The one which is being sold at Japan (well, now I am waiting one, which will be arrived soon )

I have an update for you. After you apply it, it will give you a display in various shades of black.

if putting multiple VDPs together, especially more than 2, there should be a possibility to send the data via color-bus to external DACs. Then we could have some new screen modes.

VDP1 - connect to red DAC
VDP2 - connect to green DAC
VDP3 - connect to blue DAC
set all to screen 8 and get 24-bits total per pixel, 16M colors, or use screen 7 and get 12bpp

or what about adding/subtracting the output of one VDP for a transparency effect?

also, although it would seem to be a lot of work for a plain Z80 to control 4 VDPs, at least VDP commands will run in parallel. Imagine using screen 5 but only use a quarter of the screen on each VDP. Leave the rest of the area blank. When all images are combined you get a full screen but since each VDP is only using a 256x53 area then it can be fully redrawn 4x as fast.

Quote:

http://v99.isocomponents.com/part/V9958

I must say I was baffled to see that those Yamaha components were still for sale
You can even find V9938s on this website
I thought all those were obsolete and impossible to find !