Re-make of the Atari 1090XL 80 column card for monochrome monitors.

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Main components

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Part NumberDescription
74LS20
MC6845
20L10
74LS138
74LS86Quad 2-input XOR
74LS854-bit Comparator
74LS10
6116
74LS244
74S00
74LS374
74LS174Hex D-type Flip-Flop, reset
2716
74LS166
LCV7805
74LS74Dual D Flip-flop, Set & Reset
74LS04Hex Inverter

80cvc schematic

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80cvc board layout