🇧🇾 ЕС1841.A002 Мышь (ES1841.A002 Mouse): Part 1 (First Look) [TCE #0537]
29Let's have a look at another Soviet-era computer mouse, the ЕС1841.А002 Манипулятор Графической Информации (ES1841.A002 Graphical Information Manipulator). It was also apparently called the колобок (little round bun, as it's a ball mouse) or крысой (rat, as it's small).
From ChatGPT:
The Russian word колобок (kolobok) translates to "little round bun" or simply "bun" in English. It refers to a small, round, bread-like pastry often associated with Russian folklore, especially the popular children's tale "Kolobok," where the bun comes to life and goes on an adventure (similar to the "Little Gingerbread Man").
My information source (Russian):
https://habr.com/ru/companies/dataart/articles/449460/
00:00 ... Start
04:10 ... Disassembly
11:15 ... Pinout details
14:20 ... Pinout diagrams (also on my Patreon)
15:00 ... Channel thanks/outro
They were apparently produced in Minsk in the Byelorussian SSR from 1987 and bundled with the ЕС1841 & ЕС1842 computer systems. From their specs., the ЕС1841 is similar to an IBM PC/XT and the ЕС1842 is an almost-IBM PC/AT (without the 80286). But they're not what this video is about so let's not worry about them further.
I got these mice from Alex @ChernobylFamily ... they have an excellent series of videos on the ЕС1841/1842 machines, such as:
• Extreme Restoration of a Soviet ES184...
I have two examples, both from 1991, with DE9 plugs. It utilises a single chip, the Soviet К561ЛТ1А (similar to Western CD4093), which has four Schmitt triggers with 2-input NAND gates. The inputs are tied together resulting in an inverted output (low input → high output), with two outputs accounting for X-plane movement and two accounting for Y-plane movement. This is no doubt standard for a mouse ... first time I've pulled one apart and studied in detail.
The three buttons press down on tactile switches, which don't feel very tactile ... not a very satisfying button press.
The pinout of the DE9 plug is:
Pin 1: Ground
Pin 2: Left Button
Pin 3: Centre Button
Pin 4: Right Button
Pin 5: Y- (К561ЛТ1А pin 11)
Pin 6: Vcc
Pin 7: X+ (К561ЛТ1А pin 4)
Pin 8: X- (К561ЛТ1А pin 3)
Pin 9: Y+ (К561ЛТ1А pin 10)
Note that I've labelled X/Y directions simply based on which side the light sensor is ... the X+ sensor is on the right, the X- is on the left, similarly the Y+ is on the top and Y- is on the bottom. They could very well be labelled around the wrong way ... my labelled X+ sensor actually measures leftward movement, and X- measures rightward movement. I'm not terribly fussed for this video ... maybe in a Part 2 if I can get it working with a Western machine ...
Patreon post:
https://www.patreon.com/posts/es1841-a002-114726760?utm_medium=clipboard_copy
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https://karlcasey.bandcamp.com/
/ @whitebataudio