IBM Personal System/2 65 SX - Page 42

Hex Range
Function
000000 to O9FFFF
0A0000 to OBFFFF
0C0000 to ODFFFF
0E0000 to OFFFFF
100000 to (100000 + XMB)
(100000
+
XMB)
to
(100000
+
XMB
+
256KB)
(100000
+
XMB
+
256KB)
to
(100000
+
XMB
+
256KB
+ YMB)
(100000
+
XMB
+
256KB
+
YMB)
to
FDFFFF
FE0000
to FFFFFF
640KB System-Board RAM
128KB Video RAM
Feature ROM/RAM
128K System-Board ROM
mapped to RAM
XMB System-Board RAM
256KB System-Board RAM
(Split-Memory Block)
YMB Channel RAM
Not Used
128KB System-Board ROM
(Same as 0E0000 to OFFFFF)
3-10
Figure
3-5.
System-Memory
Map
Model
65
System
Board
—
October
1990