Principle Ic Specifications; A.1.L Roma Board; Hm65256Bsp-15 - Epson LQ-2550 Technical Manual

This chapter describes the principal ICS
Table A-1 shows the primary ICS used on the
Name of IC
Location
13A
7B
D275 12-J2 '
1A
1A M5L27256K"
M5L27256K
7A
12A M40A13KA*'
12A
12B M 10A13KA*1
9A

HM65256BSP-15

10A ~PD43257C-15
14A E05A 10AA
2A E05A02LA
3B, 4B E05A09BA
M546 10P
7D
STK6981 H
7C
2C
H8D2 148
1A
STK66082E
6A
74LSO0
5B, 6B 74LS05
5A
74LS 123
14A 74LS 175
9B 74 LS365A
8A
74 LS373
-
4A
SN75 188N"2
3A
SN75 189N'2
9C
TL431 CLPB
the VP-3000 (Japan only).
in
used in this printer.
Table A-1. Primary ICS on the ROMA Board
Type
CPU
CPU
1
2
Mask-ROM
Mask-ROM
Mask-ROM
ST-RAM
Gate array
Gate array
Gate array
Hybrid IC
Hybrid IC
Hybrid IC
Hybrid IC
TTL
TTL
TTL
TTL
TTL
-
I Ic
board.
Description
CMOS 8-Bit
NMOS 8-Bit
Program ROM for HD64 180R1 P6
Program ROM for HD64 180R 1 P6
Program ROM for wPD7810HG
4M-Bit Kanji C.G.
2M-Bit Alpha, numeric, and graphics
graphics C.G.
Memory Management Unit
Motor Control Unit
8-Bit Parallel l/F
PF Motor Driver
CR Motor Driver
HF Motor Control and Driver
Quad 2 Input NAND
Hex O.C. Inverters
Dual Retriggerable Single Shot
Quad D-FFs
Hex 3-State Bus Buffers
Octal 3-State D-Latches
Quad Line Drivers
Quad Line Receivers
Adjustable Precision Shunt Regulator
A-1
REV.-A
Reference
Section
A. 1.1.1
A. 1.1.2
A. 1.1.3
A. 1.1.4
A. 1.1.4
—
—
—
A. 1.1.5
A. 1.1.6
A. 1.1.7
A. 1.1.8
A. 1.1.9
A. 1.1.10
A. 1.1.11
A. 1.1.12
A. 1.1.13
A. 1.1.14
–
A. 1.1.15-
A. 1.1.16
A. 1.1.17
A. 1.1.18
A. 1.1.19
A. 1.1.20
A. 1.1.21
A. 1.1.22
A. 1.1.23