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I/O CONNECTOR
Table 1. I/O Connector Signals
Pin
Signal Name
Description
1
GND
Signal Ground
2
GND
Signal Ground
3
D0
CPU Data Bit 0
4
D1
CPU Data Bit 1
5
D2
CPU Data Bit 2
6
D3
CPU Data Bit 3
7
D4
CPU Data Bit 4
8
D5
CPU Data Bit 5
9
D6
CPU Data Bit 6
10
D7
CPU Data Bit 7
11
R/W
CPU Read/Write Signal
12
A0
CPU Address Bit 0
13
A1
CPU Address Bit 1
14
A2
CPU Address Bit 2
15
A3
CPU Address Bit 3
16
A4
CPU Address Bit 4
17
A5
CPU Address Bit 5
18
A6
CPU Address Bit 6
19
A7
CPU Address Bit 7
20
A8
CPU Address Bit 8
21
A9
CPU Address Bit 9
22
A10
CPU Address Bit 10
23
A11
CPU Address Bit 11
24
A12
CPU Address Bit 12
25
A13
CPU Address Bit 13
26
A14
CPU Address Bit 14
27
A15
CPU Address Bit 15
28
E
Main CPU Clock (0.89 MHz)
29
SEL
Input to Disable Device Selection
30
RESET
Main Reset and Power-up Clear Signal to
the System
31
NMI
Non-Maskable Interrupt to the CPU
32
+5v
+5 volts (250 mA)
33
GND
Signal Ground
34
GND
Signal Ground
external memory modules or ROM software
modules. Table 1 provides a complete list of the
signals and a brief description of each.
In addition to serial interfaces, the MC-10 also
provides a full complement of CPU bus signals
that are accessible at the 34-pin cartridge con-
nector. This allows expansion of the MC-10 with
Содержание TRS-80
Страница 3: ...3 SECTION I SYSTEM DESCRIPTION...
Страница 5: ...5 SYSTEM BLOCK DIAGRAM...
Страница 7: ...7 SECTION II SPECIFICATIONS...
Страница 9: ...9 SECTION III DISASSEMBLY REASSEMBLY...
Страница 11: ...11 SECTION IV THEORY OF OPERATION...
Страница 21: ...21 SECTION V TROUBLESHOOTING...
Страница 25: ...25 SECTION VI PARTS LIST...
Страница 30: ...30 SECTION VII PRINTED CIRCUIT BOARDS...
Страница 31: ...31 MAIN P C B TOP VIEW...
Страница 32: ...32 BOTTOM VIEW...
Страница 33: ...33 SECTION VIII IC INTERNAL CONNECTIONS...
Страница 34: ...34 IC INTERNAL CONNECTIONS U1 MC6803G Motorola or HD6803P Hitachi...
Страница 35: ...35 U11 MC6847P Motorola...
Страница 36: ...36 U2 SN74LS373N Motorola or MB74LS373M Fujitsu U7 SN74LS245N Motorola or MB74LS245M Fujitsu...
Страница 37: ...37 U3 MB8364M Fujitsu U9 10 PD4016C 1 NEC or PD4016D 1 NEC or MB8128 15P Fujitsu or MSM2128 20RS Oki...
Страница 41: ...41 U15 LM339N Motorola or PC339C NEC U18 SN74LS74AN Motorola or MB74LS74AM Fujitsu or HD74LS74AP Hitachi...
Страница 42: ...42 U16 MC1741CP1 Motorola or HA17741PS Hitachi U17 MC7805CT Motorola or NJM7805A JRC or PC7805H NEC...
Страница 43: ...43 SECTION IX SCHEMATlC DlAGRAM SECTION X EXPLODED VlEW...