Memory; System Memory Map - NEC Advanced Personal Computer System Reference Manual

Processor PCB
2-26
2.6 MEMORY
Figure 2-17 is the system memory map that shows how the memory space addresses
are allocated.
00000
20000
AOOOO
AI000
COOOO
DOOOO
EOOOO
FOOOO
FEOOO
FFFFF
STANDARD
RAM
EXPANDED
RAM
4KBBM
DUPLICATE
BBM
ADDRESSES
ALPHANUMERIC
ROM
(NOT USED)
SPECIAL
CHARACTERS
RAM
ROM DUPLICATE
ADDRESSES
8KROM
Figure 2-17 System Memory Map
'\
/
<
11
128 KB
128
KB
MAIN MEMORY
640 KB
(USER RAM)
BATTERY-BACKED MEMORY
(4 KB REPEATED 32 TIMES)
DISPLAY
MEMORY