MAMEWorld Forums - News - Re: Dr. Decapitator Update: Happy Holidays

> > > http://decap.mameworld.info/
> >
> > Excellent to hear!
>
> I'm looking forward to #123 C-chip and #17 Qsound should be interesting.
#123 (the C-chip from Bonze Adventure) is unfortunately dead and cannot be completely read out; the EPROM die on it is damaged. We will eventually need another one.
The C-chip as a whole is a very interesting contraption:
It consists of several "chips" crammed onto one IC, a lot like a successor to the Toshiba T5182, but made by probably NEC instead. It contains:
* One Mask-ROM NEC upd78c11a (upd7810 compatible) w/4k of mask ROM (this is intact on chip 123 and will be read out, but is probably the same on all the various C-chips)
* A battery-backed ?16k? NVRAM chip (which may also act as the upd78c11's external ram)
* A ?16k? EPROM (this is damaged and cannot be read on chip 123)
* An ASIC Logic array to tie everything together (this will probably eventually get imaged and traced out, as there may be a way to read the EPROM contents without actually decapping the chip at all)

#17 is an AT&T WE DSP16A processor with a 4096x16-bit NOR ROM which either needs to be stained to show the bits, or, more likely, to be similarly bus-attacked as the upd77c25 chips were.

...

> #107 needed a higher magnification of the die to verify some questionable bits. based
> on what i read in the shout box earlier this year.
>

This was done tonight/last night.

LN

"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"