IBM System/370 Model 148: Difference between revisions

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{{Infobox information appliance

| name = IBM System/370 Model 148

| title =
| aka =

| logo = File:IBM logo.svg

| aka =

| image = IBM System370 model 148 (I197911).jpg

| logo = File:IBM logo.svg

| caption = IBM System/370 Model 148

| image =

| developer =

| caption = IBM System/370 Model 148

| developer =

| manufacturer = International Business Machines Corporation ([[IBM]])

| family = [[System/370]]

| generation =

| releasedate = {{Start date|1976|06|30}}

| lifespan =

| price =

| discontinued = November 1, 1983

| unitssold =

| unitsshipped =

| media =
| os =

| os power =

| power soc =

| soc cpu =

| memory = One or two megabytes of high-density integrated monolithic processor storage

| cpu =

| storage =

| memory = One or two megabytes of high-density integrated monolithic processor storage

| storage memory card =

| memory card display =

| display graphics =

| graphics sound =

| sound input =

| input controllers =

| controllers camera =

| camera touchpad =

| touchpad =

| connectivity =

| platform =

| service =

| dimensions =

| weight =

| topgame =

| compatibility =

| predecessor =

| successor =

| related =

| image_size = 270px

| website = {{Official website|https://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3168.html}} ''IBM Archives''}}

}}

The '''IBM System/370 Model 148''' (and the '''Model 138'''<ref name=IBMarc.138>{{cite web

|url=https://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3138.html

|archive-url=https://web.archive.org/web/20050311002150/http://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3138.html

|title=System/370 Model 138|website=IBM Archives|publisher=IBM}}</ref>) were both announced June 30, 1976<ref name=IBMarc.148>{{cite web

|url-status=dead

|archive-date=March 11, 2005

|title=System/370 Model 138|website=IBM Archives|date=23 January 2003|publisher=IBM}}</ref>) were both announced June 30, 1976<ref name=IBMarc.148>{{cite web

|url=https://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3148.html

|archive-url=https://web.archive.org/web/20050311002817/http://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3148.html

|title=System/370 Model 148|website=IBM Archives|publisher=IBM}}</ref>

|url-status=dead

|archive-date=March 11, 2005

|title=System/370 Model 148|website=IBM Archives|date=23 January 2003|publisher=IBM}}</ref>

Not only were they both more powerful and better in price/performance than theirthe virtualized<ref>135-3,IBM System/370 Model 145 with a 3145-3< CPU and the IBM System/ref>370 counterparts,Model but135 actuallywith mucha 3135-3 CPU, respectively, but lower in price.<ref name=CW.jump/><ref>$350,000 for a 138 having 500K of memory, vs. $721,500 for a 135-3 with 500K - less than half the price!</ref>

The 148 and 138,<ref>described as "mediumpoweredmedium-powered System/370 computers" {{cite news

|newspaper=[[The New York Times]]

|url=https://www.nytimes.com/1978/03/02/archives/ibm-cutting-prices-20-on-2-computers.html

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==Expanded capabilities==

The 148 had four times the ''reloadable [[Control store|control storage]]'' of the 145,<ref>128K vs. 32K</ref> enabling or enhancing features such as:

* ''[[APL (programming language)|APL]] Assist''<ref>a Microcodemicrocode-based feature that alloweallowed for faster execution than a software-only approach.</ref>

* ''[[Extended controlControl programProgram supportSupport]]'' - going beyond the language-specific APL Assist, this had wider scope, reducing CPU cycles needed to run the operating system.<ref>up to 20% for OS/VS1, up to 55% for VM/CMS.</ref>

The 3148 (and the 3138) had a built in service processor, aka known as an IOC, this service processor could directly attach a 3203 printer. The IOC also drives an [[IBM 3277]] display console, whereas the older 3145 used an [[IBM 3215]] typewriter console.

A new model of the IBM 3203 printer family, the Model 4, was announced. Rated at 1200 Lines/Minutes, it was intended to provide already-available 1200 LPM printing, but in a more compact form.

A new model of the IBM 3203 printer family, the Model 4, was announced. Rated at 1200 Lineslines/Minutesminute (LPM), it was intended to provide already-available 1200 LPM printing, but in a more compact form.

==Field upgrades==

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https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/477654?Firmware-upgrade-in-the-filed-TMS320F2837xS-Delfino-Microcontrollers</ref>

IBM could upgrade a 370/145 that had been field-upgraded to a 145-2, resulting in a 145-3. This was a major accomplishment, compared to what is known as a "forklift upgrade" - out with the old, in with the new, often consuming valuable time.<ref>{{cite web |url=https://www.computerworld.com/article/3058252/data-storage/how-to-overcome-the-infamous-forklift-upgrade-challenge.html |title=How to overcome the infamous forklift upgrade challenge {{!}} Computerworld |website=www.computerworld.com |url-status=dead |archive-url=https://web.archive.org/web/20160419032058/http://www.computerworld.com/article/3058252/data-storage/how-to-overcome-the-infamous-forklift-upgrade-challenge.html |archive-date=2016-04-19}} </ref>

<ref>{{Cite web|url=https://www.pcmag.com/encyclopedia/term/68928/forklift-upgrade|title = Definition of forklift upgrade}}</ref>

==Marketing considerations==