![π―π΅ National γγ·γ§γγ« JR-200: Part 1 (First Look) [#TCE0695] @Brfff](https://i.ytimg.com/vi/wLMDZcOQIaI/maxresdefault.jpg)
Uploaded June 2026 | Updated September 2026, 3 weeks ago
Ad-free version on my Patreon ... patreon.com/TheCluelessEngineer
Let's have a look at this MC6802-based computer, released in 1982, from Matsushita in Japan. Unfortunately it seems to be faulty so we'll work on that in Part 2 after giving it a bit of a clean.
It was also sold as the Panasonic JR-200U (North America) and the JR-200UP (PAL) in Europe. It succeeded the JR-100 and preceded the JR-300.
This machine is from Japan so requires 100VAC (we're 240VAC here in Australia) so will need a step-down transformer. But it might be possible to convert by swapping the transformer (100-to-21V).
Its main chips are:
- MN1800A CPU (an MC6802 minus the clock generator & with the internal RAM disabled ... so, like an MC6800?)
- HD61K201F CRT (plus other things) controller
- MN1271 I/O interface (equivalent to two 6522 VIAs?)
- MN1544CJR 4-bit microprocessor for the keyboard & joystick I/O
Ignoring the CPU, it's a bit of an odd machine ... it has 32KBytes of RAM implemented as four 4864 64Kbit DRAMs ... 4-bit RAM? There is 4KByte of video RAM (two 6116 SRAM) which would be faster as it's 8-bit ... ?
It has a screen resolution of 256x192 pixels and a text screen size of 32x24 in eight colours.
It has a good array of ports:
- two MSX-compatible joystick ports
- RCA jack for 8Ξ© speaker (there is also an internal speaker)
- 8-pin DIN for cassette (seems a little excessive)
- 8-pin DIN for RGB and composite video
- Printer port
- System bus expansion port
- Space for an RS232 port
The composite video output can be switched between colour (γ«γ©γΌ) and monochrome/B&W (γ’γγ―γ) and the cassette can be switched between 600 & 2400 Baud.
Some good information here:
kameli.net/marq/?page_id=1270
github.com/ypsitau/jr200
github.com/0cjs/sedoc/tree/main/8bit/jr-200
00:00 ... Intro
01:45 ... External ports
04:50 ... Testing composite video output (NOK)
06:50 ... Opening the case
09:00 ... Keyboard
10:35 ... Motherboard
13:15 ... Closer look
15:30 ... Channel thanks & outro
--------------------------------
Check out my Patreon for regular blog-type updates between videos - there is a free membership tier and two paid tiers (US$2 and US$5). There is also a one-week trial for the paid tiers so if you don't think it's worth it, then cancel ... no hard feelings ... I appreciate any support, even if it's just subscribing to my YouTube channel!
patreon.com/TheCluelessEngineer
--------------------------------
Outro music: "Lexicon" (White Bat 40) by Karl Casey @ White Bat Audio
karlcasey.bandcamp.com
youtube.com/@WhiteBatAudio
Ad-free version on my Patreon ... patreon.com/TheCluelessEngineer
Let's have a look at this MC6802-based computer, released in 1982, from Matsushita in Japan. Unfortunately it seems to be faulty so we'll work on that in Part 2 after giving it a bit of a clean.
It was also sold as the Panasonic JR-200U (North America) and the JR-200UP (PAL) in Europe. It succeeded the JR-100 and preceded the JR-300.
This machine is from Japan so requires 100VAC (we're 240VAC here in Australia) so will need a step-down transformer. But it might be possible to convert by swapping the transformer (100-to-21V).
Its main chips are:
- MN1800A CPU (an MC6802 minus the clock generator & with the internal RAM disabled ... so, like an MC6800?)
- HD61K201F CRT (plus other things) controller
- MN1271 I/O interface (equivalent to two 6522 VIAs?)
- MN1544CJR 4-bit microprocessor for the keyboard & joystick I/O
Ignoring the CPU, it's a bit of an odd machine ... it has 32KBytes of RAM implemented as four 4864 64Kbit DRAMs ... 4-bit RAM? There is 4KByte of video RAM (two 6116 SRAM) which would be faster as it's 8-bit ... ?
It has a screen resolution of 256x192 pixels and a text screen size of 32x24 in eight colours.
It has a good array of ports:
- two MSX-compatible joystick ports
- RCA jack for 8Ξ© speaker (there is also an internal speaker)
- 8-pin DIN for cassette (seems a little excessive)
- 8-pin DIN for RGB and composite video
- Printer port
- System bus expansion port
- Space for an RS232 port
The composite video output can be switched between colour (γ«γ©γΌ) and monochrome/B&W (γ’γγ―γ) and the cassette can be switched between 600 & 2400 Baud.
Some good information here:
kameli.net/marq/?page_id=1270
github.com/ypsitau/jr200
github.com/0cjs/sedoc/tree/main/8bit/jr-200
00:00 ... Intro
01:45 ... External ports
04:50 ... Testing composite video output (NOK)
06:50 ... Opening the case
09:00 ... Keyboard
10:35 ... Motherboard
13:15 ... Closer look
15:30 ... Channel thanks & outro
--------------------------------
Check out my Patreon for regular blog-type updates between videos - there is a free membership tier and two paid tiers (US$2 and US$5). There is also a one-week trial for the paid tiers so if you don't think it's worth it, then cancel ... no hard feelings ... I appreciate any support, even if it's just subscribing to my YouTube channel!
patreon.com/TheCluelessEngineer
--------------------------------
Outro music: "Lexicon" (White Bat 40) by Karl Casey @ White Bat Audio
karlcasey.bandcamp.com
youtube.com/@WhiteBatAudio
![π―π΅ National γγ·γ§γγ« JR-200: Part 1 (First Look) [#TCE0695]](https://i.ytimg.com/vi/wLMDZcOQIaI/mqdefault.jpg "π―π΅ National γγ·γ§γγ« JR-200: Part 1 (First Look) [#TCE0695]
Ad-free version on my Patreon ... https://www.patreon.com/TheCluelessEngineer
Lets have a look at this MC6802-based computer, released in 1982, from Matsushita in Japan. Unfortunately it seems to be faulty so well work on that in Part 2 after giving it a bit of a clean.
It was also sold as the Panasonic JR-200U (North America) and the JR-200UP (PAL) in Europe. It succeeded the JR-100 and preceded the JR-300.
This machine is from Japan so requires 100VAC (were 240VAC here in Australia) so will need a step-down transformer. But it might be possible to convert by swapping the transformer (100-to-21V).
Its main chips are:
- MN1800A CPU (an MC6802 minus the clock generator & with the internal RAM disabled ... so, like an MC6800?)
- HD61K201F CRT (plus other things) controller
- MN1271 I/O interface (equivalent to two 6522 VIAs?)
- MN1544CJR 4-bit microprocessor for the keyboard & joystick I/O
Ignoring the CPU, its a bit of an odd machine ... it has 32KBytes of RAM implemented as four 4864 64Kbit DRAMs ... 4-bit RAM? There is 4KByte of video RAM (two 6116 SRAM) which would be faster as its 8-bit ... ?
It has a screen resolution of 256x192 pixels and a text screen size of 32x24 in eight colours.
It has a good array of ports:
- two MSX-compatible joystick ports
- RCA jack for 8Ξ© speaker (there is also an internal speaker)
- 8-pin DIN for cassette (seems a little excessive)
- 8-pin DIN for RGB and composite video
- Printer port
- System bus expansion port
- Space for an RS232 port
The composite video output can be switched between colour (γ«γ©γΌ) and monochrome/B&W (γ’γγ―γ) and the cassette can be switched between 600 & 2400 Baud.
Some good information here:
http://www.kameli.net/marq/?page_id=1270
https://github.com/ypsitau/jr200
https://github.com/0cjs/sedoc/tree/main/8bit/jr-200
00:00 ... Intro
01:45 ... External ports
04:50 ... Testing composite video output (NOK)
06:50 ... Opening the case
09:00 ... Keyboard
10:35 ... Motherboard
13:15 ... Closer look
15:30 ... Channel thanks & outro
Check out my Patreon for regular blog-type updates between videos - there is a free membership tier and two paid tiers (US$2 and US$5). There is also a one-week trial for the paid tiers so if you dont think its worth it, then cancel ... no hard feelings ... I appreciate any support, even if its just subscribing to my YouTube channel!
https://www.patreon.com/TheCluelessEngineer
Outro music: Lexicon (White Bat 40) by Karl Casey @ White Bat Audio
https://karlcasey.bandcamp.com
https://www.youtube.com/@WhiteBatAudio")
![π·πΊ Sura PC8000 (Π‘ΡΡΠ° ΠΠ8000): Part 1 (First Look) [#TCE0690]](https://i.ytimg.com/vi/wWDCWSeaxUg/mqdefault.jpg "π·πΊ Sura PC8000 (Π‘ΡΡΠ° ΠΠ8000): Part 1 (First Look) [#TCE0690]
Ad-free version on my Patreon ... https://www.patreon.com/TheCluelessEngineer
Lets have a look at this ... inspired by MSX ... computer from the Soviet Union, specifically the Russian SFSR. Unfortunately this one isnt working ... the 220VAC power supply is making a horrible whining sound ... more info below ... likely all of those beautiful electrolytic capacitors have probably failed.
The MSX was apparently imported in the late 80s and used in education. An attempt was made to reproduce a domestic version but it simply wasnt possible with the available Soviet technology at the time.
One major difference is the use of the ΠΠ 580ΠΠ80Π, the Soviets clone of the Intel 8080, and not the Z80. I believe it was kind-of compatible in BASIC but that was about it. It also uses the Soviet-era JCUKEN keyboard layout, not QWERTY.
This particular model was built in 1989 and sold for 1035 Soviet Rubles (maybe just over four months salary at the time).
There were other versions produced by other factories called:
- ΠΠ΅ΡΡΠ° (Vesta)
- Π₯ΠΎΠ±Π±ΠΈ (Hobby)
- ΠΠ°ΡΠ°Ρ (Carat)
The PSU is supposed to generate +5VDC and Β±12VDC but doesnt appear to be doing do ... it also needs -5VDC for the ΠΠ 580ΠΠ80Π (Intel 8080A clone) which it generates from the -12V and +5V rails. Im thinking that I will repurpose the replacement PSU I designed for the Sanyo PHC-30N so I can run it on just +12VDC (will add to my Github).
It doesnt have dual cartridge ports but has dual DD50-like ports ... X1 and X2 ... theyre not truly DD50 as theyre using Soviet 2.5mm pin pitch.
More information can be found here:
https://pk8000.narod.ru/
https://ru.wikipedia.org/wiki/ΠΠ8000
And I will put information on my Github here:
https://github.com/BrettHallen/Sura_PC8000
00:00 ... Intro
03:30 ... Information plate
04:30 ... Ports
06:20 ... Opening the case
11:40 ... Removing the daughterboard
13:55 ... Heat sinks?
14:35 ... Video pinout
17:00 ... Power on attempt (NOK)
18:35 ... Wheres the -5VDC for the 8080?
22:00 ... Channel thanks & outro
Check out my Patreon for regular blog-type updates between videos - there is a free membership tier and two paid tiers (US$2 and US$5). There is also a one-week trial for the paid tiers so if you dont think its worth it, then cancel ... no hard feelings ... I appreciate any support, even if its just subscribing to my YouTube channel!
https://www.patreon.com/TheCluelessEngineer
Outro music:
Sunshine Drive
https://youtu.be/HBQbFCq-G2E
Lavaros @LavarosMusic
https://lavaros.bandcamp.com")
![π¬π§ Psion Organiser: Part 2 (Comparing the Organiser I & Organiser II) [#TCE0527]](https://i.ytimg.com/vi/wuXOnCx6u9I/mqdefault.jpg "π¬π§ Psion Organiser: Part 2 (Comparing the Organiser I & Organiser II) [#TCE0527]
π¬π§ Psion Organiser: Part 2 (Comparing the Organiser I & Organiser II) [#TCE0527]")
![π¦πΊ Breville BSK500 Kitchen Scale Teardown [#TCE0500]](https://i.ytimg.com/vi/yDk3B_En0bc/mqdefault.jpg "π¦πΊ Breville BSK500 Kitchen Scale Teardown [#TCE0500]
π¦πΊ Breville BSK500 Kitchen Scale Teardown [#TCE0500]")
