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PB 386 25 Rev. F Motherboard Layout

Sockets
Jumpers
Connectors

PB 386 25 Rev. F Sockets

Socket

Chip

Description
U4 82510
U23 DS1287 REAL TIME CLOCK BATTERY
U29 458195
U30 8237A
U31 8237A
U32 82C59A
U39 80386 CPU
U41 80387 Math Co-Processor
U44 82C54
U45 82C59
U52 201085-101
U60 505129-001 BIOS (Even)
U62 201086-101
U79 505130-001 BIOS (Odd)
U83 201084-101

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PB 386 25 Rev. F Jumpers

Note
Indicates default settings.
 

SIMM Speed

E47-E48 100ns
E48-E49 85ns

SIMM Type

 E42-E43 Static-column
E44-E45
E42-E43 Fast paged
E45-E46
E41-E42 Standard
E44-E45 RAS/CAS

Total RAM

 E35-E36,E30-E31 1MB
E33-E34,E39-E40
E32-E33,E35-E36 2MB
E39-E40,E30-E31
E33-E34,E36-E37 4MB
E38-E39,E29-E30
E32-E33,E36-E37 8MB
E38-E39,E29-E30

ROM Size

E23-E24 64K
E24-E25 128K

Monitor Type

 E18-E19 Color
E17-E18 Monochrome

Printer

E2-E3 Leading edge

Acknowledge

 E3-E4 Trailing edge

Parallel Port

E5-E6 LPT1 Enabled
E6-E7 LPT1 Disabled
E8-E9 LPT2 Enabled
E9-E10 LPT2 Disabled

Serial Port

E11-E12 COM1 Enabled

Selection

 E12-E13 COM1 Disabled
E14-E15 COM2 Enabled
E15-E16 COM2 Disabled

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PB 386 25 Rev. F Connectors

Note
J6 is a 25-pin version of J5 serial 2. Either connector may be used, but not both.
 

J2

25-Pin Parallel Port

Pin 1= Pin 1 on DB25 Pin 2= Pin 14 on DB25
Pin 3= Pin 2 on DB25 Pin 4= Pin 15 on DB25
Pin 5= Pin 3 on DB25 Pin 6= Pin 16 on DB25
Pin 7= Pin 4 on DB25 Pin 8= Pin 17 on DB25
Pin 9= Pin 5 on DB25 Pin 10= Pin 18 on DB25
Pin 11= Pin 6 on DB25 Pin 12= Pin 19 on DB25
Pin 13= Pin 7 on DB25 Pin NC= Pin 20 on DB25
Pin 15= Pin 8 on DB25 Pin 14= Pin 21 on DB25
Pin 17= Pin 9 on DB25 Pin 16= Pin 22 on DB25
Pin 19= Pin 10 on DB25 Pin 18= Pin 23 on DB25
Pin 21= Pin 11 on DB25 Pin 22= Pin 24 on DB25
Pin 23= Pin 12 on DB25 Pin 24= Pin 25 on DB25
Pin 25= Pin 13 on DB25 Pin 26= Pin NC on DB25

J5

2 9-Pin Serial Ports

Serial 1 (COM1) Serial 2 (COM2)
Pin 1= Pin 1 on DB9 Pin 10= Pin 1 on DB9
Pin 2= Pin 6 on DB9 Pin 11= Pin 6 on DB9
Pin 3= Pin 2 on DB9 Pin 12= Pin 2 on DB9
Pin 4= Pin 7 on DB9 Pin 13= Pin 7 on DB9
Pin 5= Pin 3 on DB9 Pin 14= Pin 3 on DB9
Pin 6= Pin 8 on DB9 Pin 15= Pin 8 on DB9
Pin 7= Pin 4 on DB9 Pin 16= Pin 4 on DB9
Pin 8= Pin 9 on DB9 Pin 17= Pin 9 on DB9
Pin 9= Pin 5 on DB9 Pin 18= Pin 5 on DB9
Pin 23= Pin - on DB9 Pin 23= Pin - on DB9
Pin 24= Pin - on DB9 Pin 24= Pin - on DB9

J6

25-Pin Serial Port (COM2)

Pin 1= Pin - on DB25 Pin 13= Pin 7 on DB25
Pin 3= Pin 2 on DB25 Pin 14= Pin 20 on DB25
Pin 5= Pin 3 on DB25 Pin 15= Pin - on DB25
Pin 7= Pin 4 on DB25 Pin 18= Pin 22 on DB25
Pin 9= Pin 5 on DB25 Pin 24= Pin 25 on DB25
Pin 11= Pin 6 on DB25

J1

Keyboard Connector

J15

Power Supply (PS1/2)

J20

Power Out

J23

Reset, Speaker, Keylock

 
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