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■ Line color screen table address register

Line color screen table address register specifies the color mode of the line color screen and the top address of the table. This is a write-only 32-bit register located at addresses 1800A8H to 1800AAH. The value is cleared to 0 after power-on or reset, so be sure to set it.

Line color screen color mode bit : LNCL color mode bit (LCCLMD), bit 15

Specify the color mode of the line color screen.

LCCLMD Line color screen color
0 Make a single color
1 Specify line by line

Line color screen table address bit : LNCL table address bit (LCTA18 to LCTA0)
Specify the start address of the line color screen table on VRAM.

LCTA18 to LCTA16 1800A8H bits 2 to 0 <
LCTA15 to LCTA0 1800AAH bits 15 to 0

The actual top VRAM address is calculated using the following formula. If the VRAM capacity is 4M bits, the most significant bit of the address is ignored. 

 (Line color screen table start address) = (Line color screen table address register value 19 bits) × 2H

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