PB400/401T System Overview

Battery

 3.6V DC NiCad soldered on motherboard

BIOS

 128 KB - Phoenix BIOS V1.01.08, 1.01.16 (latest)

Bus Architecture

 ISA based system bus

Cache

 Write Back: 8 KB Internal (Level 1) Cache External (Level 2) 0 - 256 Kb

CPU

 Intel 486 processor

Interfaces

 1 X DB-25F Parallel 1 X RS232,DB-9M Serial 15-pin F VGA PS/2 Mouse PS/2 Keyboard 34-pin on board FDD 40-pin IDE HDD 15 pin Game (only with CL5424 Systems)

IRQ Availability

 00 Timer Click 01 Keyboard 02 Second 8259A 03 COM2 or COM4 04 COM1 or COM3 05 LPT2 or Sound Card (if present) 06 Floppy Disk 07 LPT1 08 Real-Time Clock 09 Redirected IRQ2 10 Sound Card (if present) 11 (reserved) 12 PS/2 Mouse 13 Math Co-processor (if present) 14 Fixed Disk Controller 15 Secondary Fixed Disk Controller (if present)

RAM

 2 MB or 4 MB Standard on Motherboard 6 MB or 18 MB or 20 MB Maximum on Motherboard 4 GB Maximum addressable

Speaker

 Piezoelectric soldered on motherboard

UART Compatability

 Compatible with the 16C450 UART

Video

 Built in Oak Extended VGA controller
 

Network Certification

  
PB400SX-20 (2MB SMT) Workstation
PB400SX-25 (2MB and 4MB SMT) Workstation
PB400SX-33 (4MB SMT) Workstation/Server
PB400DX2-50 (4MB SMT) Workstation/Server
PB400TDX2-50 (4MB SMT) Workstation/Server
 

Note
Motherboards with 2MB soldered DRAM are upgradeable to either 6MB or 18MB depending on the System Controller OPTi chip at U77. This motherboard cannot accept 256K SIMMs. The Video BIOS is built-in on the system BIOS chip and the ver. is on the BIOS chip. There is a second cooling fan for DX2-66 Tower systems. Uses 238 pin type 2 CPU socket.