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pc9801: back off max ram to not overrun the ext gvram and obey protection bits(nw)

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This commit is contained in:
cracyc 2016-02-18 20:22:06 -06:00
parent 355acb1306
commit 2c242bc16e
1 changed files with 3 additions and 1 deletions
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4
src/mame/drivers/pc9801.cpp
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@ -2293,6 +2293,8 @@ WRITE8_MEMBER(pc9801_state::pc9821_video_ff_w)
{
if(offset == 1)
{
if(((data & 0xfe) == 4) && !m_ex_video_ff[3]) // TODO: many other settings are protected
return;
m_ex_video_ff[(data & 0xfe) >> 1] = data & 1;
//if((data & 0xfe) == 0x20)
@ -3466,7 +3468,7 @@ static MACHINE_CONFIG_START( pc9801rs, pc9801_state )
MCFG_RAM_ADD(RAM_TAG)
MCFG_RAM_DEFAULT_SIZE("1664K")
MCFG_RAM_EXTRA_OPTIONS("640K,3712K,7808K,16M")
MCFG_RAM_EXTRA_OPTIONS("640K,3712K,7808K,14M")
MCFG_DEVICE_MODIFY("upd7220_btm")
MCFG_DEVICE_ADDRESS_MAP(AS_0, upd7220_grcg_2_map)