PB410/420 Motherboard Layout

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PB410/420 Motherboard Layout

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U45 Upgrade Socket (DX, DX2, SX, SX2, ODP)

Uses 237 pin type 3 socket Zero Insertion Force (ZIF) socket. No special tools are required to upgrade the CPU with an Intel Overdrive Processor.

J1 PS/2 Keyboard Port

J1 is a female 6-pin mini DIN connector built-in on the motherboard.

J2 PS/2 Mouse Port

J2 is a female 6-pin mini DIN connector built-in on the motherboard.

J3 VGA Port

 
J3 is a 15-pin DB15 port built-in on the motherboard.

J4 Game Port

 
J4 is a female DB15 port built in on the motherboard.

J5 Parallel Port

 
J5 is a female DB25 parallel port built-in on the motherboard.
 

J6 Serial Port

 
J6 is a male DB9 serial port built-in on the motherboard.
 

U17,U24,U26,U30,U32 Cache Upgrade Sockets

 
32KB, 128KB or 512KB cache supported.
 
 
See Also
 
Cache Upgrade Table
Cache Upgrade Information
 

SIMM Socket (BANK 1/BANK 2)

 
Use a 72 pin SIMM.
 
 
 
Also See
 
Ram Upgrade Information
 

BANK 0 4 MB soldered RAM

 
(Not on all systems.)
 

J12 (JVD) Color/Monochrome Select

Default

J14 (JAUDIO) Reserved

This connector is unused on this motherboard.

J15 (JGAME) Game Port Enable/Disable

Enabled

Disabled

Default

J16 (JI/O) On-board I/O Controller Enable/Disable

Enabled

 

Disabled

Default

J17 (JBOOT) BIOS Boot Block Select

Normal

"Boot from Boot Block"

Default

J13 (JIRQ5/7) LPT1 IRQ Select

IRQ 7

IRQ 5

Default

J11 (JVGAS) VGA Enable/Disable

Built in VGA Enabled

Built in VGA Disabled

Default

J29 (JCAHS) CPU Speed

33mhz

33mhz

Default

Note
If external cache is installed and computer is in de-turbo mode, having J29 closed will result in an irregular speed greater than 8 Mhz.
 

J30,31,32,33 (JCACH) CACHE Size Selection

Note:
J30,31,32, 33 are ignored if no external cache is installed.
 

Default

See Also
Cache Upgrade Information
 

J28 (JBT) External Battery Connector

J24 (JB8S) On-Board Battery Enable/Disable

Enabled

Disabled

Default

J36 Front Panel Connector



J37 (JKLK) Keylock Connector



J38 (JSPK) External Speaker Connector



J39 (JSPKS) On-Board Speaker

Enabled

Disabled

Default

J35 (JFAN): External Fan Connector



BZ1 Internal Buzzer

 
Internal Piezoelectric Buzzer (soldered).
 

BT1 Internal Battery

 
Internal 3.6V DC NiCad battery (soldered).
 

J10 (JVESA) VGA Feature Connector 2 x 13 Pin Header



J19 (JFDC) Floppy Drive Connector

 
2 x 17 Pin Header.
 

J18 (JHDD) Hard Drive (IDE) Connector

 
2 x 20 Pin Header.
 

J21 (JMOD) Proprietary Modem Connector

 
2 x 10 Pin Header.
 

U29 HT-216-32

 
Headland Technologies VGA Controller.
 

U22 256K x 16 Surface mount

 
Video Memory (Second 512K).
Not on all systems
 

U23 256K x 16 Surface mount

 
Video Memory (First 512K).
 

U47 486SX/DX

 
Main Processor (soldered if included).
 

U14, 16 Video Memory Traces

 
 
 

U48 ACC2168

 
System Chipset Controller.
 

U7 IMSG176J-66Z RAMDAC

 
Video support chip.
 

U15 ACC3221 Super Multi I/O

 
HD, FD, serial and parallel port controller.
 

U1 8242

 
Keyboard Controller.
 

U25 BIOS

 
128 Kb Phoenix BIOS
Phoenix 1.01.14E, 1.01.17E, 1.01.20E, 1.01.24E (Latest).
 

J34, J40 CPU Type (Motherboard Revision 'C' Only!)

 
 
 
See Also PB410 CPU Upgrade
Uses 237 pin type 3 socket

J22 (JIRQ9) Video IRQ9 Enable

Disabled

Enabled

 

Default J27 (JMRQ) Mouse Port

Enabled

Disabled


Default J23,25,26 (JSEL) CPU Speed Select

See Also
PB410 CPU Upgrade
 

U20 Zip Video Memory Socket

 
Video memory is upgraded by installing a 256KBx16 70ns or 80ns DRAM ZIP at location U20. The ZIP needs to be ASYMMETRICAL (Write Enabled).
 
If the Motherboard had a DRAM chip at location (U22) the motherboard has 1M installed. If there is not a chip at Location (U22), insert a 256KBx16 ZIP at location (U20) to upgrade the video memory to 1MB.
 
 
See Also PB410 Video Memory Upgrade