Combining two 27020 display images into one 27040
Steps
- Some displays (Lethal Weapon 3, for one) used two 27020 EPROMs at ROM 0 and ROM 1 instead of one 27040 at ROM 0, and the factory downloads come as two 27020 files.
- Join the files in binary with the ROM 1 image first and the ROM 0 image second.
- Burn the result into a single 27040 and fit it at ROM 0.
Systems
Games
Related tips
- Dot matrix controller CPUs by display size
- Lethal Weapon 3: CPU and display EPROM types and latest versions
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- Alphanumeric segments still missing: the UDN chips
- Check the segment resistors before buying a UDN7180
- DMD shows lines or garbage and no controlled lamps light
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Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Two, Clay Harrell (pinrepair.com)