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rollingc: add comment for IN0 bit 0

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hap 2024-04-17 14:33:32 +02:00
parent f96bb1bf71
commit 32f6f833ca
1 changed files with 4 additions and 1 deletions
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5
src/mame/midw8080/8080bw.cpp
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@ -356,7 +356,7 @@ static INPUT_PORTS_START( alieninv )
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_START("IN2")
PORT_DIPNAME( 0x01, 0x01, DEF_STR( Lives ) ) PORT_DIPLOCATION("SW1:1")
PORT_DIPNAME( 0x01, 0x01, DEF_STR( Lives ) ) PORT_DIPLOCATION("SW1:1")
PORT_DIPSETTING( 0x00, "2" )
PORT_DIPSETTING( 0x01, "3" )
PORT_DIPNAME( 0x02, 0x02, "Pence Coinage" ) PORT_DIPLOCATION("SW1:2")
@ -1555,6 +1555,9 @@ static INPUT_PORTS_START( rollingc )
PORT_INCLUDE( sicv_base )
PORT_MODIFY("IN0")
// bit 0: Looks like simple protection for moonbase, see routine at $0EB1, gets called at $0DD2.
// It checks for score overflow, and the game ends with message "YOU ARE TOO STRONG" when score
// overflows from 99990 to 0. If bit 0 value = 1, the game ends prematurely when score hits 1000.
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x06, IP_ACTIVE_LOW, IPT_CUSTOM ) PORT_CUSTOM_MEMBER(rollingc_state, game_select_r)