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REV .A PROnUCT DESCRIPTIOR 1 .1 FEATURES The EQU1TY IlI+ / EPSON pe P\f.. computer system inc1udes two major elements; a main system unit and a keyboard. FIGURE 1-1-1. MAJOR. COMPORKRTS The EQU1TY II1+ / EPSON PC P\f.. hardware configuration has Cl high degree of compatibility with the IBM AT and the new AT. System Performance EQU1TY 111+ / EP SON pe P\f.. has three CPU execution speeds, these are the IBN AT speed (6 MHz), the new AT speed (8 MHz) and a fast er speed (10 l'fiIz). Speed is selected by setting a three-position switch easily accessed from the front. The user can see the selected execution speed by the color of a 1ED. Wait Cycles EQUITY IlI+ / EPSON PC P\f.. uses several types of internal devices, such as RAM, ROM, 16-bit extension memory, 16-bit 1/0 device, 8-bit extensi on memory anel r,-bit 1/0 device at every CPU speed. In the case of 6 MHz or 8 MHz, the number of wait cycles is the same as the AT or the new AT. 1-1
Page 1 and 2: EPSON pe AX TECHNICAL MANUAL Seiko
Page 3 and 4: PRECAUTIONS Precautlonary notations
Page 5: PREFACE Thls manual descrlbes the t
Page 9: CHAPTER 1 PRODOCT DESCRIPTION TAßL
Page 13 and 14: REV.A PRODUCT DESCRIPTION 1.2 SPECI
Page 15 and 16: REV.A PRODUCT DESCRIPTIOH Normal De
Page 17 and 18: REV.B PRODueT DESCRIPTION 1.2.6 BMD
Page 19 and 20: HEV.A PRODUCT DESCRIPTION TABLE 1-3
Page 21 and 22: REV.A PRODUCT DESCRIPTION TABLE 1-3
Page 23 and 24: CHAPTER 2 PRINCIPLES OF OPERATION T
Page 25 and 26: 2.5.8 2.5.8.1 2.5.8.2 Commands (AT
Page 27: LIST OF TABlES Table Title Page 2-2
Page 30 and 31: PRINCIPLES OF OPERATION REV.B 2.2 A
Page 32 and 33: PRINCIPLES OF OPERATION REV.A 2.2.1
Page 34 and 35: PRINCIPLES OF OPERATION REV.B (Refe
Page 36 and 37: PRINCIPLES OF OPERATION KEV.A L5 V
Page 38 and 39: PRINCIPLES OF OPERATION REV.B 2.2.2
Page 40 and 41: PRINCIPLES OF OPERATION HEV.A Descr
Page 42 and 43: PRINCIPLES OF OPERATION REV.A +,~ T
Page 44 and 45: PRINCIPLES OF OPERATION REV.A AC OC
Page 46 and 47: PRINCIPLES OF OPERATION REV .A TAß
Page 48 and 49: N I N o Table 2-3-1 shows the memor
Page 50 and 51: l'.) I l'.) l'.) operation speed. T
Page 52 and 53: I Ṇ />0 +S r1;--;;-ilO:4-----t-+-
Page 54 and 55: N I 2.3.2.1 N 0' System Reset Circu
Page 56 and 57: N I N 00 2.3.3 Internal Memory Cont
Page 58 and 59: N I ~ 2) DATA SIGNAL GAATDB control
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N,W N 2.3.4 Byte/Word Access & 16-8
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N I ~ LSAO SIGNAL (XAO SIGNAL) The
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N I I,o,l (7\ ! !I:! ~ 1401 l 1400
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N I ~ rA _ 00 (DIAll ~~~~~~~~~~~GDH
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N I oll' o * The 8 bit device rea
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N Ja. N 2.3.6 DMA Contral Circuit T
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I ~ ~ N G.... TCK G....UB G.... TRF
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N I .po. 0\ OMA1 Z GAATCK GAATAB C"
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I .p. 00 2.3.7 Ready Signal Control
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I VI o CPU N READV GAATAB GAATCB GA
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N I VI N , I I 1 51 50 IoI/11l CPU
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N I VI .l)o 2.3.10 ROM Access Circu
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N I VI 0\ 2.3.11 D-RAM Refresh Circ
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N J, 00 2.3.12 RAH Parity Check Cir
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N 2.3.13 Speaker Control Circult o
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N ~ 2.3.14.6 Address A20 Signal Con
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N I C7I ~ 2.3.15 1/0 Slot Access Si
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PRINCIPLES OF OPERATION REV.A 2.4.1
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PRINCIPLES OF OPERATION REV.A Print
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PRINCIPLES OF OPERATION REV .A 2.4.
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PRINCIPLES OF OPERATION REV.A Read
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PRINCIPLES OF OPERATION REV.A Hard
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PRINCIPLES OF OPERATION HEV.A 2.5.4
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PRINCIPLES OF OPERATION REV.A TABLE
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PRINCIPLES OF OPERATION REV.A (2) S
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PRINCIPLES OF OPERATION HEV.A (3) S
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PRINCIPLES OF OPERATION REV.A (1) R
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PRINCIPLES OF OPERATION HEV.A (7) E
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PRINCIPLES OF OPERATION REV.A (13)
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PRINCIPLES OF OPERATION REV.A E05 0
Page 129:
CHAPTER 4 TROUBLESHOOTING TABLE OF
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TROUBLESBOOTIBG REV.A 4.2 TROUBLESH
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TROUBLESBOOn}l; REV.A 3. How to use
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TROUBLESBOOTING HEV.A 4.3.4 Specifi
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t -For 08H (0 is written in each bi
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~ I ~ 0 ~ (Example) When the error
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~ I ~ N 26H or 27H 28H 8254-2 8259A
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.... I ~ ~ 31H or 32H ( 38H) Unfixe
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tI-' 0'1 (3EH) Keyboard Unfixed uni
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ṭ 00 ... (42H) Lithium Unfixed ba
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~ I N o ---------------------------
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CHAPTER 5 DISASSEMBLY AHD ASSEMBLY
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RHV .A DIASSEHBLY AHn ASSEHBLY 5.1
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RKV .A DIASSEMBLY AND ASSEMBLY 5.1.
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REV .A DIASSEKBLY AND ASSEKBLY 5.1.
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REV .A DIASSEMBLY AND ASSEHBLY 5.1.
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REV .A DISASSEMBLY AHn ASSEMBLY 5.1
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RKV .A DISASSEMBLY AND ASSEMBLY 5 .
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REV .A DISASSKMBLY AND ASSKMBLY 5.3
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RKV .A DIASSEMBLY AND ASSEMBLY 5.3.
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CHAPTER 7 DIAGRAMS AHD REFERENCE MA
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REV .A DIAGRAMS AND REFERENCE MATER
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REV.A DIAGRAMS AN» REFERENCE MATER
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REV.A DIAGRAMS AND REFERENCE MATERI
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REV .A DIAGRAMS AHn REFERENCE MATER
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REV.A DIAGRAMS AN» REFERENCE MATER
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REV.A DIAGRAHS AND REFERENCE MATERI
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BEY .A DIAGRAHS AND REFERENCE MATER
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HEV.A DIAGRAMS AND REFERENCE MATERI
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REV .A DIAGRAKS AND REFERENCE MATER
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REV .A DIAGRAMS AN» REFERENCE MATE
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REV.A DIAGRAHS AN» REFERENCE MATER
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REV.A DlAGRAHS AHn REFERENCE MATERI
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REV.A DIAGRAMS AHn REFERENCE MATERI
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HEV.A DIAGRAMS AN» REFERENCE MATER
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REV.A DIAGRAMS ARD REFERENCE MATERI
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REV.A DIAGRAMS ARD REFERENCE MATERI
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HEV.A DIAGRAKS AN» REFERENCE MATER
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REV.A DIAGRAKS AND REFERENCE MATERI
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CHAPTER 8 DIFFERENCE ßETWEEN 10MHz
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0) I I'\) Modification Substitution
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Q) I ~ Modification Unit Descriptio
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~ I m 8.2.2 ANT-RM Board Unit Modif
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00 I 00 8.2.4 ANT-MT Board Unit Mod
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CXl I ~ o 8.3 JUMPER SETTINGS 8.3.1
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CD .... I I\) 8.3.3 SPFG Board Jump
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~ I ~ ~ 8.4 COMPATIBILITY LIST 8.4.
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LIST OF DIAGRAMS UNIT NAME V-CODE A
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1 2 3 4 5 +5 +5 L A B c o E F G H R
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1 2 3 4 5 A B c o E F G H +5 +5 R8
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. 1 2 3 4 5 +5 +5 A B c o E F G H R
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2 3 4 5 6 7 8 CI4 0.1_ r I ~ A B c
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A B c D E F G H T III)IIS I 14 13 1
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2 9 7 4 8 102718 24 23 22 21 17 19
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-----A B C D E F G H T liiCi
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A B c D E F G H T r----------------
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---------1 A B c D 2 4 CN2 CNI AEN
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A B c D E F G H T DISK 11 SENSOR PK
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.5 SAII 10 9 B 7654 AEN SA3 2 1 o -
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231 241 / 230 108 ./ (, 201 100 125
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EPSON Printed in Ja[BIl 88.10-1.5
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