This thread was where we discussed the PowerR adapters ...The Power R MC-10 (which was designed specifically for the Classic) did something like this. Can somebody confirm my suspicion that it was still TTL output? Would it work with a Classic II?
And yes, it did provide a standard TTL output:
Power R Model MC-10 Video Adapter for Macintosh Classic and Classic II
Allows you to view your Macintosh display on LCD panels, LCD projectors, external monitors and scan converters. Installs in minutes with no cutting, drilling or soldering.
Specifications:
Resolution........................................512 x 342
Horizontal scan rate..........................22.3KHZ, (4µs on, 40µs off)
Vertical scan rate .............................60HZ (180µs on, 16.4ms off)
Output level (all lines) .....................TTL Positive
Video Connector Pins (pin out)........1-2 gnd; 3-4-5 RGB; 8 Horz; 9 Vert.
Power Consumption .......................0.25 watts from Mac power supply
Price..........$99.00