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amstrad: non-readable I/O returns 0 on Plus systems, fixes some system and CRTC detection methods

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mahlemiut 2015-11-27 22:01:55 +13:00
parent 52385b8a11
commit 0e262ba9d7
1 changed files with 3 additions and 0 deletions
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3
src/mame/machine/amstrad.cpp
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@ -1863,6 +1863,9 @@ READ8_MEMBER(amstrad_state::amstrad_cpc_io_r)
}
}
if ( m_system_type == SYSTEM_PLUS || m_system_type == SYSTEM_GX4000 ) // Plus systems return 0 when attempting to read the gate array (and any other unreadable space too?)
data = 0;
/* if b14 = 0 : CRTC Read selected */
if ((offset & (1<<14)) == 0)
{