[comp.sys.ibm.pc] how to print screen

ross@isis.UUCP (Ross McConnell) (07/21/87)

I'm sure that this has been answered before, but ...

  How do you cause a graphics screen dump from inside a 
program on an AT. For example, I want to simulate the effect
of a <SHIFT PRT SCRN 0> which dumps Page 0 from my Herc card.
I imagine that you use BIOS INT 5H, but how do you tell the BIOS
which page to dump?