Kontron MSM800BEV - Manual (Page 44)

MSM800BEV / Detailed System Description
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6.8.4 Floppy Disk Interface
The onboard floppy disk controller and ROM-BIOS support one or two floppy disk drives in any of the standard PC-DOS
and MS-DOS formats shown in the table.
Supported Floppy Formats:
Capacity Drive Size Tracks Data Rate DOS Version
1.2MB 5¼" 80 500KHz 3.0 - 6.22
720K 3½" 80 250KHz 3.2 - 6.22
1.44M 3½" 80 500KHz 3.3 - 6.22
Floppy Interface Configuration
The desired configuration of floppy drives (number and type) must be properly initialized in the board's CMOS -
configuration memory. This is generally done by using DEL or F2 at boot up time.
Floppy Interface Connector
The table shows the pin-out and signal definitions of the board's floppy disk interface connector. It is identical in pin-
out to the floppy connector of a standard AT. Note that, as in a standard PC or AT, both floppy drives are jumpered to
the same drive select: as the 'second' drive. The drives are uniquely selected as a result of a swapping of a group of
seven wires (conductors 10-16) that must be in the cable between the two drives. The seven-wire swap goes between
the computer board and drive 'A'; the wires to drive 'B' are unswapped (or swapped a second time). The 26pin high
density (1mm pitch FCC) connector has only one drive and motor select. The onboard jumper defines the drive A: or
B:. Default is always A:.
Floppy Disk Interface Technology
Only CMOS drives are supported. This means the termination resistors are 1K Ohm and 5¼" drives are not
recommended (TTL interface).
The 26pin connector: FFC/FPC 0.3mm thick 1.0mm (0.039") pitch (MOLEX 52030 Series)
Floppy Disk Interface Connector:
FD26: Pin Signal Function in/out
1 VCC +5Volt
2 IDX Index pulse in
3 VCC +5Volt
4 DS2 Drive select 2 out
5 VCC +5Volt
6 DCHG Disk change in
10 M02 Motor on 2 out
12 DIRC Direction select out
14 STEP Step out
16 WD Write data out
17 GND Signal ground
18 WE Write enable out
19 GND Signal ground
20 TRKO Track 0 in
21 GND Signal grounds
22 WP Write protect in
23 GND Signal ground
24 RDD Read data in
25 GND Signal ground
26 HS Head select out