Oki PACEMARK 4410 Service Manual page 16

(4) CG ROM (IC48)
This is a 256K x 16 bits (4M bits) EPROM with the font data for the characters stored.
CG ROM is assigned to the program memory area of the MPU and is fetched by the RD signal
of the MPU.
The following shows the memory access operation.
MPU
ALE
RD
WR
CS
CLK
MPU CLOCK
ALE
A16~BHE
AD0~AD15
RD
CS
Main LSI
A16~BHE
AD0~AD15
NHDC LSI
A16-BHE
A0–A15
Figure 2.4
A17
A16
A1~A16
A0~A15
OE
CE
BANK0
BANKS
CS
D0–D15
15
CG ROM