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From: aduncan@rhea.trl.oz.au (Allan Duncan)
Newsgroups: comp.sys.amiga
Subject: Re: Commodore 1950
Message-ID: <2039@trlluna.trl.oz>
Date: 7 Aug 90 06:06:43 GMT
References: <140231@sun.Eng.Sun.COM>
Sender: root@trlluna.trl.oz
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From article <140231@sun.Eng.Sun.COM>, by cmcmanis@stpeter.Eng.Sun.COM (Chuck McManis):
...
> make that sharp turn that defines the "face" of the tube, and secondly
> as you deflect the electron beam further and further it becomes more 
> difficult to control and begins to hit the phospor at an odd angle making
> it more difficult to maintain consistent intensity.
> 
> 	In 1978 I had a Digital Group 4 board Z80 system with the TVIF
> interface. This interface was 16 lines of 64 characters on a converted
> TV set. I _hated_ the fact that the Characters at the beginning and end
> of the lines were wider than the characters in the center of the screen.
> I tried everything I could to tighten it up so that all 64 characters
> would land on the linear region of the tube. I was never completely
> successful. During those years it became somewhat prestigious to get
> 64 characters on the screen (or, hold me back, 80 characters) and not
> have to go into the "yukky overscan region" of the tube. 

I fondly remember a 7" 70 degree unit that would give you 180 crisp and
even characters if you wanted!  It really comes down to deflection angle
and correction electronics (domestic units are 110 degrees, "high
resolution" are 90 degrees).  The lower angle units have long tubes that
poke out the back, and correction electronics cost money.  If I pay 4
grand for a 25" data monitor, I expect (and get) uniform performance
right out to the screen mask edge.  Lesser amounts give lesser
performance.

Allan Duncan	ACSnet	a.duncan@trl.oz
(03) 541 6708	ARPA	a.duncan%trl.oz.au@uunet.uu.net
		UUCP	{uunet,hplabs,ukc}!munnari!trl.oz.au!a.duncan
Telecom Research Labs, PO Box 249, Clayton, Victoria, 3168, Australia.