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HP9000/300: fix detection of DIO cards

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Install a buserror handler for the DIO/DIO-II card ranges. The
300 BOOT ROM expects to get a Buserror signal to detect if there's
a card. Also remove that memory of PC's doing invalid Bus accesses
as this breaks this detection.

Signed-off-by: Sven Schnelle <svens@stackframe.org>
This commit is contained in:
Sven Schnelle 2017-09-03 22:32:05 +02:00
parent 49a7303d0f
commit a79a9ca59d
1 changed files with 5 additions and 27 deletions
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32
src/mame/drivers/hp9k_3xx.cpp
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@ -116,7 +116,6 @@ public:
private:
bool m_in_buserr;
uint32_t m_last_buserr_pc;
};
uint32_t hp9k3xx_state::hp_medres_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
@ -154,6 +153,10 @@ static ADDRESS_MAP_START(hp9k3xx_common, AS_PROGRAM, 32, hp9k3xx_state)
AM_RANGE(0x00510000, 0x00510003) AM_READWRITE(buserror_r, buserror_w) // no "Alpha display"
AM_RANGE(0x00538000, 0x00538003) AM_READWRITE(buserror_r, buserror_w) // no "Graphics"
AM_RANGE(0x005c0000, 0x005c0003) AM_READWRITE(buserror_r, buserror_w) // no add-on FP coprocessor
AM_RANGE(0x00600000, 0x007fffff) AM_READWRITE(buserror_r, buserror_w) // prevent reading invalid DIO slots
AM_RANGE(0x01000000, 0x1fffffff) AM_READWRITE(buserror_r, buserror_w) // prevent reading invalid DIO-II slots
AM_RANGE(0x005f8000, 0x005f800f) AM_DEVREADWRITE8(PTM6840_TAG, ptm6840_device, read, write, 0x00ff00ff)
ADDRESS_MAP_END
@ -166,7 +169,7 @@ static ADDRESS_MAP_START(hp9k310_map, AS_PROGRAM, 16, hp9k3xx_state)
AM_RANGE(0x5c0000, 0x5c0003) AM_READWRITE(buserror16_r, buserror16_w) // no add-on FP coprocessor
AM_RANGE(0x5f8000, 0x5f800f) AM_DEVREADWRITE8(PTM6840_TAG, ptm6840_device, read, write, 0x00ff)
AM_RANGE(0x600000, 0x7ffffd) AM_READWRITE(buserror16_r, buserror16_w) // prevent reading invalid DIO slots
AM_RANGE(0x700000, 0x7fffff) AM_READWRITE(buserror16_r, buserror16_w)
AM_RANGE(0x800000, 0xffffff) AM_RAM
ADDRESS_MAP_END
@ -242,76 +245,51 @@ INPUT_PORTS_END
void hp9k3xx_state::machine_reset()
{
m_in_buserr = false;
m_last_buserr_pc = 0;
}
READ16_MEMBER(hp9k3xx_state::buserror16_r)
{
if (m_last_buserr_pc == space.device().safe_pc())
{
return 0;
}
if (!m_in_buserr)
{
m_in_buserr = true;
m_maincpu->set_input_line(M68K_LINE_BUSERROR, ASSERT_LINE);
m_maincpu->set_input_line(M68K_LINE_BUSERROR, CLEAR_LINE);
m_in_buserr = false;
m_last_buserr_pc = space.device().safe_pc();
}
return 0;
}
WRITE16_MEMBER(hp9k3xx_state::buserror16_w)
{
if (m_last_buserr_pc == space.device().safe_pc())
{
return;
}
if (!m_in_buserr)
{
m_in_buserr = true;
m_maincpu->set_input_line(M68K_LINE_BUSERROR, ASSERT_LINE);
m_maincpu->set_input_line(M68K_LINE_BUSERROR, CLEAR_LINE);
m_in_buserr = false;
m_last_buserr_pc = space.device().safe_pc();
}
}
READ32_MEMBER(hp9k3xx_state::buserror_r)
{
if (m_last_buserr_pc == space.device().safe_pc())
{
return 0;
}
if (!m_in_buserr)
{
m_in_buserr = true;
m_maincpu->set_input_line(M68K_LINE_BUSERROR, ASSERT_LINE);
m_maincpu->set_input_line(M68K_LINE_BUSERROR, CLEAR_LINE);
m_in_buserr = false;
m_last_buserr_pc = space.device().safe_pc();
}
return 0;
}
WRITE32_MEMBER(hp9k3xx_state::buserror_w)
{
if (m_last_buserr_pc == space.device().safe_pc())
{
return;
}
if (!m_in_buserr)
{
m_in_buserr = true;
m_maincpu->set_input_line(M68K_LINE_BUSERROR, ASSERT_LINE);
m_maincpu->set_input_line(M68K_LINE_BUSERROR, CLEAR_LINE);
m_in_buserr = false;
m_last_buserr_pc = space.device().safe_pc();
}
}