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correct AX and BX, they contain information on the existence of the drives specified in the FCBs in the execute block.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3941
This commit is contained in:
Peter Veenstra 2015-10-02 20:16:28 +00:00
parent cf9f8b2d3e
commit 34cc2d6428
1 changed files with 11 additions and 1 deletions
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12
src/dos/dos_execute.cpp
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@ -462,6 +462,16 @@ bool DOS_Execute(char * name,PhysPt block_pt,Bit8u flags) {
/* copy fcbs */
newpsp.SetFCB1(block.exec.fcb1);
newpsp.SetFCB2(block.exec.fcb2);
/* Setup ax and bx, they contain a 0xff in al and ah if the drive in the fcb is not valid */
DOS_FCB fcb1(RealSeg(block.exec.fcb1),RealOff(block.exec.fcb1));
DOS_FCB fcb2(RealSeg(block.exec.fcb2),RealOff(block.exec.fcb2));
Bit8u d1 = fcb1.GetDrive(); //depends on 0 giving the dos.default drive
if ( (d1>=DOS_DRIVES) || !Drives[d1] ) reg_bl = 0xFF; else reg_bl = 0;
Bit8u d2 = fcb2.GetDrive();
if ( (d2>=DOS_DRIVES) || !Drives[d2] ) reg_bh = 0xFF; else reg_bh = 0;
reg_ax = reg_bx;
/* Set the stack for new program */
SegSet16(ss,RealSeg(sssp));reg_sp=RealOff(sssp);
/* Add some flags and CS:IP on the stack for the IRET */
@ -474,7 +484,7 @@ bool DOS_Execute(char * name,PhysPt block_pt,Bit8u flags) {
//Jump to retf so that we only need to store cs:ip on the stack
reg_ip++;
/* Setup the rest of the registers */
reg_ax=reg_bx=0;reg_cx=0xff;
reg_cx=0xff;
reg_dx=pspseg;
reg_si=RealOff(csip);
reg_di=RealOff(sssp);