Buffered VGA Adaptors for the Amiga 4000

[dandelion]

Hi all..

I have noticed there are two types of VGA Adaptor, buffered and unbuffered. The official Commodore silver adaptors were buffered, whereas I believe other developers sold unbuffered devices - simply connecting the necessary pins together.

When reading the Eyetech website they sell such an unbuffered device - and they state - "Not A4000". I believe I have a similar unbuffered adaptor which works fine with my a1200 and PC monitor but my a4000 just doesn't want to play ball. So, before I flash out on an official one, is this the cause of my woes? Or was the extra buffering due to problems with VideoToasters and other add-ons?

Anyone know for certain?

Thanks in advance

[bloodline]

dandelion wrote:
Hi all..

I have noticed there are two types of VGA Adaptor, buffered and unbuffered. The official Commodore silver adaptors were buffered, whereas I believe other developers sold unbuffered devices - simply connecting the necessary pins together.

When reading the Eyetech website they sell such an unbuffered device - and they state - "Not A4000". I believe I have a similar unbuffered adaptor which works fine with my a1200 and PC monitor but my a4000 just doesn't want to play ball. So, before I flash out on an official one, is this the cause of my woes? Or was the extra buffering due to problems with VideoToasters and other add-ons?

Anyone know for certain?

Thanks in advance

A buffered Analogue signal?

[dandelion]

[bloodline]

dandelion wrote:

A buffered analogue signal? Um..not sure what you mean. There exists to VGA Adaptor types for linking AA amigas to SVGA monitors, one buffered and one not. Not sure whether they are analogue or why that's important. Sorry :/

The only difference between the Amiga's video plug and a VGA plug are the position of the pins... I'm not sure what there is to buffer...

[dandelion]

no - i'm not sure either. But there must have been a reason for Commodore to create one and for Eyetech to advertise their own adaptors as "not a4000".

[bloodline]

dandelion wrote:
no - i'm not sure either. But there must have been a reason for Commodore to create one and for Eyetech to advertise their own adaptors as "not a4000".

Very strange... Check out here

Commodore VGA

[Framiga]

@Bloodline

no those active adatptor doesn't buffer the RGB analogic signal, but adapt (trough an inverter/buffer IC) the H-V signals.

Ciao

 

[bloodline]

Framiga wrote:
@Bloodline

no those active adatptor doesn't buffer the RGB analogic signal, but adapt (trough an inverter/buffer IC) the H-V signals.

Ciao

 

I see, that makes sense :-)

[Eddie]

Hi,

Could it be that the keyboard is too close to the A4000 video port ?  Therefore if the VGA adaptor is too bulk it presses against the keyboard lead - could damage the socket.

I found the DCE external flicker fixer had this problem, it could just about squeeze in, but with the pressure on the keyboard connector I bet it would damage the socket long term - swapped it for an internal one.  One Australian(?) company I noticed doesn't recommend the external DCE flicker fixers for A4000's, so the question is how bulky is the eyetech adaptor ? (if they've used a standard hobby electronics box it could explain it)

[voytech]

One time, when I wanted to do someting for my miggy by myself, I did such an ami video->vga adaptor.  It was working perfectly till I got a new svga monitor. I remember then, that i had to use a Double Inverter to get it to work properly. Don't remember what actually wired with (it was a long time ago) the DI, but it worked