Suitable DRAM chip: HM514400CS6 Hitachi DRAM 1,048,576 x 4-bit 20 pin SOJ DRAM

Features:

• Single chip teletext IC 
• Stores up to 14 teletext pages on chip
• Stores up to 2048 teletext pages with external 16 M memory
• Analog RGB-output
• 41 latin script languages
• 12 × 10 character size
• Parallel display attributes
• 64 from 4096 colors selectable
• Enhanced flash modes
• Dynamically redefinable character set (DRCS, PCS)
• Pixel graphics
• Full-screen display (64 × 32 or 80 × 24 character positions)
• Horizontal and vertical scrolling
• Graphic cursors
• 4:3 and 16:9 display
• Multinorm display (50/60/100/120 Hz)
• RISC-processor
• Firmware downloadable
• I2C / 3 wire UART-interface (1 Mbit/s) 
• Independent clocks for acquisition and display
• Tools for greatly simplified software development
• PLCC-68-1
• P-SDIP-52-1
• 24-kbyte on-chip reconfigurable DRAM
• 44160-bit character ROM
• One external crystal for all standards (20.48 MHz or 8 MHz crystal, depending on which data sheet you read)

Teletext Features:

• Analog CVBS-input with on-chip clamping circuitry
• Data Slicer
• Supports level 1, 2.5 and 3.5 ETSI teletext standard
• full level 2.5 processing