First post, by keropi
- Rank
- l33t++
Hiya
I was given an ATI SMALL WONDER GRAPHICS SOLUTION Version 1 card but it was a revision that was missing the composite output. Since I had a dead card but with the CVBS output installed I decided to add the missing components to the working one and see what happens. It works 🤣 but naturally the cvbs colors do not match the IBM CGA so they are wrong in games. Still better than nothing though 😎
So this is a list of what you need to add in case someone wants to do the same:
(image taken from the awesome VGA LEGACY MKIII website)
R1: 1.1 kΩ
R2: 2.2 kΩ
R3: 3.3 kΩ
R4: 750 Ω
R5: 750 Ω
R7: 680 Ω
R8: 750 Ω
R9: 360 Ω
R10: 75 Ω
R11: 33 Ω
C15: 150 pF
Q1: 2N3904
P2: RCA connector
J2: 4pin header (internal cvbs header for use with the IBM portable , pin2 is not populated)
You might also want to jumper JP2 as shown in the picture - I have no idea what JP1/JP2/JP3 do but the card with composite had this jumper installed.
That's it. It works but like I said the CVBS colors are wrong, if the target monitor has TINT controls then you can fix them on the monitor side.