Panasonic KX-FP81BX Service Manual page 129

6.3.4. ROM (IC502)
This 512KB ROM (EPROM or MASKROM) carries a common area of 32KB and bank areas which each have 8KB (BK4~BK63).
The addresses from 0000H to 7FFFH are for the common area and from 8000H to 9FFFH are for the bank areas.
6.3.5. STATIC RAM (IC504)
This 32KB RAM carries a common area of 8KB and bank areas which each have 12KB. The addresses from 0000H to EFFFH are
for the common area and from A000H to CFFFH are for the bank area.
6.3.6. DYNAMIC RAM (IC503)
The DRAM serves as CPU and receives memory.
The address is F200H~F3FFH (DRAM access window 1) and F600H~F7FFH (DRAM access window 2).
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KX-FP81BX / KX-FP81CX / KX-FP82CX