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1980s arcade video games generally had multiple ROM chips.

I suppose these often mapped into a single address space and often may have been bank switched in and out of sections of a single address space, and often a mix of the two.

Conceptually either should be possible in Ghidra's Memory Map window, using "Overlay" with "File Bytes". Even though I can import a second file into a window that already has a file open, going into the Memory Map, even though there's a dropdown menu for "File Bytes", it's only populated with one file.

Is there some way I haven't been able to find that lets me load two ROMs into a single address space? It's certainly useful for many other scenarios than just old arcade games.

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Yes it is!

After puzzling over this for a day and a bit I figured it out after posting the question here.

Instead of using File/Import use File/Add To Program

From there it seems to work as expected.

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    Don't forget to accept your own answer! Apr 18, 2020 at 22:28

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