Tandon TM100-1, Operating And Service Manual, Page: 20 / 105

DUST COVER
The design of an enclosure should incorporate a
means to prevent contamination from loose
items, e.g., dust, lint, and paper chad, since the
drive does not have a dust cover.
COOLING
Heat dissipation from a single drive is normally
15 watts, 51 BTU per hour, under high load con­
ditions. When the drive is mounted so the compo­
nents have access to a free flow of air, normal
convection cooling allows operation within the
specified temperature range.
When the drive is mounted in a confined envi­
ronment, air flow must be provided to maintain
specified air temperatures in the vicinity of the
motors, printed circuit board, and diskettes.
When forced air is used, air flow must be direct­
ed outward from the drive. Do not intake air
through the drive or heads and diskettes.
3.4 INTERFACE CONNECTIONS
Interface connections for the TM100-1 and
TM100-2 are made via a user-supplied, thirty-
four pin, flat ribbon connector, 3M Part Number
3463-0001 or Amp Part Number 583717-5, using
contact Part Number 1-583616-1 for twisted
pair or its equivalent. This connector mates
directly with the circuit board connector at the
rear of the drive. The D. C. power connector is a
four-pin connector at the rear of the drive. The
interface description of the connectors, and the
location of each one, is contained in this section.
Interface lines are located in Table 3-1. D. C.
power connector pin assignments are located in
Table 3-2.
The signal wire harness should be of the flat
ribbon or twisted pair type, 26-to-28 gauge
conductor, compatible with the connector to be
used. The recommended cable length is ten feet
maximum.
TABLE 3-1
DRIVE INTERFACE LINES
AND PIN ASSIGNMENTS
Input Control Lines:
Controller-To-Disk Drive
Ground
Pin Signal
1 2 Connector Clamp
3 4 Spare
5 6 Drive Select 3
9 10 Drive Select 0
11 12
Drive Select 1
13 14 Drive Select 2
15 16 Motor On
17
18 Direction Select
19 20
Step
21 22
Composite Write Data
23 24
Write Enable
31 32
Side Select
Output Control Lines:
Disk Drive-To-Controller
Ground Pin
Signal
7 8 Index/Sector
25 26 Track 0
27
28 Write Protect
29
30
Composite Read Data
33 34 Spare
INPUT CONTROL LINES
DRIVE SELECT LINES
The Drive Select lines provide a means of select­
ing and deselecting a drive. These four lines
select one of the four drives attached to the
controller.
When the signal logic level is true (low), the
drive electronics are activated, and the drive is
conditioned to respond to Step or Read/Write
commands. A Drive Select line must remain
stable in the true (low) state until a Step or
3-2