Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!uc!shamash!mpe
From: mpe@shamash.cdc.com (2375)
Newsgroups: comp.lang.pascal
Subject: Re: 256 colour mode in TP5.0
Message-ID: <18812@shamash.cdc.com>
Date: 12 Mar 90 16:58:24 GMT
References: <25F744E5.8753@maccs.dcss.mcmaster.ca>
Reply-To: mpe@shamash.UUCP (Mike Ebsen 482-2375)
Organization: Control Data Corp., Arden Hills, MN
Lines: 9

The problem of capturing images using turbo pascal is that there is no way
to read the palette registers back from the display controller card.  Within
the run-time environment, an array of previous values is used by the BGI 
graphics manager to shadow the palette contents.  Long before you invoke your
getimage program, a TSR that captures the int 10 interupt commands which update
 the CRT control, must monitor all int 10's for potential palette updates.
Also, each shell opened by the user, loads it's own version of the command.com
and *.bgi file base and therefore creates a yet another set of palette array
registers.  Good luck.