Epson TM-T88II Series Manual de Instruções Página 60

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Rev. A Mechanisms and Operation 2-21
TM-T88 Series Technical Manual
RAM (1M bit)
RAM is used for temporary storage of the following:
Data received from the interface (receive buffer)
Pattern data printed by the print head unit (printer buffer)
Data used for CPU (U4) routines (flags, pointers, etc.)
64
65
66
67
68
A23
A22
A21
A20
A19
A23
A22
A21
A20
A19
Address bus. Not used. Open
Address (A19 to A323)
OTTL
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
A18
A17
A16
A15
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
A18
A17
A16
A15
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
Address bus O TTL
88 RD
RD External data read signal O TTL
89 WR
WR External data write signal O TTL
90 P52 Not used. Open I TTL
91 P53 Not used. Open I TTL
92 P54 Not used. Open I TTL
93 P55 Not used. Open I TTL
94 CSO CSO Gate array select signal; L: ON O TTL
95 VCC VCC Main power supply terminal (+5V) I (+5V)
96 CS1 CS1 RAM chip select signal; L: ON O TTL
97 CS2 CS2 ROM (U6) chip select signal; L: ON O TTL
98 CS3 CS3 ROM (UN10) chip select signal; L: ON O TTL
99 RAS RAS Not used. Open O TTL
100 GND GND GND terminal I (0V)
CPU signal assignments and functions (continued)
No. Pin name Signal name Function I/O Level
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