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Z80: Difference between revisions
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Mention the КР1858ВМ3
(U880 cleanup) |
(Mention the КР1858ВМ3) |
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[[NEC]] produced an unlicensed clone of the Z80 ([http://archive.computerhistory.org/resources/access/text/Oral_History/102658073.05.01.acc.pdf Computer History Museum: Z80 oral history] page 13) through reverse engineering. It is this clone, the NEC µPD780 that is found in the majority of Spectrums, labelled as a "D780C -1". | [[NEC]] produced an unlicensed clone of the Z80 ([http://archive.computerhistory.org/resources/access/text/Oral_History/102658073.05.01.acc.pdf Computer History Museum: Z80 oral history] page 13) through reverse engineering. It is this clone, the NEC µPD780 that is found in the majority of Spectrums, labelled as a "D780C -1". | ||
The U880 was an East German clone of the Z80. This was also produced by Angstrem (Ангстрем) as the Т34ВМ1 in Cyrillic (T34VM1 in Latin script), which photomicrographs reveal to use the U880 die mask[http://zeptobars.ru/en/read/t34vm1-z80-angstrem-mme], and the KR1858VM1 in Cyrillic (КР1858ВМ1 in Latin script). These differ from the Zilog Z80 in their setting of the carry flag after an OUTI operation, but are otherwise (almost?) identical. A CMOS clone, the КР1858ВМ3, also existed. | The U880 was an East German clone of the Z80. This was also produced by Angstrem (Ангстрем) as the Т34ВМ1 in Cyrillic (T34VM1 in Latin script), which photomicrographs reveal to use the U880 die mask[http://zeptobars.ru/en/read/t34vm1-z80-angstrem-mme], and the KR1858VM1 in Cyrillic (КР1858ВМ1 in Latin script). These differ from the Zilog Z80 in their setting of the carry flag after an OUTI operation, but are otherwise (almost?) identical. A CMOS clone, the КР1858ВМ3, also existed, and this is known not to increment the R register during a HALT instruction[http://zxpress.ru/article.php?id=2943]. | ||
== Contended memory == | == Contended memory == | ||