valter/dosbox-staging
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The emulated floppy drive does not use DMA, but make it look like it does when booting. Fixes CGA graphics in the Demon's Forge booter.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3879
This commit is contained in:
ripsaw8080 2015-01-06 16:51:22 +00:00
parent 0f4c92ca32
commit 92ca5488b9
1 changed files with 6 additions and 1 deletions
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7
src/dos/dos_programs.cpp
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@ -36,6 +36,8 @@
#include "bios_disk.h"
#include "setup.h"
#include "control.h"
#include "inout.h"
#include "dma.h"
#if defined(OS2)
@ -590,7 +592,7 @@ public:
FILE *usefile_1=NULL;
FILE *usefile_2=NULL;
Bitu i=0;
Bit32u floppysize;
Bit32u floppysize=0;
Bit32u rombytesize_1=0;
Bit32u rombytesize_2=0;
Bit8u drive = 'A';
@ -825,6 +827,9 @@ public:
WriteOut(MSG_Get("PROGRAM_BOOT_BOOT"), drive);
for(i=0;i<512;i++) real_writeb(0, 0x7c00 + i, bootarea.rawdata[i]);
/* create appearance of floppy drive DMA usage (Demon's Forge) */
if (!IS_TANDY_ARCH && floppysize!=0) GetDMAChannel(2)->tcount=true;
/* revector some dos-allocated interrupts */
real_writed(0,0x01*4,0xf000ff53);
real_writed(0,0x03*4,0xf000ff53);