wrd@tekigm2.UUCP (Bill Dippert) (01/13/86)
Has anyone tried the solution for the lack of chroma in the 800XL that was published in the February ANTIC i/o board column? Essentially it says that the chroma output is at the emitter of Q5. You need to connect a 200 ohm resistor from the junction of R67 and R68 to pin 5 on the monitor connection. Credit for this goes to the Chicagoland Atari Users Group. R67 R68 _____ __.__ _____ ^^^^^ | ^^^^^ | | > > 200 ohm > > | | | pin 5 Note: resistors R67 and R68 actually are next to each other and not back to back as this diagram would indicate. I have intalled this on my 800XL and the picture I get on my C*******e 1702 monitor is identical to that of my 130XE. (I would suggest to install this on the bottom side of the board. It is easier to get outside of the shield that way and also it is easier to solder.) Question: the diagram for the 130XE shows -- pin 1 composite luminance pin 2 ground pin 3 audio output pin 4 composite video pin 5 composite chroma -- the 800XL still has one pin not used (I think pin 4), what does this mean? Should this remaining pin be connected? If so, to what? Then on the 1200XL, I find that pin 5 is not connected to anything, but pin 4 is. Is pin 4 composite video on the 1200XL and if so, should I connect pin 5 to pin 4 or to something else (on the 1200XL)? I find it hard to imagine that the 130XE requires five pins connected and that the 800XL and 1200XL only require four pins connected. And not the same four to boot!!! By the way the pin configuration (per the 130XE manual, as looking at the connector on the computer is: |_| 3 . . 1 5 . . 4 . 2 [Only Atari would not number these pins consecutively!] --Bill-- tektronix!tekigm2!wrd ========================================================================= We still need to split to net.micro.atari and net.micro.st! =========================================================================
Steele.Henr@XEROX.ARPA (01/15/86)
>>[Only Atari would not number these pins consecutively!]
The numbering scheme used on the Atari Video Output connector is a
standard 5 pin DIN plug with standard 5 pin DIN plug numbering so you
can't blame Atari just the Germans.
---JOHN---
Xerox Corp.,Roch.,N.Y.info-atari@ucbvax.UUCP (01/22/86)
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