- store the text snapshot at the base address of the text_snapshot array again.   The old code could fail when an OS scroll with start address changes (DLX Linux) - handle the graphics controller shift register value 3 the same way as 2. We need   a test case for this setting.
- store the text snapshot at the base address of the text_snapshot array again.
  The old code could fail when an OS scroll with start address changes (DLX Linux)
- handle the graphics controller shift register value 3 the same way as 2. We need
  a test case for this setting.

marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet