vollmer@ttidca.TTI.COM (Jim Vollmer) (10/05/87)
Help, I need a program which can make MS/PC DOS think that there is less memory then there really is. I need this program to run on an IBM XT or AT, with PC-DOS 3.1. What I have tried is: 1) Change the word at 40:13 to indicate that there is less memory in the system 2) Reboot DOS without doing diagnostics An example of this to remove 64K bytes for the system is as follows: mov ax,40H mov es,ax ;set up the segment sub es:[13H],64 ;decrement the amount of memory int 25 ;do a BIOS reboot This works on PC-DOS 2.1. But not on DOS 3.1. What I get is a partial boot but, 1) If I have VDISK installed it hangs 2) It hanges when the display is forced to scroll 3) It hanges before the dos prompt is displayed Does this mean that the DOS dos not fully initialize its environment? Is there any other way to accomplish it? Thanks Jim R. Vollmer