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I am not an expert... but I "think" I did figure this one out.

Typically, if you don't see the inputs for a game in the main driver, they will be in a separate linked file... in this particular case:

Line 14: #include "includes/konamipt.h"

After reading the file, it looks like many Konami games are going to link back here for reference (e.g. Finalizer).

Your last lines below list the inputs you're worried about:

> PORT_START("P1")
> KONAMI8_B12_COIN_START(1)
>
> PORT_START("P2")
> KONAMI8_B12_COIN_START(2)

Go back to konamipt.h and search for each line, and you'll find:

#define KONAMI8_B12_COIN_START( player ) \
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(player) \
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(player) \
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(player) \
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(player) \
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(player) \
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(player) \
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_COIN##player ) \
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_START##player )

Your inputtags are P1 and P2; your inputmasks are listed above... that "should" work, if I'm reading this right. (I don't have ability to test right now).

------------------------------------------------------------------
> I'm in the process of adding working buttons to all of my files, and some of these
> have me stumped. The game in question at present is aliens. The only reference I can
> find in the driver source is thus:
>
> PORT_START("DSW1")
> KONAMI_COINAGE_LOC(DEF_STR( Free_Play ), "No Credits", SW1)
> /* "No Credits" = both coin slots open, but no effect on coin counters */
>
> PORT_START("DSW2")
> PORT_DIPNAME( 0x03, 0x02, DEF_STR( Lives ) ) PORT_DIPLOCATION("SW2:1,2")
> PORT_DIPSETTING( 0x03, "1" )
> PORT_DIPSETTING( 0x02, "2" )
> PORT_DIPSETTING( 0x01, "3" )
> PORT_DIPSETTING( 0x00, "5" )
> PORT_DIPUNUSED_DIPLOC( 0x0004, 0x0004, "SW2:3" ) /* Listed as "Unused" */
> PORT_DIPUNUSED_DIPLOC( 0x0008, 0x0008, "SW2:4" ) /* Listed as "Unused" */
> PORT_DIPUNUSED_DIPLOC( 0x0010, 0x0010, "SW2:5" ) /* Listed as "Unused" */
> PORT_DIPNAME( 0x60, 0x40, DEF_STR( Difficulty ) ) PORT_DIPLOCATION("SW2:6,7")
> PORT_DIPSETTING( 0x60, DEF_STR( Easy ) )
> PORT_DIPSETTING( 0x40, DEF_STR( Normal ) )
> PORT_DIPSETTING( 0x20, DEF_STR( Hard ) )
> PORT_DIPSETTING( 0x00, DEF_STR( Very_Hard ) )
> PORT_DIPNAME( 0x80, 0x00, DEF_STR( Demo_Sounds ) ) PORT_DIPLOCATION("SW2:8")
> PORT_DIPSETTING( 0x80, DEF_STR( Off ) )
> PORT_DIPSETTING( 0x00, DEF_STR( On ) )
>
> PORT_START("DSW3")
> PORT_DIPNAME( 0x01, 0x01, DEF_STR( Flip_Screen ) ) PORT_DIPLOCATION("SW3:1")
> PORT_DIPSETTING( 0x01, DEF_STR( Off ) )
> PORT_DIPSETTING( 0x00, DEF_STR( On ) )
> PORT_DIPUNUSED_DIPLOC( 0x02, 0x02, "SW3:2" ) /* Listed as "Unused" */
> PORT_SERVICE_DIPLOC( 0x04, IP_ACTIVE_LOW, "SW3:3" )
> PORT_DIPUNUSED_DIPLOC( 0x08, 0x08, "SW3:4" ) /* Listed as "Unused" */
> PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_SERVICE1 )
> PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
> PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
> PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )
>
> PORT_START("P1")
> KONAMI8_B12_COIN_START(1)
>
> PORT_START("P2")
> KONAMI8_B12_COIN_START(2)
>
> From this, I can't determine what to put in the .lay file to get it to read the
> Player 1 start, Player 2 start, and buttons 1 and 2 for each player. The .cfg file
> wasn't much help either. Rather than ask how to find it for this particular game,
> since I'm going to be doing hundreds of these I'll ask instead what methodology you'd
> use to find it? Is there some kind of reverse hook app available?

RELAX and just have fun. Remember, it's all about the games.