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pcx: some page protection bits

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This commit is contained in:
cracyc 2020-07-27 19:01:39 -05:00
parent 4aae75d753
commit 6962e5c191
1 changed files with 4 additions and 4 deletions
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8
src/mame/drivers/pcd.cpp
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@ -239,7 +239,7 @@ uint16_t pcd_state::mmu_r(offs_t offset)
//logerror("%s: mmu read %04x %04x\n", machine().describe_context(), (offset << 1) + 0x8000, data);
if(!offset)
return m_mmu.ctl;
else if((offset >= 0x200) && (offset < 0x300) && !(offset & 3))
else if((offset >= 0x200) && (offset < 0x400) && !(offset & 3))
return (data << 4) | (data >> 12) | (m_mmu.sc && (offset == 0x200) ? 0xc0 : 0);
else if(offset == 0x400)
{
@ -254,7 +254,7 @@ void pcd_state::mmu_w(offs_t offset, uint16_t data)
//logerror("%s: mmu write %04x %04x\n", machine().describe_context(), (offset << 1) + 0x8000, data);
if(!offset)
m_mmu.ctl = data;
else if((offset >= 0x200) && (offset < 0x300) && !(offset & 3))
else if((offset >= 0x200) && (offset < 0x400) && !(offset & 3))
m_mmu.regs[((m_mmu.ctl & 0x1f) << 5) | ((offset >> 2) & 0x1f)] = (data >> 4) | (data << 12);
else if(offset == 0x400)
{
@ -376,7 +376,7 @@ void pcd_state::mem_w(address_space &space, offs_t offset, uint16_t data, uint16
reg = m_mmu.regs[((offset >> 10) & 0xff) | ((m_mmu.ctl & 0x18) << 5)];
else
reg = m_mmu.regs[((offset >> 10) & 0x7f) | ((m_mmu.ctl & 0x1c) << 5)];
if(!reg && !machine().side_effects_disabled())
if(!(reg & 1) && !machine().side_effects_disabled())
{
offset <<= 1;
logerror("%s: Null mmu entry %06x\n", machine().describe_context(), offset);
@ -398,7 +398,7 @@ uint16_t pcd_state::mem_r(address_space &space, offs_t offset)
reg = m_mmu.regs[((offset >> 10) & 0xff) | ((m_mmu.ctl & 0x18) << 5)];
else
reg = m_mmu.regs[((offset >> 10) & 0x7f) | ((m_mmu.ctl & 0x1c) << 5)];
if(!reg && !machine().side_effects_disabled())
if(!(reg & 2) && !machine().side_effects_disabled())
{
offset <<= 1;
logerror("%s: Null mmu entry %06x\n", machine().describe_context(), offset);