HelenOS sources
SGR_BGCOLOR 111 uspace/srv/hid/output/proto/vt100.c vt100_sgr(state, SGR_BGCOLOR + CI_WHITE);
SGR_BGCOLOR 116 uspace/srv/hid/output/proto/vt100.c vt100_sgr(state, SGR_BGCOLOR + CI_WHITE);
SGR_BGCOLOR 122 uspace/srv/hid/output/proto/vt100.c vt100_sgr(state, SGR_BGCOLOR + CI_BLACK);
SGR_BGCOLOR 127 uspace/srv/hid/output/proto/vt100.c vt100_sgr(state, SGR_BGCOLOR + CI_RED);
SGR_BGCOLOR 134 uspace/srv/hid/output/proto/vt100.c vt100_sgr(state, SGR_BGCOLOR + color_map[attrs.val.index.bgcolor & 7]);
SGR_BGCOLOR 175 uspace/srv/hid/output/proto/vt100.c vt100_sgr(state, SGR_BGCOLOR + CI_WHITE);
HelenOS homepage, sources at GitHub