$000000-$01FFFF ROM
$100000-$1FFFFF RAM
$F00000-$F000FF IO0 (8254 or compatibles)
$F00100-$F001FF IO1 (HD44780 compatible LCD)
$F00200-$F002FF IO2
$F00300-$F003FF IO3
$F00400-$F004FF IO4
$F00500-$F005FF IO5
$F00600-$F006FF IO6
$F00700-$F007FF IO7
