I always been interesting in all that KORG's chip abbreviations.
No doubt, I have a gut feeling on that TGL is a Tone Generator related chip, but what MAP is?

Unfortunately, I've never seen inner Korg's documentation, like naming convention, or data structures of AI2 synths. (I beg you to contact with me, if you have some ^__^ )

But today, I've got Wavestation service manual, and there were a little, but priceless passage on this:

MAP16 - Decoder/card buffer, The main functions are Gate Array function connected with CPU such as Address Latch, Address Decoder, R/W Pulse Occurrence Circuit and the interface with IC card.

KSP - Key scan processor. Scans the data of the keys, the panel switches, the wheel, the joystick and the pedals, converts those data to serial and transmits them to CPU.
Sweet little passage. I wish there were a memory map and programming manual for TG. ^__^

I am on comparing PCM parts of KORG'z AI synths.
Kinda funny, it seems clear why it is rumoured than one sounds better than another.. I found out, that some chips data lines are tied partly. (8 instead of 16) On X3, two chips used 16bit  data bus, and one 8 bit. Is it made for storing compressed samples maybe? Someday, I dump these chips to check it out.

			Model PCM size Chips Sample Q,bit CPU M1 16Mbit x8 16 uPD70216 O1W 48Mbit 16 uPD72016 (uPD70208) 01W-Pro_ProX 80Mbit 16Mx5 16 uPD72016 01rw 48Mbit 8Mx6 16 uPD72016 05RW 48Mbit 16Mx3 16,12,8 uPD70325 X3 48Mbit 16Mx3 16,12,8 uPD70433 X2 64Mbit 16Mx4(?) 16,12,8 uPD70433 N264/364 64Mbit 16Mx4 16,12,8 uPD70433 X5D 64Mbit 16Mx4 12,8 uPD70433 T1,2,3 64Mbit 4Mx16 16 uPD70216 Wavestation EX 20 HD641016CP10 i2 16Mx4 16,? uPD70433 CS303 2Mbit 16Mx1 16 uPD70433

I dig into AI2 synths hardware as hobby.