CGS keyboard scanner sub-module: Difference between revisions

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<!-- file missing [[File:cgs_photo_cgs25_keyscan.jpg|thumb|center|600px|]] -->
<!-- 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 [[Ken Stone parallel port adapter for IBM PCs|parallel port adapter]] and a PC. It allows the PC to scan the synthesizer keyboard to which it is connected, then to drive [[CGS digitally controlled oscillator|DCOs]] or VCOs via [[CGS D/A converter|D/A Converter]]s. It essentially contains the required parts to scan 32 keys, so two or more will be required for larger keyboards.
'''CGS25''' the '''CGS keyboard scanner sub-module''' module is intended for use in conjunction with the [[CGS parallel port adapter for IBM PCs|parallel port adapter]] and a PC. It allows the PC to scan the synthesizer keyboard to which it is connected, then to drive [[CGS digitally controlled oscillator|DCOs]] or VCOs via [[CGS D/A converter|D/A Converter]]s. It essentially contains the required parts to scan 32 keys, so two or more will be required for larger keyboards.


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.
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]]
[[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 [[Ken Stone parallel port adapter for IBM PCs|parallel port adapter]].
For a general description of how it works, please see the [[CGS parallel port adapter for IBM PCs|parallel port adapter]].


== Construction ==
== Construction ==
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