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faster resume of tandy DAC playing after stop request (Outrun)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2420
This commit is contained in:
Sebastian Strohhäcker 2005-12-20 21:33:02 +00:00
parent 60be22c0ed
commit 15455827d9
1 changed files with 8 additions and 2 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 1.54 2005-12-17 16:28:18 c2woody Exp $ */
/* $Id: bios.cpp,v 1.55 2005-12-20 21:33:02 c2woody Exp $ */
#include "dosbox.h"
#include "mem.h"
@ -119,8 +119,13 @@ static bool Tandy_TransferInProgress(void) {
if (real_readb(0x40,0xd4)==0xff) return false; /* still in init-state */
IO_Write(0x0c,0x00);
Bit16u datalen=IO_ReadB(tandy_sb.dma*2+1)|(IO_ReadB(tandy_sb.dma*2+1)<<8);
Bit16u datalen=IO_ReadB(tandy_sb.dma*2+1);
datalen|=(IO_ReadB(tandy_sb.dma*2+1)<<8);
if (datalen==0xffff) return false; /* no DMA transfer */
else if ((datalen<0x10) && (real_readb(0x40,0xd4)==0x0f) && (real_readw(0x40,0xd2)==0x1c)) {
/* stop already requested */
return false;
}
return true;
}
@ -137,6 +142,7 @@ static void Tandy_SetupTransfer(PhysPt bufpt,bool isplayback) {
RealSetVec(tandy_sb.irq+8,tandy_DAC_callback->Get_RealPointer());
}
IO_Write(tandy_sb.port+0xc,0xd0); /* stop DMA transfer */
IO_Write(0x21,IO_Read(0x21)&(~(1<<tandy_sb.irq))); /* unmask IRQ */
IO_Write(tandy_sb.port+0xc,0xd1); /* turn speaker on */
IO_Write(0x0a,0x04|tandy_sb.dma); /* mask DMA channel */