BIOS RAM locations

Joypad Related
Updated by SYSTEM_IO

Memory Card Related
See CARD for more explanation on those variables.

MESS OUT Related
See MESS_OUT to know how to use this routine.

Calendar Related
Those value are updated when READ_CALENDAR is called

Other

 * Upload to DRAM
 * BIOS_UPDEST    equ $10FEF4 ;longword: destination address (!)
 * BIOS_UPSRC     equ $10FEF8 ;longword: source address
 * BIOS_UPSIZE    equ $10FEFC ;longword: size
 * BIOS_UPZONE    equ $10FEDA ;byte: zone (0=PRG, 1=FIX, 2=SPR, 3=Z80, 4=PCM, 5=PAT)
 * BIOS_UPBANK    equ $10FEDB ;byte: bank