Ps Board (Ol610E/Ps); Program & Font Roms; Dram; Eeprom - OKIDATA OL600e Service Manual

2.2

PS Board (OL610e/PS)

The PS Board consists of two Program & Font ROMs, DRAMs, an EEPROM, and a host
interface circuit.
Program & Font ROMs
The Program & Font ROMs store the PostScript Level II program and its fonts. Mask
ROM is used for the Program & Font ROMs.

DRAM

0.5MB of DRAMs reside on the PS board.

EEPROM

4,096 bit-Electrically Erasable PROM (EEPROM) is mounted on the PS board for storing
the PostScript menu settings.

LocalTalk Interface

AppleTalk protocol data is received from the host system via LocalTalk interface. The
block diagram is shown in Figure 2-4.
LocalTalk I/F
(RS422 I/F)
Operation Description
Program & Font
ROM
4MB Mask ROM
SCC
85C30
Figure 2-4 PS Board Block Diagram
2 - 9
Resident RAM
(0.5MB)
EEPROM
(4K)
OL600e/610e/610e-PS/610e-S
Service Manual, P/N 59271602
LQ6C