Canon AS-100M Field Service Manual page 20

FDD Controller also drives the
line; therefore, 5" FDD incorporates an interface circuit con­
sisting of VFO circuit, condition generator circuit, bus driver/
receiver circuit for common application of one same bus.
Power supply is provided from main unit separately from signal
bus.
8
1.2.6 ' ! FDD
Except for the following,
(MDD220 x 2).
Drive
Interface circuit VFO circuit
Power source
1.2.7 PRINTER
Refer to PRINTER TECHNICAL GUIDE.
1.2.8 I/O MOTHER (option)
The I/O MOTHER is for optional interface and devices to be connected
to I/O bus.
use and a 3-port (0PT2, 0PT3, 0PT4) for optional interface addressed
in I/O memory area.
The following optional device and interface are connected to I/O
MOTHER.
o System memory area (90000H - A7FFFH) ... Option use
o I/O memory area
I/O memory area is normally allocated to meet the respective port
select and status read, for optional interface-use by three ports.
8
" FDD is the same as 5" FDD
YD-180 x 2 (daisy chain)
Built-in
I/O mother keeps a 96KB system memory area for optional
8
" FDD (YD-180 x 2) with same bus
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