A3000 Virtual Terminal Problems due to Overscan - HELP

[Mike "Ford" Ditto]

rodney at solar.card.inpu.oz.au (Rodney Campbell) writes:
> I have an Amiga 3000UX and I have decided (much to my detriment) to try
> the overscan feature in an attempt to get some more screen space.
[ ... ]
> Now I did this and it sort of worked but it was a little too much so I
> thought I might just reduce the number of extra pixels and the offset
[ ... ]
> After Reboot all of the virtual screens were garbled and just producing
> flashing out of sync blocks of colour.

In the current software, only certain specific horizontal adjustment
settings work correctly.  This limitation will be removed in the
future.  When the documentation was written, we didn't know this
limitation would be present.

Some settings that should work include:

	Horizontal offset can be 0, -8, or -16.
	Horizontal overscan can be 0, 16, or 32.

There are no such peculiar limitations in the vertical direction.

Some functional settings are:

	  0  0  0  0		# 640 x 400, (no overscan)
	-16  0 16 16		# 672 x 432
	-16  0 32 32		# 704 x 464

The example in S70sioc that shows horizontal offset -12 doesn't work
on all systems and will be changed in future releases.


> It seems that whatever this line:
> sioc setdisplayadjust -offsetx -offsety overscanx overscany
> does is cumulative and thus it offsets and overscan amounts are
> continually cycling past the displayable area.

No, this is not true and must have been an illusion.

> If anyone knows if this is true and how to get the damn thing to return to
> the original state I would be most appreciated.

The original state, of course, would be achieved by commenting out the
line, as it was shipped, and rebooting.  I hope one of the above
examples also works for you to give you the overscan you want.

					-=] Ford [=-

"The term most often used in this	(In Real Life:  Mike Ditto)
 manual is `implementation-defined'."	ford at amix.commodore.com
 - SVR4 Programmer's Guide: POSIX	uunet!cbmvax!ditto
					ford at kenobi.commodore.com