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fixed status being reset too early

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hap 2014-12-19 23:54:04 +01:00
parent 350dd4a7d0
commit 46ca56f304
1 changed files with 11 additions and 11 deletions
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22
src/emu/cpu/tms0980/tms0980.c
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@ -1156,8 +1156,6 @@ void tms1xxx_cpu_device::execute_run()
set_cki_bus();
m_ram_in = m_data->read_byte(m_ram_address) & 0xf;
m_dam_in = m_data->read_byte(m_ram_address | (0x10 << (m_x_bits-1))) & 0xf;
m_ram_out = -1;
m_status = 1;
m_p = 0;
m_n = 0;
m_carry_in = 0;
@ -1197,11 +1195,12 @@ void tms1xxx_cpu_device::execute_run()
// note: officially, only 1 alu operation is allowed per opcode
m_adder_out = m_p + m_n + m_carry_in;
int carry_out = m_adder_out >> 4 & 1;
int status = 1;
m_ram_out = -1;
if (m_micro & M_C8) m_status &= carry_out;
if (m_micro & M_NE) m_status &= (m_n != m_p); // COMP
if (m_micro & M_CKM) m_ram_out = m_cki_bus;
if (m_micro & M_C8) status &= carry_out;
if (m_micro & M_NE) status &= (m_n != m_p); // COMP
if (m_micro & M_CKM) m_ram_out = m_cki_bus;
// special status circuit
if (m_micro & M_SSE)
@ -1233,8 +1232,9 @@ void tms1xxx_cpu_device::execute_run()
if (m_fixed & F_SAL) op_sal();
if (m_fixed & F_SBL) op_sbl();
if (m_fixed & F_XDA) op_xda();
// execute: write ram
// after fixed opcode handling: store status, write ram
m_status = status;
if (m_ram_out != -1)
m_data->write_byte(m_ram_address, m_ram_out);
@ -1248,9 +1248,9 @@ void tms1xxx_cpu_device::execute_run()
case 4:
// execute: register store 2/2
if (m_micro & M_AUTA) m_a = m_adder_out & 0xf;
if (m_micro & M_AUTY) m_y = m_adder_out & 0xf;
if (m_micro & M_STSL) m_status_latch = m_status;
if (m_micro & M_AUTA) m_a = m_adder_out & 0xf;
if (m_micro & M_AUTY) m_y = m_adder_out & 0xf;
if (m_micro & M_STSL) m_status_latch = m_status;
// fetch: update pc, ram address 2/2
read_opcode();