Video Telopper FS-UV1 is a (big) cartridge for MSX2 to place an image or text on top of MSX image (Superimposition). MSX start on firmware, however All functions are handled from the Basic with following instructions.
- Set the color 0 in transparent:
VDP(9)=VDP(9) AND &HDF
- Superimposition instruction:
SET VIDEO vm,el,cbm,am,vos,voc
vm = 0 or 1 for computer, 2 for superimpose, 3 for external video
el (external luminance) = 0/1 for normal/half tone
cbm (color bus mode) = 0 IN, 1 Out
am (audio mode) = 0 ~ 3
vos (video output select) = 0/1 for RGB/composite
voc (video output control) = 0/1 for ON/OFF
The firmware is ignored by pressing DEL key at MSX's start up
FS-UV1 seems to use same I/O ports #88~#8b as the Neos Version UP Adapter MA-20.