Sega Saturn Console Prototype finally dug it up and took some photoes. for previous discussion years ago check out this old thread. And for more detailed description by Druid II have a look here. hope you enjoy!
That PSU looks like the Yamaha PSU with the ceramic hybrid module... Can you make pictures of that PSU too ?
Sorry mate I didn't take PSU photo. Thought I have the old one but it seemed gone missing along the way. Not sure when I have it opened again but will take PSU photo as well when I do.
That's definitely a masked ROM part (the character after "HD64" is the memory type 1=Romless/3=Mask/7=EPROM/F=Flash). From the paper label, I assume that it's one of the first batch that was supplied for customer validation of the ROM pattern.
Sorry for the bump. Do you still have the unit? I actually have one of the earliest retail units, the serial is B40000411 and is pretty similar internally to yours OP. I would be interested in buying it.
that auction was mine. asked my sister to list (I don't have one myself) it and sold to a buyer off eBay. hope the new owner can give it the love it deserves coz I just didn't have time anymore...