Overview
The LC7471 is a video display controller for superimposing text and low-level graphics onto an NTSC-format television receiver. The LC7471 incorporates a 64 character internal character generator ROM, a 24-character × 64-line display ROM and a 176-character display RAM. Up to 288, 12 × 18-pixel characters can be displayed under microprocessor control on a 24-character by 12-line display.
The LC7471 features selectable pixel width and pixel height, and 64 vertical and 64 horizontal display start positions. It also features a flashing enable bit for each character position.
The LC7471 operates from a 5 V supply and is available in 22-pin shrink DIPs.

Features
• Complete text and graphics video overlay circuitry.
• 64-character internal character generator ROM.
• 24-character × 64-line display ROM.
• 176-character display RAM.
• 288-character display capability.
• 12 × 18-pixel characters.
• Four pixel widths.
• Four pixel heights.
• Selectable background color.
• Approximately 0.5 or 1 s period character flashing option.
• 25, 50 or 75% flashing duty cycle.
• Internal or external synchronization.
• Serial data control.
• 5 V supply.
• 22-pin shrink DIP.