Mitsubishi Electric Apricot LS Pro, Hardware Technical Reference

Page: 59 / 142

System Board
Contents
Chapter 1
Chapter 2
Chapter 3
Chapter 5
Chapter 6
Chapter 3
3/22 LS PRO HARDWARE TECHNICAL REFERENCE
Power connector
Pin Function
1 +12 Volts
2 ground (for +12V)
3 ground (for +5V)
4 +5 Volts
Floppy drive connector
Pin Function Pin Function
2 density select 1 14 drive select 2
3 not connected 16 motor on
4 not connected 18 direction
5 5V 20 step
6 density select 0 22 write data
7 5V 24 write enable
8 index 26 track 00
9 5V 28 write protect
10 drive select 0 30 read data
11 5V 32 head select
12 drive select 1 34 disk change
Note
All other pins are connected to 0 Volts.
2
1
34
33
System board power connector
Pin Function
1 +12V
2 +12V
3 +5V
4 +5V
5 0V
6 0V
7 0V
8 0V
9 -12V
10 Power good
Battery jumper
A two position jumper is provided alongside the system board battery. With the
jumper in the position away from the power supply metalwork the battery provides
power to the system board maintaining the contents of CMOS RAM and powering the
Real time clock when mains power is not available.
If the jumper is moved to the position nearest the power supply metalwork battery
power to the system board is disconnected, and the CMOS RAM is discharged.
The jumper is identified in the illustration on page 2/5, and instructions on accessing
the system board are given in section 2.
1 2 3 4
1
6 10
5