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cosmac: Fix disassembly; very minor cleanup (nw)

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This commit is contained in:
AJR 2018-07-13 20:03:27 -04:00
parent 2c7e42261a
commit aeab957b52
3 changed files with 12 additions and 14 deletions
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2
src/devices/cpu/cosmac/cosdasm.cpp
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@ -35,7 +35,7 @@ offs_t cosmac_disassembler::short_branch(offs_t base_pc, offs_t &pc, const data_
offs_t cosmac_disassembler::long_branch(offs_t &pc, const data_buffer &params)
{
u16 res = params.r16(pc);
u16 res = params.r8(pc) << 8 | params.r8(pc + 1);
pc += 2;
return res;
}

18
src/devices/cpu/cosmac/cosmac.cpp
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@ -161,7 +161,7 @@ const cosmac_device::ophandler cdp1801_device::s_opcodetable[256] =
&cdp1801_device::adi, &cdp1801_device::sdi, &cdp1801_device::und, &cdp1801_device::smi
};
cosmac_device::ophandler cdp1801_device::get_ophandler(uint8_t opcode)
cosmac_device::ophandler cdp1801_device::get_ophandler(uint8_t opcode) const
{
return s_opcodetable[opcode];
}
@ -249,7 +249,7 @@ const cosmac_device::ophandler cdp1802_device::s_opcodetable[256] =
&cdp1802_device::adi, &cdp1802_device::sdi, &cdp1802_device::shl, &cdp1802_device::smi
};
cosmac_device::ophandler cdp1802_device::get_ophandler(uint8_t opcode)
cosmac_device::ophandler cdp1802_device::get_ophandler(uint8_t opcode) const
{
return s_opcodetable[opcode];
}
@ -828,8 +828,8 @@ inline void cosmac_device::set_q_flag(int state)
inline void cosmac_device::fetch_instruction()
{
// instruction fetch
m_op = read_opcode(R[P]);
R[P]++;
offs_t addr = R[P]++;
m_op = read_opcode(addr);
I = m_op >> 4;
N = m_op & 0x0f;
@ -919,9 +919,8 @@ inline void cosmac_device::execute_instruction()
inline void cosmac_device::dma_input()
{
RAM_W(R[0], m_read_dma(R[0]));
R[0]++;
offs_t addr = R[0]++;
RAM_W(addr, m_read_dma(addr));
m_icount -= CLOCKS_DMA;
@ -956,9 +955,8 @@ inline void cosmac_device::dma_input()
inline void cosmac_device::dma_output()
{
m_write_dma((offs_t)R[0], RAM_R(R[0]));
R[0]++;
offs_t addr = R[0]++;
m_write_dma(addr, RAM_R(addr));
m_icount -= CLOCKS_DMA;

6
src/devices/cpu/cosmac/cosmac.h
View File

@ -441,7 +441,7 @@ protected:
// opcode/condition tables
typedef void (cosmac_device::*ophandler)();
virtual cosmac_device::ophandler get_ophandler(uint8_t opcode) = 0;
virtual cosmac_device::ophandler get_ophandler(uint8_t opcode) const = 0;
};
@ -457,7 +457,7 @@ protected:
// device_disasm_interface overrides
virtual std::unique_ptr<util::disasm_interface> create_disassembler() override;
virtual cosmac_device::ophandler get_ophandler(uint8_t opcode) override;
virtual cosmac_device::ophandler get_ophandler(uint8_t opcode) const override;
static const ophandler s_opcodetable[256];
};
@ -475,7 +475,7 @@ protected:
// device_disasm_interface overrides
virtual std::unique_ptr<util::disasm_interface> create_disassembler() override;
virtual cosmac_device::ophandler get_ophandler(uint8_t opcode) override;
virtual cosmac_device::ophandler get_ophandler(uint8_t opcode) const override;
static const ophandler s_opcodetable[256];
};