System Memory Map; System Memory Maps - IBM Personal System/2 60 Technical Reference

System Memory Maps
The following figure shows the mapping of the memory locations on
the Model 60. A 256-byte portion of this RAM is reserved as a BIOS
data area. A 1 KB portion of this RAM is reserved as an extended
BIOS data area. See the IBM Personal Systeml2 and Personal
Computer BIOS Interface Technical Reference for details.
Hex Range
000000 to 09FFFF
OAOOOO to OBFFFF
OCOOOO to ODFFFF
OEOooO to OFFFFF
100000 to 15FFFF
160000 to FDFFFF
FEOooO to FFFFFF
Function
640KB System Board RAM'
128KB Video RAM
128KB 1/0 Expansion ROM
128KB System Board ROM
384KB System Board RAM
Channel Expansion Memory Addresses
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).
Figure 3-4. System Memory Map
3-8 Model 60 System Board