TTL output from an 800XL?

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2 total messages Started by Jeff Makey Tue, 26 Aug 1986 01:15

#378

Author: Jeff Makey
Date: Tue, 26 Aug 1986 01:15

5 lines
736 bytes

Is there any way to get TTL video output from an 800XL without building
some sort of RF-to-TTL or composite-to-TTL converter?

                       :: Jeff Makey
                          Makey@LOGICON.ARPA

Re: TTL output from an 800XL?

#387

Author: T Burger
Date: Thu, 28 Aug 1986 13:21

29 lines
1080 bytes

> Is there any way to get TTL video output from an 800XL without building
> some sort of RF-to-TTL or composite-to-TTL converter?

If you mean RGB TTL the answer is; You have to build something.

If you mean a TTL version of the luminance signal then it is available
	inside the 800XL.

	The GTIA chip (U17) has 4 bits of luma on pins

		31   bit 0
		22   bit 1
		23   bit 2
		24   bit 3

		25   sync

	these are buffered by a 4050 (U20)

		6  bit 0
		12 bit 1
		4  bit 2
		2  bit 3
		15 sync


Hope this helps.

Ted Burger

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