This appears to be the CPU. It's the biggest chip on there, and it's right in the middle. note that it's Roland made. What a huge company! Maybe it's a variant of another well-known CPU as some listmembers have noted?
This is just simply a Flash EEPROM. This is most likely where the OS is stored. You can find the data sheet on the web. It's specs are 8Mbit, or 1 Megabyte. Arranged as either 512Kx16, or 1024Kx8.
This is a DRAM chip. TMS418169. You can find the specs online. It's 1Mx16, or 2 MegaByte. Probably used as program memory.
Another speciality Roland chip. No idea what this one does!
Ah-ha! Borrowing an effect processor chip from it's own sub-company (Boss). We find the Boss R01231334. Very interesting! Wonder if this little doobie finds itself in any other Roland/Boss Hardware?
This chip, the Toshiba TC9271F, is listed as a "Modulation/Transmission IC for digital audio interface"
I couldn't find exact specs on this chip, although I found many chips similar to it. They were all SCSI adaptors. Perhaps this is the IDE adaptor for the Zip Drive? Or perhaps it's a SCSI adaptor for other options? The Edirol A6 perhaps???
Not sure what this one is. Probably a codec or filter IC for the codec.
