Physical Characteristics; Electrical Characteristics; Module Address - Texas Instruments 990 Maintenance Manual

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945407-9701
1.3 PHYSICAL CHARACTERISTICS
The 16 Input/16 Output TTL Data Module is implemented on a double-edge, half-size printed
circuit board that can be inserted into any CRU slot of any Model 990 Computer chassis or
CRU expansion chassis. It is a double-sided board that measures 7.00 inches by 10.80 inches
high, as oriented in figure 1-1. The board is made to be inserted into an 80 contact printed
circuit board slot connector located in the backpanel of the chassis (see table 1-1 for the pin
assignments). The generalized TTL interface is supplied to external devices through a 40-pin flat
cable connector on the rear of the card. The pin assignments for this connector are shown in
table 1-2.
i .4 ELECTRiCAL CHARACTERiSTiCS
Table 1-3 lists the logic levels and electrical requirements for the 16 Input/16 Output TTL Data
Module.
1.5 MODULE ADDRESS
The location of the module within the computer chassis (or expansion chassis) determines the
CRU base address that the module recognizes. Therefore, before selecting a chassis location,
determine the address that the software handling routine expects the module to recognize.
Table 1-1. CRU Interface Pin Assignment
Pin Number Signal Name
Pl-14 TLIORES
Pl-18 CRUBITOUT
Pl-22 STORECLK
Pl-32 CRUBIT13
Pl-34
CRUBIT15
Pl-36 CRUBIT12
Pl-38
CRUBIT14
Pl-48 IMODSELA
Pl-60
CRUBITIN
Pl-66 INTERRUPT A
Pl-1,2,24,79,80
GROUND
Pl-3,4,77,78 +5 Volts
Table 1-2. External Connector Pin Assignment
Pin Number
P2-2
P2-3
P24
P2-5
P2-6
P2-7
P2-8
1-5
Signal Name
OUTO-
OUTI-
OUT2-
0UT3-
OUT4-
0UT5-
OUT6-
Digital Systems Division