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more on sharp 80 column Atari 8-bit text

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hloberg

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At the end of the last post I briefly mentioned you could create a Luma only cable and s-video for the Atari 8-bits. This works on any 8-bit  where the Chroma & Luma are split out in the 5-pin DIN connector for the video & audio. There are some 8-bits that Atari elected NOT to separate out the Luma & Chroma unfortunately; 800XL made before August 1984, 1200XL and most 600XLs. All these computers had a single pin for just the composite connection only. There are ways to modify these computers to include chroma/luma but they all require modifying the motherboard in some form or fashion so I won't go into them here. 

Here is the video/audio pin-out for the Atari 8-bits.  

1194183549_Screenshot_2021-05-03AtariMonitor.thumb.png.2f646517c4667f19b2bd7da58f85bb17.png
To create a luma only video cable for sharp B/W 80 column video on a composite monitor:

pin 1 > video composite + on monitor

pin 3 > audio + on monitor

pin 2 > split to composite video - & audio - on monitor
what you would do is swap the luma cable for the standard color video cable when you wanted that sharp 80 column look.

This works on any un-modified Atari with the luma/chroma pins set on or modified Atari with the luma/chroma fix.

 

If you are lucky enough to still have an s-video monitor you can create an s-video cable that can give you 80 column & color.

200690911_Screenshot_2021-05-03S-Videopinoutdiagrampinoutsru.png.484c2e708b11d2ed6a9ebaab8679f6a8.png

s-video pinout.

Again, you will need an Atari 8-bit where the luma & chroma pins are set on.

To create an S-video cable:

Atari pin1 > s-video pin 3

Atari pin 5 > s-video pin 4

Atari pin 2 > s-video pins 1 & 2

sound is separate line from Atari pin 3 & 2.

If it turns out the 80-column text isn't quite sharp enough just attach Atari lines 1 & 2 which be just luma, no color.

 

Now I haven't tested the luma only cable personally but I talked to people who have and it worked for them. 

 

As always, this is just my suggestion. I am in no way responsible for any damage you may do to your Atari. (I don't see how you could harm our Atari making these cables but where there's a will there's a way).

 

There you have it. Have fun.

 

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