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+TL;DR version: if you want the ROMs to be included in the package,
+find the file "intv.zip" (and optionally "intv_ecs.zip") somewhere on
+the internet and place it in the SlackBuild directory, before running
+the script.
+
+Long version:
+
+By default, this package does not contain the ROM images due to
+copyright concerns. You can use the ROMs from the commercially
+available "Intellivision Lives!" CD-ROM, dump the ROMs from an
+Intellivision console, or attempt to find the ROMs on the 'net
+somewhere. These are the same ROMs used by the MAME/MESS emulator.
+
+For the Intellivision console, there are 2 ROM images, usually
+found in a file called "intv.zip". Contents:
+
+exec.bin, 8192 bytes, md5sum 62e761035cb657903761800f4437b8af
+grom.bin, 2048 bytes, md5sum 0cd5946c6473e42e8e4c2137785e427f
+
+If you also want to emulate the Computer Module (aka the Entertainment
+Computer System), you'll also need its ROM, usually found in a file
+called "intv_ecs.zip". Contents:
+
+ecs.bin, 24576 bytes, md5sum 2e72a9a2b897d330a35c8b07a6146c52
+
+*or*, split into 3 files:
+
+ecs_rom.20, 8192 bytes, md5sum 52f0bbbaff9ca21e619eb0ad5d85f9fb
+ecs_rom.70, 8192 bytes, md5sum 83efe70ebb42e3ded46ac76d851838a0
+ecs_rom.e0, 8192 bytes, md5sum ee2d7856f667ed66430be88871d86c39
+
+Your md5sums may not match, since Mattel released several versions of
+the ROMs. The above are known to work, but other versions might also
+work.
+
+If you want to include the ROM images in the package, place either
+the zip file(s) (intv.zip, and intv_ecs.zip if you need it) or the
+unzipped contents in the SlackBuild directory... or if you have them
+installed already in a previous jzintv package, or if you have them in
+/usr/share/games/mame/roms, the script will find them there also. You
+can also export JZINTV_ROM_PATH in the environment, to find the ROMs
+there.
+
+If you'd rather install the ROMs manually: build the package without
+them, install it, then copy them to /usr/share/games/jzintv/rom. If
+your ECS ROM is split into 3 files, join them with a command like:
+
+cat ecs_rom.20 ecs_rom.70 ecs_rom.e0 > ecs.bin
+
+jzintv looks for the .bin files, not the .zip file(s).