The -a option sets up PETSCII translation and Acme in the example looks like ASCII. If the source uses 8-bit characters and should be kept as-is then don't use that option. Otherwise (e.g. it's utf-8) use -a and set up an identity encoding in the ASCII range like this:
.enc "ascii"
.cdef " ~", 32
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Might be me. I was using the -a convert to petscii without that it compiles file but screws up all of my text.
The -a option sets up PETSCII translation and Acme in the example looks like ASCII. If the source uses 8-bit characters and should be kept as-is then don't use that option. Otherwise (e.g. it's utf-8) use -a and set up an identity encoding in the ASCII range like this: