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<ref name="Elliott_2012_HGCPlus">{{cite web |title=Hercules Graphics Card Plus: Notes |author-first=John |author-last=Elliott |date=2012-08-09 |url=http://www.seasip.info/VintagePC/hercplus.html |access-date=2016-11-23 |dead-url=no |archive-url=https://web.archive.org/web/20161123124757/http://www.seasip.info/VintagePC/hercplus.html |archive-date=2016-11-23}}</ref>
<ref name="Elliott_2012_InColor">{{cite web |title=Hercules InColor Card: Notes |author-first=John |author-last=Elliott |date=2012-08-05 |url=http://www.seasip.info/VintagePC/incolor.html |access-date=2016-11-23 |dead-url=no |archive-url=https://web.archive.org/web/20161123123816/http://www.seasip.info/VintagePC/incolor.html |archive-date=2016-11-23}}</ref>
<ref name="Elliott_2005_MDA">{{cite web |title=Monochrome Display Adapter: Notes |author-first=John |author-last=Elliott |date=2005-11-06 |url=http://www.seasip.info/VintagePC/mda.html |access-date=2016-11-23 |dead-url=no |archive-url=https://web.archive.org/web/20161123133459/http://www.seasip.info/VintagePC/mda.html |archive-date=2016-11-23 |quote=[…] Reading from port 03BAh returns vertical sync in bit 7, and a card ID in bits 6-4: 000: Hercules, 001: Hercules Plus, 101: Hercules InColor, 111: Unknown clone […] One card […] which appears to be a Hercules clone of Eastern European origin, has a further capability - two ROM fonts, selectable in software. These options are controlled in a similar manner to other extended features in the Hercules: Bit 2 of port 3BFh must be set to enable the feature, and then Bit 4 of port 3B8h selects which font to use. The card ID in bits 6-4 of port 03BAh has all three bits set. […]}}</ref>
<ref name="Ferraro_1994">{{cite book |title=Programmer's Guide to the EGA, VGA and Super VGA Cards |author-first=Richard F. |author-last=Ferraro |edition=3rd |date=August 1994 |publisher=[[Addison-Wesley Publishing Company, Inc.]] |isbn=0-201-62490-7 |id={{EAN|9780201624908}}}}</ref>
<ref name="Paul_2001_COUNTRY">{{cite web |title=DOS COUNTRY.SYS file format |type=COUNTRY.LST file |author-first=Matthias |author-last=Paul |date=2001-06-10 |edition=1.44 |orig-year=1995 |url=http://www.columbia.edu/~em36/wpdos/MatthiasPaulCPI.zip<!-- not an official distribution archive, but contains an older version of COUNTRY.LST --> |access-date=2016-08-20 |dead-url=no |archive-url=https://web.archive.org/web/20160420065252/http://www.columbia.edu/~em36/wpdos/MatthiasPaulCPI.zip |archive-date=2016-04-20}}</ref>
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<ref name="Hart_1985">{{cite journal |author-first1=Glenn A. |author-last1=Hart |author-first2=Jim |author-last2=Forney ||title=Video Board Reviews: Persyst BoB Color Adapter |journal=[[PC Magazine]] |date=1985-02-19 |pages=121-133 |url=https://books.google.de/books?id=Q2ad61ZUYQMC&pg=PA132}}</ref>
<ref name="Derfler_1985">{{cite journal |author-first=Frank J. |author-last=Derfler, Jr. |title=Expansion Options: Persyst Color Combo: Fit for an XT |journal=[[PC Magazine]] |date=1985-10-29 |url=https://books.google.de/books?id=jBnPebByBGkC&pg=PA195 |access-date=2016-11-23 |pages=196-199}}</ref>
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