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ti99: Fixed debugger interference with cartridge selection line.

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This commit is contained in:
Michael Zapf 2018-01-11 22:28:45 +01:00
parent 13b75ab76a
commit b8632487b8
2 changed files with 16 additions and 6 deletions
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18
src/devices/bus/ti99/internal/datamux.cpp
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@ -94,6 +94,8 @@ datamux_device::datamux_device(const machine_config &mconfig, const char *tag, d
m_sysready(CLEAR_LINE),
m_latch(0),
m_waitcount(0),
m_romgq_state(CLEAR_LINE),
m_memen_state(CLEAR_LINE),
m_use32k(false),
m_base32k(0),
m_console_groms_present(false),
@ -147,6 +149,7 @@ void datamux_device::read_all(address_space& space, uint16_t addr, uint8_t *valu
// I/O port gets all accesses
m_ioport->readz(space, addr, value);
m_ioport->memen_in(CLEAR_LINE);
m_memen_state = CLEAR_LINE;
}
void datamux_device::write_all(address_space& space, uint16_t addr, uint8_t value)
@ -183,6 +186,7 @@ void datamux_device::write_all(address_space& space, uint16_t addr, uint8_t valu
// I/O port gets all accesses
m_ioport->write(space, addr, value);
m_ioport->memen_in(CLEAR_LINE);
m_memen_state = CLEAR_LINE;
}
void datamux_device::setaddress_all(address_space& space, uint16_t addr)
@ -215,10 +219,12 @@ void datamux_device::setaddress_all(address_space& space, uint16_t addr)
// Sound chip and video chip do not require the address to be set before access
// GROMport (ROMs)
m_gromport->romgq_line(iscartrom? ASSERT_LINE : CLEAR_LINE);
m_romgq_state = iscartrom? ASSERT_LINE : CLEAR_LINE;
m_gromport->romgq_line(m_romgq_state);
// I/O port gets all accesses
m_ioport->memen_in(ASSERT_LINE);
m_memen_state = ASSERT_LINE;
m_ioport->memen_in(m_memen_state);
m_ioport->setaddress_dbin(space, addr, m_dbin);
}
@ -261,12 +267,12 @@ uint16_t datamux_device::debugger_read(address_space& space, uint16_t addr)
m_gromport->romgq_line(ASSERT_LINE);
m_gromport->readz(space, addrb+1, &lval);
m_gromport->readz(space, addrb, &hval);
m_gromport->romgq_line(CLEAR_LINE);
m_gromport->romgq_line(m_romgq_state); // reset to previous state
}
m_ioport->memen_in(ASSERT_LINE);
m_ioport->readz(space, addrb+1, &lval);
m_ioport->readz(space, addrb, &hval);
m_ioport->memen_in(CLEAR_LINE);
m_ioport->memen_in(m_memen_state); // reset to previous state
value = ((hval << 8)&0xff00) | (lval & 0xff);
}
}
@ -306,13 +312,13 @@ void datamux_device::debugger_write(address_space& space, uint16_t addr, uint16_
m_gromport->romgq_line(ASSERT_LINE);
m_gromport->write(space, addr+1, data & 0xff);
m_gromport->write(space, addr, (data>>8) & 0xff);
m_gromport->romgq_line(CLEAR_LINE);
m_gromport->romgq_line(m_romgq_state); // reset to previous state
}
m_ioport->memen_in(ASSERT_LINE);
m_ioport->write(space, addr+1, data & 0xff);
m_ioport->write(space, addr, (data>>8) & 0xff);
m_ioport->memen_in(CLEAR_LINE);
m_ioport->memen_in(m_memen_state); // reset to previous state
}
}
}

4
src/devices/bus/ti99/internal/datamux.h
View File

@ -121,6 +121,10 @@ private:
// Counter for the wait states.
int m_waitcount;
// Keep the state of the ROMG* and MEMEN* lines so that debugger does not mess up things
line_state m_romgq_state;
line_state m_memen_state;
// Use the memory expansion?
bool m_use32k;