Dumping/reverse engineering MSX models thread

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By Manuel

Ascended (19463)

Manuel의 아바타

30-03-2023, 22:07

Thanks, now also emulated by openMSX.

The colors are still a bit off... perhaps they are different on NTSC, but I'm not sure how to make some good measurements to improve that. Or, perhaps the analog output of this machine is just quite off due to caps being bad or whatever.
Anyway, we use the palette measured for Toshiba VDP's on Gradiente (T7937A).

By Takamichi

Hero (637)

Takamichi의 아바타

31-03-2023, 18:13

Manuel wrote:

Thanks, now also emulated by openMSX.

The colors are still a bit off... perhaps they are different on NTSC, but I'm not sure how to make some good measurements to improve that. Or, perhaps the analog output of this machine is just quite off due to caps being bad or whatever.
Anyway, we use the palette measured for Toshiba VDP's on Gradiente (T7937A).

The closest openMSX MSX1 palette to PC-70100 is so far Sanyo MPC-10 which looks more similar than Gradiente Expert DD Plus to me. Besides the possible deterioration by age, if T7937 can intrinsically output only PAL there must be an NTSL converter and it might be impacting the video.
The display and camera disturbances must be taken into account too. Modern TVs are not optimized for coaxial inputs. Here are several examples including MPC-10 palette displayed on openMSX and the real MSX + MPC-10 that COLOR 10 and 11 are greener. I have VHS-to-DVD converter for PC that messes up MSX inputs but I included it anyway.

Whatever I reposted the reverse engineering result photos taken via Framemeister instead of the direct coaxial cable connection. Please note white characters look ugly with Framemeister. I will fetch an HDMI capture device to eliminate camera later.
Edit: Can anyone convert real Gradiente Expert DD's output to NTSC and see if it shifts to this?

By Manuel

Ascended (19463)

Manuel의 아바타

31-03-2023, 21:50

By Takamichi

Hero (637)

Takamichi의 아바타

01-04-2023, 18:07

I uploaded all PC-70100 results, including MSXMEM.BAS I forgot before, taken with Framemeister & PC capturing device here along with a few MPC-10 ones for comparison. Palettes don't look much stranger than other MSXs now. Too much red seems to be added but I decided not to care. I can't obtain better result now.

By shalafi

Master (137)

shalafi의 아바타

08-05-2023, 22:54

Dynadata DPC-200 (version 2) here: https://drive.google.com/file/d/1C7LUDlayLwVn-DCQ8pFNDi0baFf...

I dumped it myself, I was not aware that nobody had done it yet.

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