3 strange cartridges from Sony that no internet site talk about

Hi people,

I recently found 3 cartridges for MSX on a flee market and I can't find any information about it.

the cartridges are labeled :

CD Check Soft / slot 2 / Sony Hit Bit /part no 3-702-102-01
CD Check Hard / slot 1 / Sony Hit Bit /part no 3-702-103-01
CD GAINADJ Hard / slot 1 / /part no 3-702-105-01

The CD Check Soft is a normal cartridge.
the CD Check hard has a hole with a 4-pin connector.
the CD GAINADJ Hard is quiet big (like Phillips sound module) and there is a hole with a mal AC adaptor plug and a 5-pin connector)

When I put those cartridges on an MSX, only "CD Check Soft+CD Check hard" works, and there is a menu with many setting possible and strange diagram

Does anybody has some informations on it ???

waiting for your comments...
/i/iathieu

Well, looks like you found some Sony test cartridges to find defects in MSX computers. Dunno anymore if these are for MSX1 or MSX2 computers.

You should check this info with Bas Kornalijnslijper (he has his own msx page, use google). Bas is a Dutch MSX computer repair-guy. Check with him. Maybe he has use for it and you guys can set up a trade or something.

-Sakamoto