Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uunet!cbmvax!cbmcats!adam
From: adam@cbmcats.UUCP (Adam Keith Levin)
Newsgroups: comp.sys.amiga
Subject: Re: Centering screen on Moniter
Summary: Kickstart modification instructions
Message-ID: <123@cbmcats.UUCP>
Date: 13 Dec 89 17:12:55 GMT
References: <8218@wiley.UUCP>
Reply-To: adam@cbmcats.UUCP (Adam Keith Levin)
Organization: Commodore Business Machines, Tech Support
Lines: 51

In article <8218@wiley.UUCP> emao@wiley.uucp.UUCP (Edward Mao) writes:
>
>Is there a way to center the output of the composite video out on an
>Amiga 1000?  I know you can use the preference tool on Workbench to do
>it but I need to do it on disks which boot up directly.
>
>Thanks,
>Edward

Yes, but it is something of a hassle.

This method requires that you update a copy of a Kickstart
disk with the new View offsets.  If you then use this Kickstart disk
when booting your A1000, most boot-load programs will use the offset
information to center the screen.  Note that some programs (most
notably games) do not bother with the information in "preferences".

Here are the steps required:

1.  Figure out what preferences information is different:

	Go into Preferences and select "Reset All".  Save this setting.
	Rename devs:system-configuration to devs:s-c.default.
	Go into Preferences and position the screen as you prefer it.
		Save this setting.
	Use "Type OPT H" (or some hex file compare program) to look at the
	hex versions of the two files.  They will differ in the screen position
	information.  Note the offset of these bytes from the printer driver name
	("generic").

2.  Find the preferences information on the Kickstart disk:

	Using a disk utility with ASCII search capability, find the printer name
	on the kickstart disk (again, "generic").
	At the same offset from the driver name, find the bytes containing the
	default positioning information.

3.  Update the information:
	Change these bytes to your preferred values.
	Write the changes to the Kickstart disk.
	There is a program in the Public Domain (on a Fish disk, I believe)
	to recompute the Kickstart checksum.  Use it to make this new Kickstart
	disk usable.

4.  Power down your A1000, power it back up and boot with the new Kickstart.


-- 
Adam Keith Levin  --  CATS     Commodore Applications and Technical Support
1200 Wilson Drive / West Chester, PA  19380                  (215) 431-9180
BIX: aklevin             UUCP: ...{amiga|rutgers|uunet}!cbmvax!cbmcats!adam