I think the eeprom rewrite fixed this (nw)
Jubilee Double-Up Poker (TMS9980) updates... [Roberto Fresca]

 - Demuxed the input system.
 - Hooked an cleaned all inputs, except the coin in (missing).
 - Added NVRAM support.
 - Added technical notes.
namcos12.c: Documentation update - NW
PC-9801 / upd7220: Fixed Quarth video paging [Angelo Salese]
Attempt to fix Xevious ...
Note update
Another note ...
Correct patch
Jubilee Double-Up Poker: Fixed the NVRAM size.
 Video and working RAM are both halves of the
 same device (TC5517AP-2, tied to a battery).
 Also added technical notes. [Roberto Fresca]
Extra service input found...
Converted palette_t and palette_client to classes. General palette.c
cleanup.