f6ef1f833c
Thoroughly clean up the code to vastly reduce the number of compiler warnings and found and fixed several bugs in the process; Applied all mainline PCem commits; Added SCSI hard disk emulation; Commented out all unfinished machines and graphics cards; Added the AOpen AP53 and ASUS P/I-P55T2 machines as well as another Tyan 440FX machine, all three with AMI WinBIOS (patch from TheCollector1995); Added the Diamond Stealth 3D 3000 (S3 ViRGE/VX) graphics card (patch from TheCollector1995); Added the PS/2 XT IDE (AccuLogic) HDD Controller (patch from TheCollector1995); Added Microsoft/Logitech Bus Mouse emulation (patch from waltje); Overhauled the makefiles (patch from waltje); Added the Adaptec AHA-1542CF SCSI controller (patch from waltje); Added preliminary (but still unfinished) Adaptec AHA-154x SCSI controller BIOS support (patch from waltje); Added an ISABugger debugging device (patch from waltje); Added sanity checks to the Direct3D code.
32 lines
712 B
C
32 lines
712 B
C
/*INTEL 82355 MCR emulation
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This chip was used as part of many 386 chipsets
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It controls memory addressing and shadowing*/
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#include "ibm.h"
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int nextreg6;
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uint8_t mcr22;
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int mcrlock,mcrfirst;
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void resetmcr()
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{
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mcrlock=0;
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mcrfirst=1;
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shadowbios=0;
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}
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void writemcr(uint16_t addr, uint8_t val)
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{
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printf("Write MCR %04X %02X %04X:%04X\n",addr,val,CS,cpu_state.pc);
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switch (addr)
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{
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case 0x22:
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if (val==6 && mcr22==6) nextreg6=1;
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else nextreg6=0;
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break;
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case 0x23:
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if (nextreg6) shadowbios=!val;
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break;
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}
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mcr22=val;
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}
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