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<!-- file missing [[File:cgs_photo_cgs25_keyscan.jpg|thumb|center|600px|]] -->
'''CGS25''' the '''CGS keyboard scanner sub-module''' module is intended for use in conjunction with the [[
As shown in the diagrams, it is wired so each group of 8 keys is accessed via an external select line, though a little cutting and jumpering using the alternate select lines of the 74LS138s, the keys can be selected as groups of 16 as is required by the parallel port adapter.
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[[File:cgs_schem_cgs25_keyscan.gif|thumb|center|600px|The schematic of the Keyboard Scanner. Click for a larger version]]
For a general description of how it works, please see the [[
== Construction ==
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