System Memory Maps
Hex Range
Function
000000 to OO9FFFF
640KB System Board RAM *
0A0000 to OBFFFF
128KB Video RAM
0C0000 to ODFFFF
128KB 1/O Expansion ROM
0E0000 to OFFFFF
128KB System Board ROM
100000 to 15FFFF
384KB System Board RAM
160000 to FDFFFF
Channel Expansion Memory Addresses
FE0000 to FFFFFF
128KB System Board ROM
* With the system board in the setup mode, the system board
memory can be
disabled through System Board POS Register 3 (see page
2-9).