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genene: Fix PFM regression from last rewrite (nw)

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This commit is contained in:
Michael Zapf 2019-12-27 22:03:58 +01:00
parent ddd03fe9d6
commit b4630614f0
2 changed files with 14 additions and 5 deletions
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3
src/devices/bus/ti99/internal/genboard.cpp
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@ -924,8 +924,9 @@ READ_LINE_MEMBER(geneve_gate_array_device::csr_out)
READ_LINE_MEMBER(geneve_gate_array_device::romen_out)
{
// Do not restrict to read-only, as we could have a PFM here
decdata* dec = (m_debug)? &m_decdebug : &m_decoded;
return ((dec->function == MPEPROM) && dec->read)? ASSERT_LINE : CLEAR_LINE;
return (dec->function == MPEPROM)? ASSERT_LINE : CLEAR_LINE;
}
READ_LINE_MEMBER(geneve_gate_array_device::ramen_out)

16
src/mame/drivers/geneve.cpp
View File

@ -314,7 +314,8 @@ private:
required_device<at29c040_device> m_pfm512;
required_device<at29c040a_device> m_pfm512a;
void read_eprom_or_pfm(offs_t offset, uint8_t& value);
DECLARE_WRITE8_MEMBER( write_pfm );
void write_pfm(offs_t offset, uint8_t data);
DECLARE_WRITE_LINE_MEMBER( pfm_a17 );
DECLARE_WRITE_LINE_MEMBER( pfm_a18 );
DECLARE_WRITE_LINE_MEMBER( pfm_oe );
@ -675,6 +676,10 @@ WRITE8_MEMBER( geneve_state::memwrite )
m_sound->write(data);
}
// Boot ROM or PFM (normal and Genmod)
if (m_gatearray->romen_out()==ASSERT_LINE)
write_pfm(offset, data);
// Stock SRAM 32K
if (m_gatearray->ramen_out()==ASSERT_LINE)
{
@ -774,22 +779,25 @@ void geneve_state::read_eprom_or_pfm(offs_t offset, uint8_t& value)
}
}
WRITE8_MEMBER( geneve_state::write_pfm )
void geneve_state::write_pfm(offs_t offset, uint8_t data)
{
// Nota bene: The PFM must be write protected on startup, or the RESET
// of the 9995 will attempt to write the return vector into the flash EEPROM
offs_t addr13 = offset & 0x1fff;
int pfmaddress = addr13 | m_gatearray->get_prefix(AMA | AB0 | AB1 | AB2) | m_pfm_prefix;
LOGMASKED(LOG_PFM, "Writing to PFM at address %05x <- %02x\n", pfmaddress, data);
switch (m_boot_rom)
{
case GENEVE_EPROM:
LOGMASKED(LOG_WARN, "Write to EPROM at %05x ignored\n");
break;
case GENEVE_PFM512:
m_pfm512->write(pfmaddress, data);
LOGMASKED(LOG_PFM, "PFM %05x <- %02x\n", pfmaddress, data);
break;
case GENEVE_PFM512A:
m_pfm512a->write(pfmaddress, data);
LOGMASKED(LOG_PFM, "PFM %05x <- %02x\n", pfmaddress, data);
break;
default:
LOGMASKED(LOG_WARN, "Illegal mode for writing to PFM: %d\n", m_boot_rom);