a505894a10
- 86Box's own headers go to /86box - munt's public interface goes to /mt32emu - all slirp headers go to /slirp (might want to consider using only its public inteface) - single file headers from other projects go in include root
39 lines
752 B
C
39 lines
752 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 <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <wchar.h>
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#include <86box/86box.h>
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#include <86box/mem.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(void)
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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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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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