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RI4
+5
~99
150
+5V
ETCH CUT
PROGRAM SHUNT PINS 7-10 ARE OPENED
/ '
OREDY+
RADIAL
READY
STATUS
TO USER
CONTROLLER
RM
'9
ETCH CUT
~-~~4
~
IREADY -
, - -.........- -
~'3_SE_L_+_. ---~'--o-------'
RR
Figure 1-8
Radial Ready Installation
Note
MC1 through MC4 cannot be used as radial motor control when using this option.
1.19.7
Ready, Modified (RM)
This option allows the drive to write on the upper surface of a single-sided diskette. It prevents the
drive from making Ready become false when the upper surface of a single-sided diskete is selected.
To implement this option, connect a jumper at the RM pads.
1.19.8
Radial Index (RI)
This option uses the alternate I/O lines for radial index lines. This option allows the userto monitor the
index of each drive independent of drive select. This option cannot be used concurrently with radial
ready, or with independent motor control.
Radial Index is implemented by removing the shunt bridge at U3, Pins 6 and 11, by etch cutting radial
index, and by running a wire from U4, Pin 6, to the appropriate alternate I/O lines. If use of MC1 is
desired, interface line 20 may be used as one index line. In this case, the shunt pack, U3, 6-11,
remains intact on one drive, (see Figure 1-9).
1-19
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