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TransWarp GS

TransWarp GS Question

    I know that 65816 always starts at $FF/FFFC or $FF/FFEC for cold reboot.
I understand that TransWarp GS has its own data or program that has
approximately 32KB from $8000 to $FFFF in bank $BC.
    In fact, 128KB ROM in both bank $FE and $FF are ALWAYS UNCHANGED while
it uses bank $BC to display TransWarp GS name and audio before starting cold
reboot.
    I wonder how do 65816 cause to map to $BC/FFFC instead of $FF/FFFC while
ROM is never modified by Applied Engineering.

Bryan Parkoff
BParkoff@satx.rr.com