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L'502,
SIDE 1-
LAOK
4
Oa
IN1 FF+
Ua
I
IREADY-
DRSEL -I
RR
ETCH CUT
MC1 through MC4 cannot be used as radial motor control when using this option.
1.19.7
Rea d y , M o d ified (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
Ra di a l I n dex (Rl)
This option uses the alternate I/O lines for radial index lines. This option allows the user to 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 u sed as one index line. In this case, the shunt pack, U3, 6-11,
remains intact on one drive, (see Figure 1-9).
DREDv +
R14
4 7 R4
I
4 ..
44
I/i'
tl
II
RA7ilK
~READ
i XM cc
STATUS
TO USER
CONTROLLER
Figure 1-8
Radial Ready Installation
1-19
PROGRAM SHUNT PINS 7-10 ARE OPENED
05
4
IIEA AY ~E
I
%5V
R99
150
Note
M 2~
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