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SECTION I
INTRODUCTION
1.1
GENERAL
The TEl, Inc. FDC-3 Floppy-Disk Controller combines the 1791 LSI
floppy-disk controller device and supporting logic to control up to
eight standard drives and up to three mini drives - single or double-
sided, single or double density.
The 1791 device allows software
selection of both density and number of sides for ease in changing
system conf iguration.
The FDC-3 Floppy-Disk
compatible formats;
automatic track-seek
detection.
Controller also effers such features as IBM-
buffered
control,
data,
and
status
lines,
with verification;
and CRC generation and
The TEl, Inc. FDC-3 Floppy-Disk Controller was specifically designed
to operate reliably in a TEl, Inc. ComFuter System using TEl, Inc.
system components.
Although the FDC-3 Floppy-Disk Controller may work
properly in another manufacturer's computer, or with another
manufacturer's components, TEl, Inc. cannot guarantee that it will do
so.
1.2
PHYSICAL DESCRIPTION
The FDC-3 Controller card (Figure 1-1) consists of 31 integratec
circuits, plus supporting components; 50-pin socket for standard (8")
diskette-drive signal cable; and a 34-pin socket for miniature (5.25")
drive
signal cable;
all mounted on a 5" x 10" (127-mm x 254-mill)
fiberglass double-sided etched-circuit board complete with a standard
S-IOO bus connector that has gold-plated contacts for reliability and
long life.
1-1
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