IBM System/370 Model 148: Difference between revisions

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| successor =

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

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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

|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

|url-status=dead

|archive-date=March 11, 2005

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

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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 microcode-based feature that alloweallowed for faster execution than a software-only approach.</ref>

* ''[[Extended Control Program Support]]'' - 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>