Editing GE-200 series (section)

== 200 series models ==
The main machine in the line was the '''GE-225''' (1961).<ref>{{Cite book|url=https://books.google.com/books?id=nFCJgwaMSeMC&q=%22GE-225%22%201961&pg=PA26|title=Auditing with the Computer|last=Boutell|first=Wayne S.|date=1965|publisher=University of California Press|pages=26|language=en |via=Google Books}}</ref><ref name=":0" /> It used a 20-bit [[Word (computer architecture)|word]], of which 13 [[bit]]s could be used for an [[address space|address]]. Along with the basic [[central processing unit]] (CPU) the system could also have had a [[floating-point unit]] (the "Auxiliary Arithmetic Unit"), or a [[fixed-point arithmetic|fixed-point]] decimal option with three six-bit decimal digits per word. It had eleven [[input/output|I/O]] [[channel controller]]s, and GE sold a variety of add-ons including disks, printers, and other devices. The machines were built using discrete transistors, with a typical machine containing about 10,000 transistors and 20,000 diodes. They used [[magnetic-core memory]], and a standard 8&nbsp;[[wikt:kiloword|kiloword]] system held 186,000 magnetic cores. They weighed about {{convert|2000|lb|ST kg}}.<ref>{{Cite web|url=http://www.ed-thelen.org/comp-hist/BRL64-g.html#GE-225|title=GE 225|last=Weik|first=Martin H.|date=Jan 1964|website=ed-thelen.org|series=A Fourth Survey of Domestic Electronic Digital Computing Systems|quote=Central Processor and Control Console (with 4K or 8K memory, typewriter, and card reader)}}</ref><ref>{{cite web |title=GE-2xx documents |url=http://www.bitsavers.org/pdf/ge/GE-2xx/ |website=www.bitsavers.org|at=[http://www.bitsavers.org/pdf/ge/GE-2xx/CPB-267_GE-235-SystemManual_1963.pdf CPB-267_GE-235-SystemManual_1963.pdf], p. 1 (95)}}</ref>

The '''GE-215''' (1963)<ref name=":0" /><ref>{{cite journal|title=Across the editor's desk: COMPUTING AND DATA PROCESSING NEWSLETTER - NEW PRODUCTS - Digital - SECOND IN FAMILY OF GENERAL ELECTRIC COMPUTER|journal=Computers and Automation|date=Mar 1963|volume=XII|issue=3|page=42|url=http://www.bitsavers.org/magazines/Computers_And_Automation/196303.pdf |archive-url=https://ghostarchive.org/archive/20221009/http://www.bitsavers.org/magazines/Computers_And_Automation/196303.pdf |archive-date=2022-10-09 |url-status=live|access-date=2020-09-05}}</ref> was a scaled-down version of the GE-225, including only six I/O channels and only 4 kilowords or 8 kilowords of core.

The '''GE-205''' (1964).<ref name=":1" />

The '''GE-235''' (1964)<ref name=":0" /> was a re-implementation of the GE-225 with three times faster memory than the original.<ref>{{cite book |title=GE-235 Central Processor Reference Manual |date=March 1964 |publisher=General Electric |id=CPB-374 }}</ref> The GE-235 consisted of several major components and options:
* Central processor
* 400 card-per-minute (CPM) or 1000 CPM [[punched card reader|card reader]]
* 100 CPM card punch or 300 CPM card punch
* [[Perforated paper tape|Perforated tape]] subsystem
* [[Magnetic tape]] subsystem
* 12-pocket high-speed document handler
* On-line high-speed printer or off/on-line speed printer
* Disc storage unit
* Auxiliary [[Arithmetic Logic Unit]] (ALU)
* [[DATANET-30|DATANET]] data communications equipment