<22/86> VDP2 User's Manual / 4.4 Character Pattern

★ HARDWARE Manual ★ VDP2 User's Manual ★ Chapter 4 Scroll screen

▲ Back ｜ Forward ▼

VDP2 User's Manual / Chapter 4 Scroll Screen

■ 4.4 Character pattern

The character pattern is a square pattern consisting of 1 cell or 4 cells, and its size is specified in each register.

● Character size and cell layout

If the character pattern consists of 4 cells, the cell data used for the same character pattern must be stored consecutively in the character pattern table. Figure 4.7 shows the relationship between the cell arrangement according to the character size (the number of cells in the character pattern) and the character pattern table.

Figure 4.7 Cell layout by character size

Character pattern table　
Specified ─ → ┌────────┐　
Character │ │ ● In the case of 1 horizontal cell x 1 vertical cell　
Pattern │ Cell data 0 │　
Address │ │ ┌──────┐┬　
├────────┤ │ │ │　
│ │ │ Cell data 0 │ │ 8 dots　
│ Cell data 1 │ │ │ │ │　
│ │ └──────┘┴　
├────────┤ ├──────┤　
│ │ 8 dots　
│ Cell data 2 │　
│ │　
├────────┤　
│ │ ● In the case of 1 horizontal cell x 1 vertical cell　
│ Cell data 3 │ ┌──────┬──────┐┬　
│ │ │ │ │ │ │　
├────────┤ │ Cell data 0 │ Cell data 1 │ │　
│ │ │ │ │ │ │　
│ Cell data 4 │ ├──────┼──────┤ │ 16 dots │ │ │ │ │ │ │　
├────────┤ │ Cell data 2 │ Cell data 3 │ │　
│ │ │ │　
└──────┴──────┘┴　
├─────────────┤　
16 dots

▲ Back ｜ Forward ▼

★ HARDWARE Manual VDP2 User's Manual ★ Chapter 4 Scroll screen