I found some parts to built 7 MHz prints.
So I hope in a few months to have aprox 20 prints.

I'll let you know when I have information

What is this Turbo 7 mhz ? A kit to double the clock frequency or an expansion board containing a different processor ? Excuse me if this is a trivial question, but I am not very familiar with the upgrades an expansions post 1990.

is it possible to upgrade an msx2+ to a turbo r model?I am thinking of upgrading my msx2 to a msx2+ model change all needed stuff and the chipset v9938 to v9958 but i think i would like it if my msx could be turbo r too ,is it possible to fit a r800 to an ordinary msx2+ ?

Hehe, wouldn't that be nice? But no, to my knowledge, you'd still miss some important parts; the S1990 (with the Z80 built-in), different memory structure, so I suggest you'd go for some eBay auction

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What is this Turbo 7 mhz ? A kit to double the clock frequency or an expansion board containing a different processor ? Excuse me if this is a trivial question, but I am not very familiar with the upgrades an expansions post 1990.

I have schematics of a 6 MHz board that are from 1989, so that should be old enough for you to be familiar with It's probably similar to that. My guess is that 6 MHz was as fast as any Z80B would go in 1989.

By the way, that only contains three easily obtainable 74LSxx chips that shouldn't take months to source ($0.84 for the three from Futurlec).

@D-tail: The s1990 doesn't have a build in z80. That's in the T9769

I have schematics of a 6 MHz board that are from 1989, so that should be old enough for you to be familiar with It's probably similar to that. My guess is that 6 MHz was as fast as any Z80B would go in 1989.

By the way, that only contains three easily obtainable 74LSxx chips that shouldn't take months to source ($0.84 for the three from Futurlec).
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Could you post the schematics somewhere?

Maybe send them to Hansotten.