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Make effect of I/O delay more consistent as cycles run out. Prevents flickering in NBA Jam Tournament Edition at higher cycles, and also improves automatic speed limiting in Quake.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@4215
This commit is contained in:
ripsaw8080 2019-04-20 22:59:42 +00:00
parent 911cc38865
commit 139456b2d0
1 changed files with 2 additions and 2 deletions
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4
src/hardware/iohandler.cpp
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@ -208,14 +208,14 @@ inline void IO_USEC_write_delay_old() {
inline void IO_USEC_read_delay() {
Bits delaycyc = CPU_CycleMax/IODELAY_READ_MICROSk;
if(GCC_UNLIKELY(CPU_Cycles < 3*delaycyc)) delaycyc = 0; //Else port acces will set cycles to 0. which might trigger problem with games which read 16 bit values
if(GCC_UNLIKELY(delaycyc > CPU_Cycles)) delaycyc = CPU_Cycles;
CPU_Cycles -= delaycyc;
CPU_IODelayRemoved += delaycyc;
}
inline void IO_USEC_write_delay() {
Bits delaycyc = CPU_CycleMax/IODELAY_WRITE_MICROSk;
if(GCC_UNLIKELY(CPU_Cycles < 3*delaycyc)) delaycyc=0;
if(GCC_UNLIKELY(delaycyc > CPU_Cycles)) delaycyc = CPU_Cycles;
CPU_Cycles -= delaycyc;
CPU_IODelayRemoved += delaycyc;
}