Do I have a bad disc?

[wilykat]

On Duo-R I tried to play Might and Magic III and the graphic seems off to me.



Is that how it's supposed to look?  The animated part and the text seems fine but the static part seems funny.  My Duo-R doesn't show any glitches when I played Space Fantasy Zone, Dungeon Explorer 2, and other games.  I'll do Populous next, I got a few more CD games to check.  Space Fantasy Zone and M&M3 are the only ones I have on CD-R.

If it is bad game,  [snipped]

[thesteve]

try YS3
let the intro run through and look for grafx glitches

[wilykat]

I have the legit US Ys III and part way through the intro the screen turned black with lots of colored squares. I was able to skip the rest of intro and got start/continue screen looking normal.

Maybe a bad chip?  I'll record the scene and make a new thread in repair section.

[thesteve]

sounds like you have bad data on the PCM ram
could be trace or chip

[wilykat]

So which one is the RAM chip?  The service manual only covered TG-16 and nothing about any of Duo.

[thesteve]

your PCM RAM are the 2 chips just left of the cd mech with the legs curled under them (near the supercap)
seen bad traces to them a few times and failed chips once

[Necromancer]

... where can I find a clean download? 

Use google.  Asking openly for ISOs and ROMs is a bannable offense.

[thesteve]

duo-r board IC509 and IC510 center of board, topside
look for corrosion near the chips

[wilykat]

I made new thread in repair section since it's hardware issue, not game issue: http://www.pcenginefx.com/forums/index.php?topic=19474.0 I've posted a very good closeup of the board with the 2 ram chips.  No visible corrison on top around the chip.  So it's either hidden bad trace, bad vias, or bad solder joint.