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Merge pull request #578 from TomHarte/SMSBIOSFallback

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Attempts to carry on even if no BIOS is found.
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Thomas Harte 2018-10-26 21:20:43 -04:00 committed by GitHub
commit 4af0b74a42
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1 changed files with 7 additions and 4 deletions
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11
Machines/MasterSystem/MasterSystem.cpp
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@ -25,6 +25,7 @@
#include "../../Analyser/Static/Sega/Target.hpp" #include "../../Analyser/Static/Sega/Target.hpp"
#include <algorithm> #include <algorithm>
#include <iostream>
namespace { namespace {
const int sn76489_divider = 2; const int sn76489_divider = 2;
@ -132,11 +133,13 @@ class ConcreteMachine:
if(has_bios()) { if(has_bios()) {
const auto roms = rom_fetcher("MasterSystem", {"bios.sms"}); const auto roms = rom_fetcher("MasterSystem", {"bios.sms"});
if(!roms[0]) { if(!roms[0]) {
throw ROMMachine::Error::MissingROMs; // No BIOS found; attempt to boot as though it has already disabled itself.
memory_control_ |= 0x08;
std::cerr << "No BIOS found; attempting to start cartridge directly" << std::endl;
} else {
roms[0]->resize(8*1024);
memcpy(&bios_, roms[0]->data(), roms[0]->size());
} }
roms[0]->resize(8*1024);
memcpy(&bios_, roms[0]->data(), roms[0]->size());
} }
// Map RAM. // Map RAM.