Added a profile for the Swedish computer ABC80

[sweproj]

I have added a profile for the Swedish computer ABC80

[hoglet67]

Just a quick note to say we are still considering ABC80 support.

Regarding this pull request, IanB said the following:

The ABC80 also looks problematic. The pixel clock is set to 12Mhz but the schematic indicates 11.9808Mhz:
https://www.abc80.net/old/ver1/luxor/abc80schema/abc80schema_3.gif
Also the palette is set to the TEA1002 which is not really the correct palette for a mono machine
It will probably work due to the clock tolerance setting but should be corrected for reliable operation.
(There is also an ABC800 with 12Mhz pixel clock and RGB)

[sweproj]

Hi

Thanks for the comment. I will update the clk. and make a new pull request but before this, just a comment/question. I have tried the monochrome profile as well but the text gets quite dim even with, i will try to investigate more before the new pull
BTW this was my first pull request ever so sorry if its not correct.

Also im working on a board for ABC800 and 806 that has TTL output, together with PSU and USB keyboard. https://git.sweproj.com/ABC80/key800/src/master/pic/front.png

I will add a profile to this as well when the board is tested

Per

[IanSB]

Thanks. This pull request has been integrated manually.