Sergei Frolov

813 posts

Sergei Frolov

Sergei Frolov

@sfrolov

Soviet calculators and computers collector. Welcome to my website at https://t.co/u7IqEiavq1

St. Petersburg, Russia Katılım Haziran 2009
114 Takip Edilen756 Takipçiler
Sergei Frolov
Sergei Frolov@sfrolov·
Casio CQ-1 and CQ-2. 1977th. Same functions, CQ-2 has bigger display.
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Travis Goodspeed
Travis Goodspeed@travisgoodspeed·
MK51, a single-chip RPN calculator from Электроника. The program ROM is on the right side, but bits are not surface visible. Maybe I can reveal them with delayering or a Dash etch.
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Sergei Frolov
Sergei Frolov@sfrolov·
Merry Christmas and happy New year!
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Sergei Frolov
Sergei Frolov@sfrolov·
Casio TC-10 Japanese domestic. Calculator, clock with day of week, phone book, currency converter and travel expense account
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Sergei Frolov retweetledi
Lepanto Institute
Lepanto Institute@LepantoInst·
Some people are questioning the veracity of the claims that a statue of St. Peter in Argentina was struck by lightning on Dec. 17, pulverizing the halo, key, and blessing hand. The Lepanto Institute sent someone to the location to take pictures and confirm the events. The Dec. 17 lightning strike is CONFIRMED and here are additional pictures of the statue. NOTE: the lightning struck the statue, despite there being lightning rods some 30-40 feet above it (second and third picture).
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Sergei Frolov
Sergei Frolov@sfrolov·
@System11b That's a great solution. I use the same purchased factory boards (to repair oscilloscopes and similar).
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System11
System11@System11b·
The PCB extender board I made for Iskra 12x calculators works fine, now I can actually try to diagnose this one, the card shown is faulty, press any numbers and the entire machine crashes. Link to PCB files and part number will go on my blog. @sfrolov is this of any use to you?
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Ken Shirriff
Ken Shirriff@kenshirriff·
Can anyone help me identify this symbol on a vintage IC? I suspect it is a Soviet manufacturer logo but I looked at bunch of logos (madelectronics.ru/book/prominfo/…) and didn't find it.
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Sergei Frolov
Sergei Frolov@sfrolov·
Many simple calculators have a function to calculate the inverse of a number (1/X). To calculate this function, press "divide" and "equals". youtube.com/watch?v=BB2wmF…
YouTube video
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Sergei Frolov
Sergei Frolov@sfrolov·
@nanzonet I agree that -CW models have become much less convenient than -MS, -ES and -EX. You have to press a lot of buttons before you realise which menu a familiar function has been moved to. Simply storing a number in memory has become a separate quest.
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Sergei Frolov
Sergei Frolov@sfrolov·
@travisgoodspeed Some year ago I createrd this table. Blue - own development, yellow - partial, red - full copy, pink - calculators plant purchased (from GI)
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Travis Goodspeed
Travis Goodspeed@travisgoodspeed·
@sfrolov Is there a list somewhere matching Elektronika designs to their Western equivalents? I'd like to match up some more die photographs of clones.
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Sergei Frolov
Sergei Frolov@sfrolov·
Many hours of operation without turning off
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