New Online MSX emulator

Only Sony and Panasonic made MSX2+ machines and they were only available for Japanese market. Later many hobbyist have binary patched their own ROMs to have other localisations. The dis-assembly project is also hobby project that is still slowly going on (I think)so it would not surprise me if there was still some errors. How the original ROM's were built is has remained secret of Microsoft, but I have strong feeling they used MS-DOS compatible computer running M80/L80 compiler. At least this is how MSX-DOS was made. (also using 8" floppies ) I think there was also a book where original MSX1 BIOS source code was printed, but don't remember the book name anymore.

Ha! Line width didn’t change, but surprise surprise, the border is still striped. So it’s not actually forcing a mode switch, but rather just a switch in the part which reads the VRAM data, interprets it and outputs pixels.

And are the pixels fat or thin?

ppeccin: Actually they were interspersed 4 pixels wide bars, also in screen 5, in screen 7 I got dots. The clear colour was set to 4 btw.

manuel: I used the exact program ppeccin provided, just replaced SCREEN 7 by 5 and 6. I didn’t test in openMSX whether it produces the same result. Ok ok, I’ll create a bug.

Grauw, could you make another simple test for me?
I need to know what happens if we set the YJK bit in Screen 0 ~ 4.

That simple basic program will work for Screen 2 ~ 4.

For Screen 0 and 1, you can just type some chars or do a LIST, then execute "VDP(26)=8".
Also for width 80 in Screen 0.

Can you please describe what you see?

Thank you soooo much!