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This article is from the Geographic Information Systems FAQ, by Lisa Nyman lnyman@census.gov with numerous contributions by others.

6.4: How do you convert ARC coverages to IDRISI? (Geographic Information Systems)

From: Mike Killion <mike@geogsun.geo.ukans.edu>
To convert an ARC/INFO coverage to an IDRISI image (.img) file -
1) use the ARC command POLYGRID to convert the ARC coverage to an ERDAS
16-bit file (there are other options,but this one has been the least trouble
in my experience.) You will need to provide the coordinates of the lower
left corner of your coverage,and information about cell
size(cell resolution, number
of rows and columns), and you'll need to specify one numeric item to be
used as the "z-value" for the new raster image.
2)use the IDRISI command ERDIDRIS (locate under the Import/Export menu) to
convert the ERDAS file to an IDRISI image file. Before the new IDRISI image
can be used, you'll have to create a documentation file for it.

Another option is to UNGEN your ARC coverage then use the 3DRISI command
3RCIDRIS, but I've never had much luck with this one.
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