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adjust tandy DAC transfer size

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2392
This commit is contained in:
Sebastian Strohhäcker 2005-11-24 21:11:45 +00:00
parent 340e59ff7a
commit 45f519d0c2
1 changed files with 5 additions and 5 deletions
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10
src/ints/bios.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: bios.cpp,v 1.50 2005-11-24 18:25:20 qbix79 Exp $ */
/* $Id: bios.cpp,v 1.51 2005-11-24 21:11:45 c2woody Exp $ */
#include "dosbox.h"
#include "mem.h"
@ -133,7 +133,6 @@ static void Tandy_SetupTransfer(PhysPt bufpt,bool isplayback) {
/* revector IRQ-handler if necessary */
RealPt current_irq=RealGetVec(tandy_sb.irq+8);
if (current_irq!=tandy_DAC_callback->Get_RealPointer()) {
real_writed(0x40,0xd6,current_irq);
real_writed(0x40,0xd6,current_irq);
RealSetVec(tandy_sb.irq+8,tandy_DAC_callback->Get_RealPointer());
}
@ -155,18 +154,19 @@ static void Tandy_SetupTransfer(PhysPt bufpt,bool isplayback) {
case 3: IO_Write(0x82,bufpage); break;
}
real_writeb(0x40,0xd4,bufpage);
/* calculate transfer size (respects segment boundaries) */
Bit32u tlength=length;
if (tlength+(bufpt&0xffff)>0x10000) tlength=0x10000-(bufpt&0xffff);
real_writew(0x40,0xd0,(Bit16u)(length-tlength)); /* remaining buffer length */
tlength--;
/* set transfer size */
IO_Write(tandy_sb.dma*2+1,(Bit8u)(tlength&0xff));
IO_Write(tandy_sb.dma*2+1,(Bit8u)((tlength>>8)&0xff));
IO_Write(0x0a,tandy_sb.dma); /* enable DMA channel */
real_writew(0x40,0xd0,(Bit16u)(length-tlength)); /* remaining buffer length */
Bitu delay=real_readw(0x40,0xd2)&0xfff;
/* set frequency */
IO_Write(tandy_sb.port+0xc,0x40);
IO_Write(tandy_sb.port+0xc,256-delay*100/358);