(b/w only) composite video "dac"

gistfile1.txt

$ 1 0.000005 10.20027730826997 50 5 43 5e-11
r 64 128 176 128 0 680
r 64 208 176 208 0 115
r 240 160 336 160 0 75
r 448 160 448 272 0 75
g 448 272 448 320 0 0
x 468 129 516 132 4 12 receiver
x 261 111 302 114 4 12 sender
w 336 160 448 160 0
w 176 128 176 160 0
w 176 160 240 160 0
w 176 208 176 160 0
x 105 84 132 87 4 12 sync
x 98 177 173 180 4 12 video\s(luma)
R -32 80 -32 32 0 0 40 3.3 0 0 0.5
s -32 128 64 128 0 0 false
s -32 208 64 208 0 0 false
w -32 80 -32 128 0
w -32 128 -32 208 0
p 448 160 544 160 1 0 0