Sharp MZ

Color Display Adapter (Note) This is an article of the I/O September 1981 issue that modifies the main body. 0E0C1H: Color data 　　Bit7: unused 　　Bit6: front red 　　Bit5: Front green 　　Bit4: Front blue 　　Bit3: unused 　　Bit2: Back red 　　Bit1: Back green 　　Bit0: Back blue 　　　Add back RAM to V-RAM 0D000H...

No progress so far?

deleted

The fact that MZ-800 is able to read/write QD through its ROM (unlike MZ-700) may a good indication that it should be possible if the emulated QD controller handles all the possibilities given by the Z8440 registers. A look at the arduino file shows there is that function "qdisk_write_byte_into...

For MZ-80A/MZ-1200 through the video connector:

The MZ-80K mirrors each 1K pages in $D000-$DFFF so it isn't possible to map the color pages at $D800-$DBFF as it conflicts with character VRAM. I would expect the same for the others like C/KE/KE2. To circumvolate that obstacle, we can use an "inker" : in the magazine it is $E00C. So we wr...

Which means the same card should probably work as well with an MZ-80A.

The MZ-1200 and MZ-80A have a lot of hardware parts in common: there is a connector which allows to add a color board (the engineers already thought about that addition): *** the one for MZ-80A (pins are present) *** mz80a_6.jpg *** the one for MZ-1200 (pins are not present) *** mz12_6.jpg And here ...

Good job! that was something really annoying when searching 1500 programs.

Yeah MZ-1200 and MZ-1500 being purely Japanese-only machine it is natural not to find any information at that time. Even now it may be dodgy to find their documentations as they are mostly written in Japanese and that Google search is not an easy place to dig them out.