Black border?

Discussions about Sinclair ZX80 and ZX81 Hardware
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mrtinb
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Black border?

Post by mrtinb » Mon Nov 06, 2017 11:11 am

With UDG, I can create an inverted char set to make a screen with white chars on black screen. Can an external interface be made to change the white border to black? Or can it be done in software?
Martin
ZX81, Lambda 8300, Commodore 64, Mac G4 Cube

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siggi
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Re: Black border?

Post by siggi » Tue Nov 07, 2017 12:44 pm

Yes, an external interface called "Chroma81" is able to set the border colour (also to "black") ;)
http://www.fruitcake.plus.com/Sinclair/ ... iption.txt

Maybe also simple video interfaces (CCP???), which can invert the whole picture, will show a black border.

Siggi
My ZX81 web-server: online since 2007
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Andy Rea
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Re: Black border?

Post by Andy Rea » Wed Nov 08, 2017 9:02 am

are you handy with a soldering iron? the following page may be of interest.

http://www.user.dccnet.com/wrigter/inde ... verter.htm

regards Andy
6 x ZX81, 1 x TS1500 , 1 x +3e, 1 x timex 2040 printer, 1 x timex 2020 cassette deck, siclair printer and some spectrum

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PokeMon
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Re: Black border?

Post by PokeMon » Thu Nov 09, 2017 10:12 pm

It is easy with the ZX8-CCB video mod.
There is a jumper to select inverted picture and this could be even used with a switch.
Don't need to change character patterns for this. ;)

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