crash Posted February 13, 2006 Share Posted February 13, 2006 Greetings, Does anyone know if it is possible to edit MyDos to change the screen colors from Blue/White to something with a bit more contrast like Black/White? Alternatively, does anyone know of a program that will change screen colors, that I could load prior to MyDos? Thanks! Quote Link to comment Share on other sites More sharing options...
Rybags Posted February 14, 2006 Share Posted February 14, 2006 When you call DOS, MyDOS re-opens the screen, changing the colours back to their defaults. I had a quick look through the code, the easiest way is to do a patch in the DUP.SYS file. I've added some code to the end of the DUP.SYS file, to change the colours you want, go into the monitor (F8). C 4334 nn (nn= hex value for background colour) C 4339 nn (nn= text colour) To make the change permanent, you have to write the DOS files back to a disk. MYDOS45.zip Quote Link to comment Share on other sites More sharing options...
crash Posted February 14, 2006 Author Share Posted February 14, 2006 (edited) SWEET! Thank you very much! Hmmm... Strangely enough, if I try to set the background color to 00, it will change to black, but if I write the changes to disk, the ATR no longer functions. Any ideas? Also, how did you go about adding the code? Can this be appended to MyDOS 4.53/4? MyDOS454.zip Edited February 14, 2006 by crash Quote Link to comment Share on other sites More sharing options...
Rybags Posted February 14, 2006 Share Posted February 14, 2006 Probably best to make an entire new image and write the DOS files to that. To make the change, I replaced a call to $E456 (CIO call) in the DUP.SYS code. Then I just appended code to the end of the DUP which does the colour changes, then altered the start of the file (load end address pointer). The JMP $E456 is at $3D7C, changed to JMP $4332, code to store colours is there. Just hope that the DOS is smart enough to adjust it's memory pointers upwards by the extra length I put into the DUP file. Quote Link to comment Share on other sites More sharing options...
krupkaj Posted February 14, 2006 Share Posted February 14, 2006 BTW there is source code for MYDOS available at Mathy's web. Quote Link to comment Share on other sites More sharing options...
Rybags Posted February 14, 2006 Share Posted February 14, 2006 I suspect that despite the DUP file I patched having the right pointers that the DOS doesn't go by what the file says, but what it "knows" the length of the DUP to be. But, if the source is available, just roll your own mods for it. Quote Link to comment Share on other sites More sharing options...
crash Posted February 14, 2006 Author Share Posted February 14, 2006 So far I couldn't get this patched MyDOS to work on my system, although it could be that I need 4.54 since I'm using MyIDE. I can do a little hex editing here and there, but unfortunately the source code is still over my head :/ Thanks! Quote Link to comment Share on other sites More sharing options...
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