
Push-Button Reset
E
XTERNAL
S
PEAKER
A miniature 8 ohm speaker can be connected between JS4[29A] and JS4[30A].
This connector is protected with IEC 61000-4-2 (Level 4) rated TVS components to help protect
against ESD damage.
Push-Button Reset
A normally open, momentary action push-button reset switch can be connected between
JS4[19B] and JS4[20B]. Shorting JS4[19B] to ground will cause the
EPM-CPU-10
to reboot.
This connector is protected with IEC 61000-4-2 (Level 4) rated TVS components to help protect
against ESD damage.
Floppy Drive Interface
The
EPM-CPU-10
supports a standard 34-pin PC/AT style floppy disk interface via connector
JS3[JK] and JS3[JL]. Up to two floppy drives can be attached. CMOS Setup can be used to
enable or disable the floppy disk interface.
Note
The floppy drive used to boot the system (Drive A) should be connected after the
twist in the cable, JS3[JK].
Warning!
Cable length must be 18" or less to maintain proper signal integrity. The grounds in
this connector should not be used to carry motor current.
Table 12: Floppy Disk Interface Connector Pinout
JS3
Pin
Signal
Name
Function
JK/JL
Pin
1B
Ground
Ground
1
2B R/LC
Load
Head
2
3B Ground Ground
3
4B NC
No
Connection
4
5B Ground Ground
5
6B NC
No
Connection
6
7B Ground Ground
7
8B INDX*
Beginning Of Track
8
9B Ground Ground
9
10B MTR1*
Motor
Enable
1
10
11B Ground Ground
11
12B
DRV0*
Drive Select 0
12
13B Ground Ground
13
14B
DRE1*
Drive Select 1
14
15B Ground Ground
15
16B MTR0*
Motor
Enable
0
16
17B Ground Ground
17
18B DIR
Direction
Select 18
19B Ground Ground
19
20B STEP*
Motor
Step
20
21B Ground Ground
21
22B
WDAT*
Write Data Strobe
22
23B Ground Ground
23
24B WGAT* Write
Enable
24
25B Ground Ground
25
26B TRK0*
Track
0
Indicator 26
27B Ground Ground
27
28B WPRT* Write
Protect
28
29B Ground Ground
29
30B RDAT*
Read
Data
30
31B Ground Ground
31
32B HDSL
Head
Select
32
33B Ground Ground
33
34B
DCHG
Drive Door Open 34
30 – Reference
EPM-CPU-10 Reference Manual