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Merge pull request #5081 from JoakimLarsson/diablo_5

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WIP diablo1300.cpp: Fixed conditional jump JNC and table rom offset f…
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Joakim Larsson Edström 2019-05-19 21:12:49 +02:00 committed by GitHub
commit 106558dd73
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 6 additions and 3 deletions
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9
src/devices/cpu/diablo/diablo1300.cpp
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@ -238,7 +238,7 @@ void diablo1300_cpu_device::execute_run()
write_port((op & 0x0070) >> 4, m_a);
break;
case 1:
/* JNC Addr: Set PC to address H AAAA AAAA, reg B and carry are cleared
/* JNC Addr: If carry not set: set PC to address H AAAA AAAA, reg B and carry are cleared
AAAA AAAA 0000 HIII
AAAA AAAA = 8 low bits in Destination Address
H = The 9th hi address bit
@ -247,8 +247,11 @@ void diablo1300_cpu_device::execute_run()
LOGOP("JNC %03X\n", ((op & 0xff00) >> 8) + ((op & 0x0008) ? 0x100 : 0));
m_a = (op & 0xff00) >> 8;
m_b = 0;
if (m_carry == 0)
{
m_pc = ((op & 0x0008) + m_a);
}
m_carry = 0;
m_pc = ((op & 0x0008) + m_a);
break;
case 2:
/* RST Dport : Reset Port
@ -290,7 +293,7 @@ void diablo1300_cpu_device::execute_run()
*/
LOGOP("XLAT r%02X\n",
((op & 0x00f0) >> 4) + ((op & 0x0008) ? 0x10 : 0));
m_a = read_table(m_b + m_carry);
m_a = read_table(m_b + (m_carry != 0 ? 0x100 : 0x000));
m_b = 0;
m_carry = 0;
write_reg(((op & 0x0008) != 0 ? 0x10 : 0) + ((op & 0x00f0) >> 4), m_a);