valter/dosbox-staging
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Correct stack pointer for COM format programs when there is less than 64K of memory available. Fixes Corncob 3D issue reported in bug #443.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3988
This commit is contained in:
ripsaw8080 2016-06-22 16:29:13 +00:00
parent c898d14351
commit 2b837cf6fb
1 changed files with 5 additions and 2 deletions
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7
src/dos/dos_execute.cpp
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@ -419,8 +419,11 @@ bool DOS_Execute(char * name,PhysPt block_pt,Bit8u flags) {
RealPt csip,sssp;
if (iscom) {
csip=RealMake(pspseg,0x100);
sssp=RealMake(pspseg,0xfffe);
mem_writew(PhysMake(pspseg,0xfffe),0);
if (memsize<0x1000) {
LOG(LOG_EXEC,LOG_WARN)("COM format with only %X paragraphs available",memsize);
sssp=RealMake(pspseg,(memsize<<4)-2);
} else sssp=RealMake(pspseg,0xfffe);
mem_writew(Real2Phys(sssp),0);
} else {
csip=RealMake(loadseg+head.initCS,head.initIP);
sssp=RealMake(loadseg+head.initSS,head.initSP);