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== Motherboard Revisions == Early 6-switch models used a two-board design with the main board housed in thick RF shielding and a separate switch board connected via ribbon cable. The 4-switch models consolidated to a single angled PCB. Key revisions include: * '''Pre-Rev 14:''' CD4050 buffer IC for controller inputs (prone to static damage) * '''Rev 14-15:''' Added static protection diodes, improved color output * '''Jr. models:''' Fully integrated single board, cost-optimized design
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