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namco/20pacgal.cpp: Better values for unknown SERVICE and EEPROMIN port bits. (#10600)

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*  Fixes bug in 25pacmano where after 64 plays, copy protection prevents game from starting (tracked at address 0x3E-0x3F in EEPROM).
* Changes to 20pacgal ports verified on hardware, though makes no noticeable difference to gameplay.
* Ports of 25pacman left as-is, no hardware to verify with.
This commit is contained in:
pdaderko 2022-11-26 02:56:23 -05:00 committed by GitHub
parent 78b6b23115
commit 434579ec7a
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 19 additions and 13 deletions
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32
src/mame/namco/20pacgal.cpp
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@ -309,16 +309,23 @@ static INPUT_PORTS_START( 20pacgal )
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_START4 ) PORT_NAME( "Right 2 Players Start" )
PORT_START("SERVICE")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_SERVICE_NO_TOGGLE( 0x80, IP_ACTIVE_LOW )
PORT_START( "EEPROMIN" )
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_CUSTOM ) PORT_READ_LINE_DEVICE_MEMBER("eeprom", eeprom_serial_93cxx_device, do_read) /* bit 7 is EEPROM data */
PORT_START( "EEPROMOUT" )
@ -333,6 +340,7 @@ static INPUT_PORTS_START( 25pacman )
PORT_INCLUDE(20pacgal)
PORT_MODIFY("SERVICE")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNKNOWN )
@ -345,12 +353,10 @@ static INPUT_PORTS_START( 25pacmano )
PORT_INCLUDE(20pacgal)
PORT_MODIFY("SERVICE")
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_MODIFY("EEPROMIN")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
INPUT_PORTS_END
/*************************************