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The diagram below shows how you can switch between normal Atom-video and the VDU 80 mode.  |
Components
| IC1 | 74HC244 | R1 |
5,1 | kOhm |
| IC2 | 74HC245 | R2 | 5,1 | kOhm |
| IC3 | 74HC30 | R3 | 470 | Ohm |
| IC4 | 74LS154 | R4 | 470 | Ohm |
| IC5 | 74HC04 | R5 | 470 | Ohm |
| IC6 | 74LS00 | R6 | 1 | kOhrn |
| IC7 | 74LS123 | R7 | 2,2 | kOhm |
| IC8 | 74HC138 | R8 | 680 | Ohm |
| IC9 | 74HC273 | R9 | 12 | Ohm |
| IC10 | 74HC21 | R10 | 82 | Ohm |
| IC11 | 6116 / 6264 | R11 | 270 | Ohm |
| IC12 | 6116 / 6264 | C1 | 10 | pF |
| IC13 | EF 9345-P | C2 | 82 | pF |
| X1 | 12 MHz | C3 | 10 | nF (ceramic) |
| T1 | BC 556 B | C4 | 47 | µF / 16 Volt |
| T2 | BC 549 B | C5-7 & 9-10 | 100 | nF |
| P1 | 1 kOhm adjust. | C8 | 100 | µF / 16 Volt |
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