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bus/spectrum/musicmachine.cpp: confirm port decoding; fix save state #12853

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merged 1 commit into from
Oct 4, 2024
Merged

bus/spectrum/musicmachine.cpp: confirm port decoding; fix save state #12853

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9 changes: 5 additions & 4 deletions src/devices/bus/spectrum/musicmachine.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,7 @@ spectrum_musicmachine_device::spectrum_musicmachine_device(const machine_config

void spectrum_musicmachine_device::device_start()
{
save_item(NAME(m_irq_select));
}

//-------------------------------------------------
Expand All @@ -75,9 +76,9 @@ u8 spectrum_musicmachine_device::iorq_r(offs_t offset)
switch (offset & 0xff)
{
case 0x7f:
if (offset == 0xfc7f)
if ((offset & 0x3ff) == 0x27f)
data = m_acia->status_r();
else
else if ((offset & 0x3ff) == 0x37f)
data = m_acia->data_r();
break;
case 0xbf:
Expand All @@ -99,9 +100,9 @@ void spectrum_musicmachine_device::iorq_w(offs_t offset, u8 data)
m_irq_select = data & 1;
break;
case 0x7f:
if (offset == 0xfc7f)
if ((offset & 0x3ff) == 0x07f)
m_acia->control_w(data);
else
else if ((offset & 0x3ff) == 0x17f)
m_acia->data_w(data);
break;
case 0x9f:
Expand Down
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