Service manual

Service Manual
Keyswitch mapping (cont.)
Key
Size
Key
Name
Row
code
Col.
code
Notes
2.25
shift
4
C
1,3
1
Z
4
E
1
X
4
F
1
C
5
0
1
V
5
1
1
B
5
2
1
N
5
3
1
M
5
4
1
,<
5
5
1
.>
5
6
1
/
5
7
2.75
shift
5
8
1,3
1
crsrUp
5
9
1
1
1
5
A
1
2
5
B
1
3
5
C
1.5
Caps
5
D
1,4
1.5
Alt
5
E
1,3
7.0
Space
5
F
1.5
Alt
6
0
1,3
1.5
Ctrl
6
1
1,3
1
crsrLt
6
2
1
1
crsrDn
6
3
1
1
crsrRt
6
4
1
2.0
0
6
5
1
.
6
6
2.0
Enter
6
7
1
Row and column codes are in hexadecimal.
Notes:
1 Key colour - dark grey.
2 Key colour - dark grey.
3 Key position with N key rollover.
4 Green LED under key cap.
Floppy disc drive
The floppy disc drive used on the workstations (except
discless) is a one-inch high drive, taking 3.5 inch double-
sided double-density floppy discs.
Performance
Capacity
1 MB (unformatted)
Track to track step rate
Seek settle time
Write to read timing
Power-on to drive ready
Power supply
Maximum power
3ms
15ms
1200µs
1000ms
+5Vdc (+/– 5%)
2 Watts (continuous)
Power connector
The power connector is a 4-pin, 2.5mm pitch type.
Pin
Signal
1
+5V
2
0V
3
0V
4
+12V
Interface connector
The interface connector is a 34-way, 2 row, 0.1 inch pitch
type, with pinouts as shown below:
Pin
Signal
Dir
main (PCB)
Retn
Signal
1
2
Disc change
I
3
4
In use
I
5*
6
Drive select 3
0
7*
8
Index
I
9*
10
Drive select 0
0
11*
12
Drive select 1
0
13
14
Drive select 2
0
15
16
Motor ON
0
17
18
Direction
0
19
20
Step/Disc chg rst
0
21
22
Write data
0
23
24
Write gate
0
25
26
Track 0
I
27
28
Write protect
I
29
30
Read data
I
31
32
Side 1 select
0
33
34
Ready
I
*Optionally +5V I = Input 0 = Output
1-14 Issue 2, June 1991 Part 1 - System description