User manual

DIGITAL-LOGIC AG MSM800SEV/SEL/BEV/XEV/XEL Detailed Manual V1.7
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Floppy Disk Interface Technology
Only CMOS drives are supported. This means the termination resistors are 1 KOhm and 5 1/4“-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 Name 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 grounds
18 WE Write Enable out
19 GND Signal grounds
20 TRKO Track 0 in
21 GND Signal grounds
22 WP Write Protect in
23 GND Signal grounds
24 RDD Read Data in
25 GND Signal grounds
26 HS Head Select out
5.4.5. Speaker Interface
One of the board's CPU devices provides the logic for a PC compatible speaker port. The speaker logic
signal is buffered by a transistor amplifier, and provides approximately 0.1Watt of audio power to an external
8 ohm speaker. Connect the speaker between VCC and speaker output to have no quiescent current.