If trainer mode is turned on, bios still resides in memory until done
or manually switched off.
;Placed in trainer at $6000
Result, bios restarts, therefore still in memory.
Settings used in test.
46432047414D4553 -FC GAMES
40 512k PRGROM
00 0 CHRROM
60 First Bank Location to put trainer data
60 - Branch to $6000 when trainer is invoked
01 - # of 200h trainer segments
80 - D7 set, so trainer mode is on
20 - MMC1 mode, shouldn't matter
F0 - PRGROM mask, shouldn't cause the bios to be switched on or off
Sram bit set
It is possible that changing some header bits may yield a different response, but it doesn't seem likely.