Did someone notice this: (I found the item on MSX Posse)

http://www.digibarn.com/collections/games/msx-prototype/index.html

I submitted the following comment:

This seems to be a prototype of a Yamaha MSX2. The motherboard says YIS-604 and CX7(M).
MSX2 was released in 1985, so it must be earlier than that. MSX(1) machines got released in 1983, so I guess it is from around that time, around 1984.

The photo http://www.digibarn.com/collections/games/msx-prototype/CIMG9421.JPG shows that the machine has an S-3527 MSX-ENGINE (called MSX-SYSTEM in Japan). This is the first attempt to put a whole computer on one chip. (A few years ago made reality by release of the 1-chip-MSX, with a whole MSX in an FPGA...) More info about this on Wikipedia, also on the Japanese Wikipedia.

Very cool pictures

Only looks like an unCASEd msx mounted on a metal plate.


Can't see any temporal cabling or anything that look like a prototype.

One of the Eproms has a date code of the 8th week of 1985, so it is impossible that this prototype was built before that date.

Ah, great info! So, it really is a typical MSX2 prototype from around 1985!

it's a joke
just a CX5MII in a metal box with MSX2 eprom
the keybaord is also CX5MII part
a prototype have not a very nice board but some wire and sold for adjust error

The PCB of the mainboard says YIS 604, CX 7, CX 7M.... definately MSX2.

yes and is also the PCB of CX5MII
look at Hans Otten page the Manual of this MSX