dr.zeissler wrote on 2021-02-24, 18:10:

tested mce in cga-mode on tandy1000 rl/hd with nec71vm.
it works great. minor issue, textmode and graphicsmode differ up to 5mm to the left.

will check if I can get a smaller image-setting so everything is visible.

Differ to what?
I had the same problem of the picture starting drawing very close to the edge, like in the overscan area of a regular TV. Using a Tandy 1000HX. The composite output is fine, I can only assume it's how the RGBI output is done, as it was expected to be displayed on a CGA monitor without overscan (while a TV uses the composite cable.)

Autocenter on TFT in textmode (like volkov/norton commander).
Monitor is on 640x240 Pixels.
Starting a game the picture in graphics mode seems to be shifted 5mm to the left.
Option1: Autocenter on TFT
Option2: Moving the picture 5mm to the left and making it a bit smaller.

though the image is better on function "auto center" on TFT I currently push the center-button on changing text/graphics-mode.
not perfect, but best quality.

the GGLabs dongle does support 6-bit RGB, you have to change the DIP switches to enable it though