Speaker Interface - DIGITAL-LOGIC MSM800SEV/SEL Technical User's Manual

DIGITAL-LOGIC AG
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:
Floppy Disk Interface Connector:
FD26: Pin Signal Name
1 VCC
2 IDX
3 VCC
4 DS2
5 VCC
6 DCHG
10 M02
12 DIRC
14 STEP
16 WD
17 GND
18 WE
19 GND
20 TRKO
21 GND
22 WP
23 GND
24 RDD
25 GND
26 HS
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.
FFC/FPC 0.3mm thick 1.0mm (0.039") pitch (MOLEX 52030 Series)
Function
+5Volt
Index Pulse
+5Volt
Drive Select 2
+5Volt
Disk Change
Motor On 2
Direction Select
Step
Write Data
Signal grounds
Write Enable
Signal grounds
Track 0
Signal grounds
Write Protect
Signal grounds
Read Data
Signal grounds
Head Select
MSM800SEV/SEL/BEV/XEV/XEL Detailed Manual V1.7
in/out
in
out
in
out
out
out
out
out
in
in
in
out
50