2 Troubleshooting Procedures

Code Beeps POST Routine Description

14h

 

Initialize keyboard controller

16h1-2-2-3

BIOS ROM checksum

17h

 

Initialize cache before memory autosize

18h

 

8254 timer initialization

1Ah

 

8237 DMA controller initialization

1Ch

 

Reset Programmable Interrupt Controller

20h1-3-1-1

Test DRAM refresh

22h1-3-1-3

Test 8742 Keyboard Controller

24h

 

Set ES segment register to 4 GB

26h

 

Enable A20 line

28h

 

Autosize DRAM

29h

 

Initialize POST Memory Manager

2Ah

 

Clear 512 KB base RAM

2Ch1-3-4-1

RAM failure on address line xxxx*

2Eh1-3-4-3

RAM failure on data bits xxxx* of low byte of memory bus

2Fh

 

Enable cache before system BIOS shadow

30h1-4-1-1

RAM failure on data bits xxxx* of high byte of memory bus

32h

 

Test CPU bus-clock frequency

33h

 

Initialize Phoenix Dispatch Manager

36h

 

Warm start shut down

38h

 

Shadow system BIOS ROM

3Ah

 

Autosize cache

3Ch

 

Advanced configuration of chipset registers

3Dh

 

Load alternate registers with CMOS values

42h

 

Initialize interrupt vectors

45h

 

POST device initialization

46h2-1-2-3

Check ROM copyright notice

48h

 

Check video configuration against CMOS

49h

 

Initialize PCI bus and devices

4Ah

 

Initialize all video adapters in system

4Bh

 

QuietBoot start (optional)

4Ch

 

Shadow video BIOS ROM

4Eh

 

Display BIOS copyright notice

50h

 

Display CPU type and speed

51h

 

Initialize EISA board

52h

 

Test keyboard

54h

 

Set key click if enabled

58h2-2-3-1

Test for unexpected interrupts

59h

 

Initialize POST display service

5Ah

 

Display prompt "Press F2 to enter SETUP"

5Bh

 

Disable CPU cache

5Ch

 

Test RAM between 512 and 640 KB

60h

 

Test extended memory

62h

Test extended memory address lines

64h

Jump to UserPatch1

Satellite M300 and Satellite Pro M300 Maintenance Manual (960-Q08)

￿￿￿￿￿￿ 17

Page 61
Image 61
Toshiba M300 manual Troubleshooting Procedures

M300 specifications

The Toshiba M300 is a notable laptop in the realm of personal computing, renowned for its blend of performance, portability, and versatility. Designed to cater to both professionals and casual users, the M300 incorporates a range of features that set it apart from competitors in its segment.

One of the standout characteristics of the Toshiba M300 is its display, which typically features a 15.6-inch diagonal screen. This size strikes an ideal balance between being compact enough for easy transportation and large enough to provide a comfortable viewing experience. The LED-backlit technology enhances brightness and color contrast, ensuring vivid visuals for various applications, from productivity tasks to multimedia consumption.

Under the hood, the M300 is powered by a selection of Intel processors, offering configurations that can handle everything from basic daily tasks to more demanding applications. This flexibility allows users to choose a model that best fits their performance needs. Coupled with a substantial amount of RAM, which can often be upgraded, the M300 excels in multitasking, allowing users to run several applications simultaneously without experiencing significant slowdowns.

Another key feature of the M300 is its robust storage options. With a combination of traditional hard disk drives (HDD) and solid-state drives (SSD), users can benefit from both spacious storage capacity and lightning-fast boot and load times, especially when opting for an SSD configuration.

In terms of connectivity, the Toshiba M300 is equipped with multiple USB ports, HDMI output, and a Gigabit Ethernet port, ensuring compatibility with a wide array of devices and peripherals. Wi-Fi capabilities allow for seamless internet access, making it a suitable choice for users who require constant connectivity while on the go.

The M300's design is also worth mentioning. It boasts a sleek, modern aesthetic that is both professional and stylish, making it suitable for a variety of environments—from office settings to casual use at home. The lightweight chassis enhances portability, appealing to users who frequently travel or work remotely.

Furthermore, the Toshiba M300 typically features a full-size keyboard with a responsive touchpad, designed for enhanced typing comfort and accuracy. This attention to user experience makes it ideal for extended use, whether for work, study, or leisure.

In conclusion, the Toshiba M300 is a well-rounded laptop that showcases Toshiba's commitment to quality and performance. With its strong processing capabilities, high-quality display, extensive storage options, and user-friendly design, it is a solid choice for anyone seeking a reliable and functional portable computing solution.