SEGA SATURN DEVELOPER'S MANUAL

Introduction: This manual explains the functions and usage of VDP2 (video display processor 2). VDP2 controls the scroll screen and display priority.
Manual notation: In this manual, the notation is as follows.
Binary, Hexadecimal: Binary numbers are indicated with a B at the end. For example, 100B. However, B may be omitted when it is clear that it is a binary number. Hexadecimal numbers are shown with an H suffix. For example, 00H and FFH.
Unit: 1K bytes represents 1024 bytes. 1M bit is 1024K bits and 1,048,576 bits.
MSB, LSB: In the byte and word structure, the left represents the most significant bit (MSB) and the right represents the least significant bit (LSB).
Undefined bit: Bits that are not defined in the register are represented by “—”. Write 0 to the undefined bit of the register.
∙ Table data defined on VRAM. Undefined bits are indicated by diagonal lines. As a rule, write 0. However, undefined bits are ignored.
Byte, word, bit: Bit is the smallest data unit that represents 0 or 1. The 8 bits are collectively called a byte. Two bytes are collectively called a word. The word begins with an even address.
Boundary: Data is defined from an address that is divisible by a specified numerical value. For example, the 20H byte boundary defines data at addresses starting with 20H, 40H, etc. The word is a 2-byte boundary.

Introduction