MSX1

http://faq.msxnet.org/msx1.html#PX7
The ER-101 is almost an MSX computer on itself! It sort of makes your MSX a Pioneer PX-7. It includes Laser Vision Player Control, Superimpose and P-Basic (extended MSX-Basic), just like is built in in the PX-7. For more pics check the MSX Hardwarelist.

Until now the laser linking of Laser Vision with MSX has only been available on Pioneer equipment but this has changed now that Pioneer have put the ER-101 interface unit into general release. The ER-101 allows any MSX computer to be used with laser discs.
The ER-101 Expansion processor unit looks like a slim-line video recorder and it can be easily placed on top of the Laser Vision player. It expands your ordinary MSX by adding an extra video processor chip called a TMS9928/A and an extra 2kB of RAM and further 16kB of video memory. An 8kB ROM provides extra commands called P-BASIC.
Some of the space games are really sensational. You can guide a spaceship generated by the MSX graphics through a meteor storm generated by the very high resolution pictures recorded on the laser disc.