VIDC speed

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2 total messages Started by Matthias Sattler Fri, 31 Jul 1992 12:21

#87

Author: Matthias Sattler
Date: Fri, 31 Jul 1992 12:21

23 lines
1712 bytes

In article <17326@acorn.co.uk> osmith@acorn.co.uk (Owen Smith) writes:

>I need the high refresh rate to prevent headaches. 800x600x256x56Hz is
>vaguely feasible, but the VIDC chip usually can't quite handle it and the
>display is speckled. This also steals two thirds of the system memory
>bandwidth, and is well out of spec for the machine. I also have a friend who
>used a 48 MHz oscillator in a PCATS graphics enhancer (standard is 24,
>25.175 and 36 MHz) to get 1024x768x16x50Hz. It worked fine, but his Eizo
>9060S monitor couldn't quite display it. 1024x700x16 was OK though.

I used 60 Mhz VIDC frequency in my A5000 and it worked quite well with
1024x768x16x60Hz. And even the normal A5000 monitor did it. But I have
one BIG problem, the VIDC is too slow for that. Meaning I have to cool
it all the time using cooling-spray ("Kaeltespray" in german but I think
you'll understand what I mean) because the silicon based microchips are
fastest at about 0 oC. 
Does someone know if there is a faster VIDC available or how to cool it
permanently to 0 oC.

Matthias Sattler
e-mail: @uni-kl.de:m_sattle@poker.informatik.uni-kl.de
(Funny but this should work.)

Re: VIDC speed

#103

Author: C.Wong1
Date: Mon, 03 Aug 1992 11:40

23 lines
1365 bytes

In article <1992Jul31.122130.13142@rhrk.uni-kl.de> @uni-kl.de:m_sattle@poker.informatik.uni-kl.de (Matthias Sattler) writes:

>I used 60 Mhz VIDC frequency in my A5000 and it worked quite well with
>1024x768x16x60Hz. And even the normal A5000 monitor did it. But I have
>one BIG problem, the VIDC is too slow for that. Meaning I have to cool
>it all the time using cooling-spray ("Kaeltespray" in german but I think
>you'll understand what I mean) because the silicon based microchips are
>fastest at about 0 oC. 
>Does someone know if there is a faster VIDC available or how to cool it
>permanently to 0 oC.
>
>Matthias Sattler
>e-mail: @uni-kl.de:m_sattle@poker.informatik.uni-kl.de
>(Funny but this should work.)

hi,
I believe it is possible to attach heatsinks to the chip ?? Also I have
heard that there are Peltier effect hs available, but I don't think they come   cheap ! Check out the electronic suppliers, such as Verospeed, RS, Electrovalue
...

regards

Chun

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