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(4) INDICATOR
OSC SEL (Four LEDs in the left of the board)
. . . . . . . . . . • . . . '. They indicate the selected
position on the OSC SEL switch.
IfF signals
(Five LEDs in the middle of the
board) . . . . . . . . . . They indicate at the states
of TRK 00, WRTPRT, RDY, DSKCHG, and
INDEX, respectively.
The TRK 00, WRTPRT, ROY, and DSKCHG
indicators are lit when the respective IfF sig-
nals are low (true).
The INDEX indicator
blinks when the INDEX signal is applied to
the board.
TRACK POSITION (Seven segment LED indi-
cator in the right of the board) •..
~
....•.••
Indicates the current track position.
(5) Test Points
TP-I;
"M;:::O';;:T:AO-;:::R-'O""N~
TP-2; WRT GATE
TP-3;
RD DATA
TP-5; INDEX
TP-6; STEP
TP-7;
;';H-;:::D:-L~O="A-:-D;::'
The GND terminal:
is
marked by "GND".
MFD Checker II Block Diagram
-10-"
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