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A [[serial computer]] processes data a single bit at a time. For example, the [[PDP-8|PDP-8/S]] was a [[12-bit]] computer using a 1-bit ALU, processing the 12 bits serially.<ref name="uxuXH">{{cite book|url=http://www.bitsavers.org/pdf/dec/pdp8/pdp8s/PDP8S_MaintMan.pdf|title=PDP-8/S Maintenance Manual|date=August 1969|publisher=[[Digital Equipment Corporation]]|page=3{{ndash}}14}}</ref>
An example of a 1-bit computer built from discrete logic [[small-scale integration|SSI]] chips is the [[Wang 500]]<!-- Wang 500-0, Wang 520 --> (1970/1971) calculator<ref name="Koblentz_2004">{{cite interview |title=LED calculators rule her house |interviewer-first=Evan |interviewer-last=Koblentz |author-first=Katie<!-- aka Kathie / Katherine / Ken --> |author-last=Wasserman |author-link=Ken Wasserman |journal=Computer Collector Newsletter / Technology Rewind |orig-year=January 2004 |date=March 2006 |url=http://www.snarc.net/tr/katie-led.htm |access-date=2017-05-20 |url-status=live |archive-url=https://archive.today/20191227180243/http://www.snarc.net/tr/katie-led.htm |archive-date=2019-12-27 |quote=Probably my most favorite is the Wang 500. It's got several unique things about it: a very unusual ROM memory made of hundreds of long enamel-coated wires wrapped around iron cores; a super-fast single-bit CPU built out of SSI logic chips; and of course tons of really cool-looking colorful keys.}}</ref><ref name="Wang_1974_Schematics">{{cite book |title=Product Service - Schematic manual |publisher=[[Wang Laboratories, Inc.]] |date=1974 |id=03-0019-0 |url=http://www.thebattles.net/oddments/wang/Wang_500_schematics.pdf |access-date=2017-05-20 |url-status=live |archive-url=https://web.archive.org/web/20170520161939/http://www.thebattles.net/oddments/wang/Wang_500_schematics.pdf |archive-date=2017-05-20}}</ref> as well as the [[Wang 1200]]<!-- including Wang 1220 and 1222. The 1222, however, also had an Intel 4004 --> (1971/1972)<ref name="Battle_2010">{{cite web |title=Wang 1200 - Wang WP History |author-first=Jim |author-last=Battle |date=2010-03-07 |url=http://www.wang1200.org/history.html |access-date=2017-05-21 |url-status=live |archive-url=https://web.archive.org/web/20170521004512/http://www.wang1200.org/history.html |archive-date=2017-05-21}}</ref> word processor series
An example of a 1-bit architecture that was marketed as a CPU is the [[Motorola MC14500B]] Industrial Control Unit (ICU),<ref name="Motorola_1977_MC14500B">{{cite book |title=Motorola MC14500B Industrial Control Unit Handbook - Theory and Operation of a CMOS one-bit processor compatible with B series CMOS devices |author-first1=Vern |author-last1=Gregory |author-first2=Brian |author-last2=Dellande |author-first3=Ray |author-last3=DiSilvestro |author-first4=Terry |author-last4=Malarkey |author-first5=Phil |author-last5=Smith |author-first6=Mike |author-last6=Hadley |publisher=[[Motorola Semiconductor Products Inc.]] |date=1977 |id=33-B78/8.0 |url=http://tinymicros.com/mediawiki/images/e/ec/MC14500B_Handbook.pdf |access-date=2017-05-20 |url-status=live}} (NB. Also available in German language under the title "Motorola MC14500B Industrial Control Unit Handbuch - Theorie und Anwendung eines Ein-Bit-CMOS-Prozessors".)</ref><ref name="Motorola_1995_MC14500B">{{cite book |title=Industrial Control Unit MC14500B |series=Semiconductor Technical Data |work=Motorola CMOS Logic Data |publisher=[[Motorola]] |edition=revision 3 |date=1995<!-- |orig-year=1/94? --> |pages=306–313 |url=http://www.brouhaha.com/~eric/retrocomputing/motorola/mc14500b/mc14500brev3.pdf |access-date=2012-08-01 |url-status=live |archive-url=https://web.archive.org/web/20170520123638/http://www.brouhaha.com/~eric/retrocomputing/motorola/mc14500b/mc14500brev3.pdf |archive-date=2017-05-20}}</ref> introduced in 1977 and manufactured at least up into the mid 1990s.<ref name="Motorola_1995_MC14500B" /> Its manual states:
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