Code

Beeps

POST Routine Description

 

 

 

46h

2-1-2-3

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

 

 

 

58h

2-2-3-1

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 User Patch1

 

 

 

66h

 

Configure advanced cache registers

 

 

 

67h

 

Initialize Multi Processor APIC

 

 

 

68h

 

Enable external and CPU caches

 

 

 

69h

 

Setup System Management Mode (SMM) area

 

 

 

6Ah

 

Display external L2 cache size

 

 

 

6Bh

 

Load custom defaults (optional)

 

 

 

6Ch

 

Display shadow-area message

 

 

 

6Eh

 

Display possible high address for UMB

 

 

recovery

 

 

 

70h

 

Display error messages

 

 

 

72h

 

Check for configuration errors

 

 

 

76h

 

Check for keyboard errors

 

 

 

7Ch

 

Set up hardware interrupt vectors

 

 

 

7Eh

 

Initialize coprocessor if present

 

 

 

80h

 

Disable onboard Super I/O ports and IRQs

 

 

 

81h

 

Late POST device initialization

 

 

 

82h

 

Detect and install external RS232 ports

 

 

 

83h

 

Configure non-MCD IDE controllers

 

 

 

84h

 

Detect and install external parallel ports

 

 

 

85h

 

Initialize PC-compatible PnP ISA devices

 

 

 

86h

 

Re-initialize onboard I/O ports

 

 

 

87h

 

Configure Motherboard Configurable Devices

 

 

(optional)

 

 

 

88h

 

Initialize BIOS Area

 

 

 

89h

 

Enable Non-Maskable Interrupts (NMIs)

 

 

 

8Ah

 

Initialize Extended BIOS Data Area

 

 

 

8Bh

 

Test and initialize PS/2 mouse

 

 

 

Chapter 4

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Acer 1520 manual Chapter

1520 specifications

The Acer 1520 is a noteworthy addition to the lineup of mid-range laptops, designed primarily for users seeking reliable performance for everyday computing tasks. This laptop strikes a balance between performance, portability, and affordability, making it an excellent choice for students, professionals, and casual users alike.

One of the standout features of the Acer 1520 is its display. With a 15.6-inch screen, it boasts a Full HD resolution that delivers sharp and vibrant visuals. The anti-glare coating further enhances the viewing experience by reducing reflections, making it suitable for various lighting conditions. Whether you're working on spreadsheets, watching movies, or browsing the web, the display offers an immersive experience.

Under the hood, the Acer 1520 is powered by the latest Intel Core processors, providing ample power for multitasking and demanding applications. Coupled with up to 16GB of RAM, users can run multiple applications smoothly without experiencing lag. This makes it ideal for users who require a machine that can handle everything from basic tasks to more resource-intensive operations like photo and video editing.

Storage options in the Acer 1520 include both traditional HDDs and faster SSDs. This flexibility allows users to choose between larger storage capacities at a lower cost or faster performance with reduced load times. Furthermore, the laptop supports additional storage options through USB ports, including USB 3.0, which enables quick file transfers.

The design of the Acer 1520 is user-friendly, featuring a chiclet keyboard that enhances typing comfort and precision. The touchpad is responsive and supports multi-touch gestures, making navigation intuitive. Additionally, the ergonomic design contributes to a comfortable user experience over extended periods.

Connectivity is another strong point of the Acer 1520. It comes with a variety of ports, including HDMI, USB-C, and an audio jack, allowing for easy connection to external devices like monitors, projectors, and audio systems. The inclusion of Wi-Fi 6 technology ensures that users enjoy faster internet speeds and a more stable connection, which is particularly beneficial for streaming and online gaming.

In summary, the Acer 1520 is a versatile laptop that delivers solid performance, a vibrant display, and a range of connectivity options, making it a great option for anyone in search of a dependable computing device for daily use. Its combination of features, performance, and value positions it well in the competitive laptop market, catering to a diverse set of requirements.