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IBM System/370 Model 148: Difference between revisions

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A "virtualized" Model 145 is a Model 145 with the microcode update that makes it use the TLB hardware to do DAT rather than just to do some weird stuff in the "run DOS jobs under OS" software, and "virtualizing" the Model 135 was also just a microcode update. Presumably, the "-3" refers to the -3 versions of the CPU. Update to reflect that.
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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''
| image_size = 270px
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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>
 
Not only were they both more powerful and better in price/performance than the IBM System/370 Model 145 with a 3145-3 CPU and the IBM System/370 Model 135 with a 3135-3 CPU, respecitflyrespectively, 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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