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Add basic delay to a few dos games to improve their timing. TSR use global psp. (rc3 changes)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3589
This commit is contained in:
Peter Veenstra 2010-05-02 07:16:15 +00:00
parent 685c253690
commit cc6785acea
2 changed files with 34 additions and 2 deletions
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8
src/cpu/callback.cpp
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@ -423,7 +423,13 @@ Bitu CALLBACK_SetupExtra(Bitu callback, Bitu type, PhysPt physAddress, bool use_
}
phys_writeb(physAddress+0x01,(Bit8u)0xCF); //An IRET Instruction
phys_writeb(physAddress+0x02,(Bit8u)0xCB); //A RETF Instruction
return (use_cb?7:3);
phys_writeb(physAddress+0x03,(Bit8u)0x51); // push cx
phys_writeb(physAddress+0x04,(Bit8u)0xB9); // mov cx,
phys_writew(physAddress+0x05,(Bit16u)0x0140); // 0x140
phys_writew(physAddress+0x07,(Bit16u)0xFEE2); // loop $-2
phys_writeb(physAddress+0x09,(Bit8u)0x59); // pop cx
phys_writeb(physAddress+0x0A,(Bit8u)0xCF); //An IRET Instruction
return (use_cb?15:11);
default:
E_Exit("CALLBACK:Setup:Illegal type %d",type);

28
src/dos/dos.cpp
View file

@ -44,7 +44,10 @@ void DOS_SetError(Bit16u code) {
#define DATA_TRANSFERS_TAKE_CYCLES 1
#ifdef DATA_TRANSFERS_TAKE_CYCLES
#ifndef DOSBOX_CPU_H
#include "cpu.h"
#endif
static inline void modify_cycles(Bits value) {
if((4*value+5) < CPU_Cycles) {
CPU_Cycles -= 4*value;
@ -59,6 +62,20 @@ static inline void modify_cycles(Bits /* value */) {
return;
}
#endif
#define DOS_OVERHEAD 1
#ifdef DOS_OVERHEAD
#ifndef DOSBOX_CPU_H
#include "cpu.h"
#endif
static inline void overhead() {
reg_ip += 2;
}
#else
static inline void overhead() {
return;
}
#endif
#define DOSNAMEBUF 256
static Bitu DOS_21Handler(void) {
@ -121,6 +138,9 @@ static Bitu DOS_21Handler(void) {
switch (reg_dl) {
case 0xFF: /* Input */
{
//Simulate DOS overhead for timing sensitive games
//MM1
overhead();
//TODO Make this better according to standards
if (!DOS_GetSTDINStatus()) {
reg_al=0;
@ -201,6 +221,9 @@ static Bitu DOS_21Handler(void) {
case 0x0b: /* Get STDIN Status */
if (!DOS_GetSTDINStatus()) {reg_al=0x00;}
else {reg_al=0xFF;}
//Simulate some overhead for timing issues
//Tankwar menu (needs maybe even more)
overhead();
break;
case 0x0c: /* Flush Buffer and read STDIN call */
{
@ -369,6 +392,9 @@ static Bitu DOS_21Handler(void) {
reg_dh=(Bit8u)(seconds % 60);
reg_dl=(Bit8u)(ticks % 100);
}
//Simulate DOS overhead for timing-sensitive games
//Robomaze 2
overhead();
break;
case 0x2d: /* Set System Time */
LOG(LOG_DOSMISC,LOG_ERROR)("DOS:Set System Time not supported");
@ -1061,7 +1087,7 @@ static Bitu DOS_20Handler(void) {
static Bitu DOS_27Handler(void) {
// Terminate & stay resident
Bit16u para = (reg_dx/16)+((reg_dx % 16)>0);
Bit16u psp = mem_readw(SegPhys(ss)+reg_sp+2);
Bit16u psp = dos.psp(); //mem_readw(SegPhys(ss)+reg_sp+2);
if (DOS_ResizeMemory(psp,&para)) DOS_Terminate(psp,true,0);
return CBRET_NONE;
}