RTG graphics card

• NCR 77C22E+
  • 90 MHz max pixel clock
  • 70 MHz in 8 bit modes
  • 25 MHz in 24 bit modes
  • 15-75 kHz horizontal frequency
  • 50-100 Hz vertical frequency
• 1, 2 or 4 MB DRAM, page mode, segmented, 70-80 ns
• sixteen ZIP sockets
  • 1 MB setup: every second socket (1, 3, 5, 7…) is populated with a 256k×4 chip (414256)
  • 2 MB setup: every socket is populated by a 256k×4 chip (414256)
  • 4 MB setup: every second socket (1, 3, 5, 7…) is populated with a 1M×4 chip (414400)

screen modes

• 2400×1200×8 interlace
• 1280×1024×16 non-interlace
• 1024×768 non-interlace

notes

• optional external composite encoder – gives television style video output
• optional video encoder – S-VHS and composite outputs
• HD15 VGA connector
• EGS and RetinaEmu drivers
• supported by NetBSD (except for X server) and OpenBSD

manual
drivers & installation
firmware