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No response from MSCDEX when it's not installed/active. Allows install programs from the V for Victory series of games to work provided no cdrom drives are mounted.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3897
This commit is contained in:
ripsaw8080 2015-02-11 17:46:12 +00:00
parent 6cec6d144b
commit f458d07983
1 changed files with 10 additions and 7 deletions
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17
src/dos/dos_mscdex.cpp
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@ -1158,12 +1158,14 @@ static Bitu MSCDEX_Interrupt_Handler(void) {
static bool MSCDEX_Handler(void) {
if(reg_ah == 0x11) {
if(reg_al == 0x00) {
PhysPt check = PhysMake(SegValue(ss),reg_sp);
if(mem_readw(check+6) == 0xDADA) {
//MSCDEX sets word on stack to ADAD if it DADA on entry.
mem_writew(check+6,0xADAD);
if (mscdex->GetNumDrives()>0) {
PhysPt check = PhysMake(SegValue(ss),reg_sp);
if(mem_readw(check+6) == 0xDADA) {
//MSCDEX sets word on stack to ADAD if it DADA on entry.
mem_writew(check+6,0xADAD);
}
reg_al = 0xff;
}
reg_al = 0xff;
return true;
} else {
LOG(LOG_MISC,LOG_ERROR)("NETWORK REDIRECTOR USED!!!");
@ -1174,6 +1176,7 @@ static bool MSCDEX_Handler(void) {
}
if (reg_ah!=0x15) return false; // not handled here, continue chain
if (mscdex->GetNumDrives()==0) return true; // do nothing if MSCDEX not active
PhysPt data = PhysMake(SegValue(es),reg_bx);
MSCDEX_LOG("MSCDEX: INT 2F %04X BX= %04X CX=%04X",reg_ax,reg_bx,reg_cx);
@ -1181,7 +1184,7 @@ static bool MSCDEX_Handler(void) {
case 0x1500: /* Install check */
reg_bx = mscdex->GetNumDrives();
if (reg_bx>0) reg_cx = mscdex->GetFirstDrive();
reg_cx = mscdex->GetFirstDrive();
reg_al = 0xff;
return true;
case 0x1501: /* Get cdrom driver info */
@ -1287,7 +1290,7 @@ static bool MSCDEX_Handler(void) {
}
return true;
};
LOG(LOG_MISC,LOG_ERROR)("MSCDEX: Unknwon call : %04X",reg_ax);
LOG(LOG_MISC,LOG_ERROR)("MSCDEX: Unknown call : %04X",reg_ax);
return true;
}