Motherboard Description; Slot-1 Motherboard Placement And Routing; Table 2-1. Different Board Size Lists For Slot-1 System - VIA Technologies Apollo Pro133A Design Manual

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2.2 Motherboard Description

This section illustrates proposed component placements for an Apollo Pro133A based motherboard with different system

configurations to achieve maximum optimization. The description of the Printed Circuit Board (PCB) for a motherboard is also

given.

For Slot-1 CPU and Apollo Pro133A PC motherboard designs, two proposed placements and group signal routings for the two

most popular form factors (ATX and micro-ATX) are shown in figures 2-3 and 2-4 respectively. Detailed layout guidelines and

signal routings for the Pro133 chipset will be addressed later in section 2.4.

Each figure shows a full size of its respective form factor. The empty area at the bottom of each placement diagram can be

eliminated to reduce the board size. Table 2-1 shows the full size and the suggested compact size for each form factor

implementation.

Form Factor Type

ATX

12" x 9.6" (30.5cm x 24.5cm)

Micro-ATX

9.6" x 9.6" (24.5cm x 24.5cm)

Preliminary Revision 0.5, November 19, 1999

Design Guide - VT82C694X Apollo Pro133 with VT82C686A

Full size

12" x 7.9" (30.5cm x 20cm)

9.6" x 7.9" (24.5cm x 20cm)

Compact Size

Specification

1 AGP, 5 PCI, 1 ISA, 1 AMR, 3 DIMM

1 AGP, 2 PCI, 1 ISA, 1 AMR, 2 DIMM

Motherboard Design Guidelines

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