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Implements the 65C02 NOPs.

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This commit is contained in:
Thomas Harte 2018-08-08 20:00:14 -04:00
parent e46bde35f5
commit e3f6da6994
4 changed files with 32 additions and 2 deletions
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2
OSBindings/Mac/Clock SignalTests/KlausDormannTests.swift
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@ -76,6 +76,8 @@ class KlausDormannTests: XCTestCase {
case 0x0730: return "BBS: branch not taken"
case 0x0733: return "BBR: branch taken"
case 0x2884: return "JMP (abs) exhibited 6502 page-crossing bug"
case 0: return "Didn't find tests"
default: return "Unknown error at \(String(format:"%04x", address))"
}

3
Processors/6502/6502.hpp
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@ -204,7 +204,7 @@ template <typename T, bool uses_ready_line> class Processor: public ProcessorBas
/*!
Constructs an instance of the 6502 that will use @c bus_handler for all bus communications.
*/
Processor(Personality personality, T &bus_handler) : ProcessorBase(personality), bus_handler_(bus_handler) {}
Processor(Personality personality, T &bus_handler) : ProcessorBase(personality), personality_(personality), bus_handler_(bus_handler) {}
/*!
Runs the 6502 for a supplied number of cycles.
@ -221,6 +221,7 @@ template <typename T, bool uses_ready_line> class Processor: public ProcessorBas
void set_ready_line(bool active);
private:
Personality personality_;
T &bus_handler_;
};

11
Processors/6502/Implementation/6502Implementation.hpp
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@ -93,7 +93,16 @@ if(number_of_cycles <= Cycles(0)) break;
} break;
case CycleFetchOperand:
read_mem(operand_, pc_.full);
if(
personality_ == P6502 ||
(operation_&7) != 3 ||
operation_ == 0xcb ||
operation_ == 0xdb
) {
read_mem(operand_, pc_.full);
} else {
printf("Skipping %02x\n", operation_);
}
break;
case OperationDecodeOperation:

18
Processors/6502/Implementation/6502Storage.cpp
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@ -242,6 +242,24 @@ ProcessorStorage::ProcessorStorage(Personality personality) {
for(int location = 0x0f; location <= 0xff; location += 0x10) {
Install(location, Program(OperationLoadAddressZeroPage, CycleFetchOperandFromAddress, OperationBBRBBS));
}
// Add NOPs.
// The 1-byte, 1-cycle (!) NOPs.
for(int c = 0x03; c <= 0xf3; c += 0x10) {
Install(c, ImpliedNop());
}
for(int c = 0x0b; c <= 0xbb; c += 0x10) {
Install(c, ImpliedNop());
}
for(int c = 0xeb; c <= 0xfb; c += 0x10) {
Install(c, ImpliedNop());
}
// The 2-byte, 2-cycle NOPs that the 6502 doesn't have.
for(int c = 0x02; c <= 0x62; c += 0x10) {
Install(c, ImmediateNop());
}
}
#undef Install
}