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Chapter 3 RAM

VDP2 is connected with a dedicated VRAM for defining pattern name tables and character patterns. VRAM is divided into two equal parts called VRAM-A and VRAM-B respectively. VRAM-A and VRAM-B can be divided into the same capacity called bank 0 and bank 1, respectively. The four banks of the same capacity divided in this way are called VRAM-A0, VRAM-A1, VRAM-B0, and VRAM-B1. The data shown in Table 3.1 is defined in VRAM.
In addition, the scroll RAM and color RAM for defining sprite color data are built in.

Table 3.1 Data defined in VRAM 
 Data that must be defined when the display format is cell format 
 Data that must be defined when the display format is bitmap 
 format 
 Data that must be defined 
 Data that is defined as needed 
 Pattern name table data 
 Character pattern data 
 
 
 
 
 
 Bitmap pattern data 
 
 
 
 
 
 
 Line scroll table data 
 Vertical cell scroll table data 
 Rotation parameter table data 
 Coefficient table data 
 Line color screen table data 
 Back screen table data 
 Line window table data

3.1 Address map

VDP2 supports two types of VRAM, 4M bit and 8M bit. Programs written for systems using 4Mbit VRAM can be used for systems using 8Mbit VRAM, but not the other way around.

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