68000 CiscOS Memory Map
-----------------------

                 -- 68008 --              --- 68000 ---           ---- 68020+ ----
Max. RAM      ...00000-BFFFF 768K       ..000000-FBFFFF 16128K    00000000-FFFBFFFF   4G
FlashROM      ...C0000-DFFFF 128K       ..FC0000-FDFFFF  128K     FFFC0000-FFFDFFFF 128K
I/O (TUBE)    ...E0000-EFFFF  64K       ..FE0000-FEFFFF   64K     FFFE0000-FFFEFFFF  64K
Host memory   ...FF000-FFFFF  64K       ..FF0000-FFFFFF   64K     FFFF0000-FFFFFFFF  64K

 address
1111 1111
9876 5432
---- ----
1110 xxxx = TRUE:  FlashROM/IO
1110 xxxx = FALSE: RAM, bank select by A19

1111 1111 = TRUE:  I/O
1111 1111 = FALSE: FlashROM/RAM