Jim Thompson wrote:
Anyone know where I can find a good specification on closed
captioning...

Line number(s)

Data rates

Data levels

Location relative to sync tip, etc.

Thanks!

...Jim Thompson

EIA-608 for NTSC and 708 for HDTV
Does this help?

http://www.evertz.com/resources/eia_608_708_cc.pdf
--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Use only Genuine Interocitor Parts" Tom Servo ;-P