[Coco] Using Roy's vga adapter with other computers

[Steven Hirsch]

On Sun, 25 Oct 2009, Gene Heskett wrote:


>> Any hints on where to get parts for creating the cable needed?

>

> Keep in mind when srcing the parts, that the amiga's video connector is _not_

> a db25, but a db23.


The DB23F required for the computer end of the cable is rare, but there 
are a few folks on the internet selling them.


>  Also keep in mind that the agnus chip cannot drive all 5

> outputs and will shut down to protect itself if the H&V sync lines aren't

> buffered with external logic. All of the cables made back in its heyday

> actually had a cmos logic chip buried in the backshell plastic casting to not

> only buffer the synch signals but also combined them into whatever mode and

> polarity that monitor needed.


But, the Amiga connector supplies both H&V sync and composite on three 
separate lines.  Why would you need further munging?


> It being cd4000 family cmos stuff, wasn't all

> that happy driving a 75 ohm load, so the failure rate was a problem, I've had

> to cut it off and build a new one twice now.  And I used the 74HC nand gate

> for that, much more robust.


Is that what's inside those silver HD15F --> DB23F adapters that were 
provided with newer Amigas?

Steve


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