Specifications

SL 486VE User's Manual
• Slots:
П 8 EISA slots with 6 EISA-master slots (S1-S6) and 2 EISA slave slots
(S7, S8).
n Two VESA slots (S9, S10) with one master/ one slave slot or two slave
slots.
• Form Factor: Baby AT size, 6 layers PCB SMD design.
1.2 Major Components
The SL 486VE mainboard is composed of many integrated circuits, chips,
jumpers and connectors. (Please refer to Figure 3.1)
The major components and their basic features and functions are outlined as
below:
• 80486 CPU (Central Processing Unit)
The central processing unit is the brain of a computer system that interprets
and executes instructions, such as performing calculations, routing informa-
tion, and temporarily storing data. In personal computers, the CPU is a highly
integrated chip called the microprocessor.
11 SiS/EISA 486 Chipset
The SiS85C405, 85C406 , 85 C411, 85C420, and 85C431 chipset supports
486-based EISA system. Such chipset is achieved through a very high level of
function integration, system partition and is proven to be a highe performance,
compact and cost-effective product. This EISA chipset consists of the follow-
ing:
П SiS85C405 (Address Buffer)
The Address Buffer is a buffer interfacing between EISA LA and SA
address bus. It also contains EISA bus refresh counter to generate address
during refresh cycle.
n SiS85C406 (Highly Integrated System Peripheral)
The Highly Integrated System Perpheral integrates all the necessary
peripheral control logic used in eisa specific applications, the SiS85C406
4-2