[quarterturn]

I think I have found the answer:
http://www.epanorama.net/documents/vga2rgb/vgamonitor.html

It describes the LM1881N plus a few log gates to get a true hsync. With that I should be able to drive my TTL monitor using a composite video signal.

I have a teensy++ 2.0 which has 8k RAM. Timing issues aside, that ought to be good for at least 256×192. That will allow for a 40×24 line display, assuming 5×7 characters with 1 pixel spacing between them.

[quarterturn]

The monitor I have is 15 kHz horizontal scan rate so I guess that’s basically the CGA standard, only in monochrome (640×200). I think that’s also NTSC in non-interlaced mode.

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