Hardware Description
SYS68K/CPU-30 R4 Technical Reference Manual
Page 70
3.10.4 Rotary Switches
at PI/T #1
PA0-PA7 lines:
There are two rotary switches installed on the front panel of the CPU
board. The position of each switch can be read in via port A of PI/T #1.
Each rotary switch provides four bits of data. Therefore, each switch has
16 possible positions and the value printed on the switch (i.e., 0-9 and
A-F) can be read from the lines PA0-PA3 (SW1) and PA4-PA7 (SW2) of
PI/T #1.
The following table lists the input signals of PI/T #1 in relation to the
rotary switch signals.
1. reserved
H1
H2
H3
H4
User I/O via optional B5 or optional 5-row VME P2 connector
"
"
"
I
I/O
I
I/O
PB0
PB1
PB2
PB3
1)
PB5
PB6
PB7
Floppy Disk Drive Control
"
"
"
"
"
DMA Controller Control
"
O
O
O
I
I
O
O
O
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
User I/O via optional B5 or optional 5-row VME P2 connector
"
Not Used, Reserved
Timer Interrupt Request
User I/O via optional B5 or optional 5-row VME P2 connector
Port Interrupt Request
68882 FPCP Sense
User I/O via optional B5 or optional 5-row VME P2 connector
I/O
I/O
-
O
I/O
O
I
I/O
Table 26: Rotary Switch Signals Assignment
Port A Bit
Switch
Bit
A0
"1"
0
A1
"1"
1
A2
"1"
2
A3
"1"
3
A4
"2"
0
A5
"2"
1
A6
"2"
2
Table 25: PI/T #1 Interface Signals (Continued)
Pin
Function
In/Out
Содержание SYS68K/CPU-30 R4
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Страница 145: ...VMEPROM SYS68K CPU 30 R4 Technical Reference Manual Page 132...
Страница 189: ...Appendix to VMEPROM SYS68K CPU 30 R4 Technical Reference Manual Page 176...