Nikko made msx computer?

The latter part of your sentence: "not the T7937" I.e. there's a pin to configure the video standard.

That pinout is incomplete. Some of the missing pins are present in the schematics of the computers listed in that page.
But this is something that should be discussed in WIKI discussion thread, not here.

Pentarou, you say I'm wrong in insinuating that it is easy to verify while I say myself that Arabic countries, Italy and Spain used PAL at 50hz and Brazil used PAL-M at 60Hz. So there must be something missing. And now you don't mean why here? What is your goal? Why didn't you just add what's missing in the wiki? If you don't know how to edit the wiki you can say so here, it's not off topic and it would have avoided useless posts.

Hello everyone I finally managed to start PC-70100. Photos Findings so far:
- NTSC, not PAL
- The character set is basically Japanese though some characters like 1 bit kanjis are missing.
- The blank key works as RETURN and not as kana or code. Kana is enabled/disabled by pushing > and / keys together.
- 2.5 mm center positive 9VDC power works fine. Power consumption measured by 1 SPOT mA Meter is around 194 mA.
- External disk drive is recognized but doesn't work and returns Disk I/O error.
- Slot configuration displayed by Tiny Slot Checker booted with GR8NET is this
- Several MSX roms worked fine in the slot.

Oh I was not looking at the slot map carefully.