SYSTEM TECHNICAL MANUAL
HARDWARE DESCRIPTION
Capacity (double-sided, double density)
unformatted
500 Kbytes
Formatted (CP/M)
320 Kbytes
Formatted (MS-DOS)
360 Kbytes
Tracks per inch
48
Tracks per disk side
40
Sectors per track (CP/M)
8
Sectors per track (MS-DOS) 9
Bytes per sector
512
M otor start time
<40 0 msec
Head movement (track to track)
< 6 msec
Data transfer tim e 250 bits/sec
Figure 2.17 Technical data
The flexible disk drives use the standard pin assignments as
shown in Figure 2.18.
R EADY/ 34
33
GRD
SIDE SE L/
32
31
GRD
R D D A T A / 30 29
GRD
WRPROT/ 28 27
GRD
TR A C K0/
26
25 GRD
WREN /
24
23
GRD
W R D A T A / 22 21
GRD
STEP/ 20 19
GRD
D IR / 18
17
GRD
MOTO RON/ 16 15
GRD
14
13
GRD
SE L1/ 12
11
GRD
SE L0/ 10 9
GRD
IN D E X /
8
7
GRD
6 5
GRD
4
3
GRD
H D LO A D /
2 1
GRD
Figure 2.18 Pin assignments
The input and output signals to the disk drive are standard,
industry-compatible signals. These signals are:
Drive Select (0.1.2.3)
Active low input signal to select one of four FDD. Drive Se
lect active turns the motor on, loads the heads, and turns on
the front panel LED of the selected drive.
2-25
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