Hs - Head Select Option; Hm - Head Motor Option; Single-Drive Conflguration; Multiple-Drive Configuration - Siemens Microfloppy FDD100-5 Operating And Maintenance Manual

2.5.1 HS - HEAD SELECT OPTION
The Head Select option causes the head of the disk drive to load when the Drive Select signal is
received. The program shunt is installed so that the HS position is short circuited (see Figure
2·12A). The HS position can be used in either single-drive or multiple-drive configuration.
2.5.2 HM - HEAD MOTOR OPTION
The Head Motor option causes the head of the disk drive to load when the Motor On signal is
received. The program shunt is installed so that the HM position is short circuited (see Figure
2-128). The HM position can be used in either single-drive or multiple-drive configuration.
2.5.3 SINGLE-DRIVE CONFIGURATION
With a single-drive configuration, the program shunt need not be altered in any way except to
select either the HS or HM positions. Any Drive Select signal will activate the Select Light and load
the head if HS is programmed.
2.5.4 MULTIPLE-DRIVE COI\IFIGURATION
With a multiple-drive configuration, the MX (Multiplex) position and two of the three DS (Drive
Select) positions must be cut (see Figure 2-128). The shunt positions can be cut by using AMP
special tool, PIN 435705, or by bending the leg of the program shunt away from the socket before
installation to provide the necessary open-circuit condition.
2.6 OPTIONS
The Model F DD1 00-5 Disk Drive can be modified by the customer to operate by other than the
standard methods described in subsection 2.5. The modifications can be made by connecting option
pads or cutting jumpers, or by using the optional interface lines at J 1 connector pins 2, 4, 6, 32, and
34, or be altering the program shunt module. Available options are listed and described in Table 2-2.
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