Gates the 68k data bus to the memory card slot and palette RAM. Only found in AES systems ?

PROG B22 (AES cart ROMOE ?) = ROMOEU AND ROMOEL like in NEO-E0 ?

PALWE = PAL OR R/W.

Pinout

OpenOffice Draw file: File:Neo-g0.odg

D0~D15: 68k data bus
PALD0~PALD7: lower byte of palette data
PAUD0~PAUD7: upper byte of palette data
MCD0~MCD15: memory card data bus
(51) is the select input. Chooses which set of 16 inputs to output at "D0-D15" (confirmed on MV-2F chip used as ADPCM-A multiplexer. "select" input comes from "SLOT0" on NEO-F0).

NEO-G0