EGA-VGA adapter

A friend of mine sent me this message, but I really don't have a clue about EGA "intensity" or how to wire the adapter. Suggestions? I believe I'm making an EGA-VGA adapter. I found the pinouts on http://www.monitorworld.com/faq_pages/q17_page.html The problem I find is that VGA is analogue and EGA is/was TTL based (digital) VGA (HDB15) --- 1 Red 2 Green 3 Blue 4 Sense 2 5 Self Test/TTL Ground 6 Red Ground 7 Green Ground 8 Blue Ground 9 Key 10 Logic/Sync Ground 11 Sense 0 12 Sense 1 13 Horizontal Sync 14 Vertical Sync 15 Sense 3 EGA (DB9) --- 1 Ground 2 Ground 3 Red 4 Green 5 Blue 6 Intensity 7 No Connection 8 Horizontal sync 9 Vertical sync So I figure I can safely map (EGA-VGA) 1,2 - 5 (Grounds on EGA to TTL ground on VGA) 3 - 1 (red) 4 - 2 (green) 5 - 3 (blue) 8 - 13 (H-sync) 9 - 14 (V-sync) See, now theres still the 6th pin on the DB9 - intensity. I have no clue what to do with this. I figured it was safe to connect the two grounds on the DB9 to the TTL ground on the HDB15. Do you have any suggestions about this?