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la120: Fix remaining problems with ER1400 accesses (nw)

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This commit is contained in:
AJR 2018-01-01 03:13:17 -05:00
parent d0ac21c996
commit 7c2220e8ca
1 changed files with 9 additions and 1 deletions
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10
src/mame/drivers/decwritr.cpp
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@ -137,11 +137,19 @@ WRITE8_MEMBER( decwriter_state::la120_LED_w )
*/
READ8_MEMBER( decwriter_state::la120_NVR_r )
{
// one wait state inserted
if (!machine().side_effect_disabled())
m_maincpu->adjust_icount(-1);
return (m_nvm->data_r() << 7) | 0x7e;
}
WRITE8_MEMBER( decwriter_state::la120_NVR_w )
{
// one wait state inserted
if (!machine().side_effect_disabled())
m_maincpu->adjust_icount(-1);
// ER1400 has negative logic, but 7406 inverters are used
m_nvm->c3_w(BIT(offset, 10));
m_nvm->c2_w(BIT(offset, 9));
@ -150,7 +158,7 @@ WRITE8_MEMBER( decwriter_state::la120_NVR_w )
// C2 is used to disable pullup on data line
m_nvm->data_w(!BIT(offset, 9) ? 0 : !BIT(data, 7));
m_nvm->clock_w(BIT(offset, 0));
m_nvm->clock_w(!BIT(offset, 0));
}
/* todo: fully reverse engineer DC305 ASIC */