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CPUShack
Joined: 16 Jun 2003
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frag_
Joined: 17 Nov 2008
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Location: Estonia
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 Posted: Wed Jan 27, 2021 7:02 am Post subject: |
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| The big quiestion of Otrokhov's version is: if they circumvented all Shima's traps and made exact clone then why their T34VM1/1858VM1 have (afaik) exactly the same differences with original z80 as MME U880 (which was made by entirely different team much earlier). |
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max1024
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| Posted: Wed Jan 27, 2021 11:16 am Post subject: |
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Nice and interesting story  Z80 is LegendaRy CPU )) |
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debs3759
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| Posted: Wed Jan 27, 2021 11:43 am Post subject: |
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Interesting article
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CPUShack
Joined: 16 Jun 2003
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| Posted: Wed Jan 27, 2021 12:44 pm Post subject: |
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| frag_ wrote: | | The big quiestion of Otrokhov's version is: if they circumvented all Shima's traps and made exact clone then why their T34VM1/1858VM1 have (afaik) exactly the same differences with original z80 as MME U880 (which was made by entirely different team much earlier). |
It apparently has some differences from the U880 as well, in how MEMPTR works
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Vladyak2000
Joined: 28 Jul 2020
Posts: 401
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| Posted: Thu Jan 28, 2021 1:59 am Post subject: |
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| CPUShack wrote: | | frag_ wrote: | | The big quiestion of Otrokhov's version is: if they circumvented all Shima's traps and made exact clone then why their T34VM1/1858VM1 have (afaik) exactly the same differences with original z80 as MME U880 (which was made by entirely different team much earlier). |
It apparently has some differences from the U880 as well, in how MEMPTR works |
https://gist.github.com/drhelius/8497817 |
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cvandijk
Joined: 21 Jul 2016
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Location: Netherlands
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| Posted: Thu Jan 28, 2021 2:14 am Post subject: |
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| Maybe the UCA can test those differences? |
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Twinrocket
Joined: 04 Apr 2012
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| Posted: Sat Jan 30, 2021 7:49 am Post subject: |
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Cool article  |
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Twinrocket
Joined: 04 Apr 2012
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| Posted: Sun Jan 31, 2021 7:03 am Post subject: |
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| max1024 wrote: | | Nice and interesting story Z80 is LegendaRy CPU )) |
The Z80 is the most sucessful CPU ever made IMHO |
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CPUShack
Joined: 16 Jun 2003
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| Posted: Sun Jan 31, 2021 12:52 pm Post subject: |
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| Twinrocket wrote: | | max1024 wrote: | | Nice and interesting story Z80 is LegendaRy CPU )) |
The Z80 is the most sucessful CPU ever made IMHO |
It and the 6502 probably
Both still widely used, and 6502 still widely made
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Vladyak2000
Joined: 28 Jul 2020
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| Posted: Sat Feb 06, 2021 12:20 pm Post subject: |
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I became the owner of the Soviet Z80 clone with the most unusual and ambiguous markings. KM1582BM2-100.
It’s the only chip marked 1582. All other chips in this series are ULA. This is probably the reason for this version.
It is described on the website www.155la3.ru.
"Micron" from Zelenograd received an order to manufacture a set of chips for the Sinclair computer. The original Sinclair features two large chips, the Z80 and ULA. The Z80 was also manufactured as ULA. ULA - 1582BM1-хххх, Z80 - 1582BM2-0100. "0100" is a firmware number.
To prove or disprove this version, I wrote an email to Michael from Zeptobars and offered him one of the chips.
Also I hope John doesn’t refuse to help.
To be continued... |
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