wire bonds clearly visible through the erase window.
Transformer matrix ROM (TROS), from the IBM System 360/20
An EPROM

IBM used capacitor read-only storage (CROS) and transformer read-only storage (TROS) to store microcode for the smaller System/360 models, the 360/85, and the initial two System/370 models (370/155 and 370/165).

List of IBM products

Partial list of products, services, and subsidiaries of International Business Machines Corporation and its predecessor corporations, beginning in the 1890s.

IBM 526 Printing Summary Punch, ca. 1948, with French keyboard layout
IBM 601
Front cover of a sales catalog from January 1920. The cover also shows scales and a portable keypunch(2nd from bottom lower left)
A 40-foot Portable Modular Data Center.

IBM 3155: System/370 Model 155 Central Processing Unit; mid range; without virtual memory [DAT] unless upgraded to 155-II

LexisNexis

Corporation that sells data analytics products and various databases that are accessed through online portals, including portals for computer-assisted legal research , newspaper search, and consumer information.

LexisNexis office in Markham, a suburb of Toronto, Ontario, Canada
The old LexisNexis logo

By 1974, LEXIS was running on an IBM 370/155 computer in Ohio supported by a set of IBM 3330 disk storage units which could store up to about 4 billion characters.