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from Worp3 site:

The Orbit project is a brand new challenge for our WORP3 team.
It will be a new MSX hardware compatible platform, completely built from scratch.
To give an idea of our design goals, here are some target design specifications:
-A very enhanced Z80/R800 binary compatible CPU which has a fully pipelined 32 bits architecture.
-The main memory will have a minimum capacity of 2 GBytes, bus width will be 32 bits.
-A high end video processor which is powerful enough to handle HDTV, yes MSX is going HD !
The VDP will have its own high bandwidth memory and has a VG9958 compatible subset.
-Audio sound processor on board.
The housing is half rack size, 19 inch. Mounting brackets can be placed.

http://www.worp3.com/main.html

looks promising!

could be usefull:

http://www.waitingforfriday.com/index.p … _Datasheet

from the site:

Sid Master 99 is a PEB interface cards that integrates an MOS 6581 or MOS 8580 SID chip into the architecture of the TI99/4A as a memory mapped device.   It can be accessed through any  language that allows normal CPU memory access such as assembly language, Extended BASIC etc.  If you can do a CALL LOAD or equivalent then you can access the SID chip.   A new vista of never before heard sounds can now be played through your TI99/4A.  No sound cables required.  It is completely compatible with the existing sound chip on the computer and plays through your monitor or TV...

http://www.dsapsc.com/what-is-sid.html