> Anyway, I don't know if any of this helps to demystify the underlying principles any,
> or if I've just managed to confuse you more, but hey.
No... actually, this makes it all make more sense to me... I didn't actually understand the difference between Active Low vs High, and the way you laid it all out, it's actually logical now.
(I didn't understand "why" the "subtraction" thing worked; I just knew it did).
New question then... I tried to find an example of Active High, and I think I found my first anomaly where I'm stuck:
static INPUT_PORTS_START( espial )
PORT_START("IN1")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_START1 )
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_START2 )
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_COCKTAIL
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_COCKTAIL
PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP ) PORT_8WAY PORT_COCKTAIL
PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN ) PORT_8WAY
PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_COCKTAIL
PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_COCKTAIL
PORT_START("IN2")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_COIN1 )
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_8WAY
PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP ) PORT_8WAY
PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_COCKTAIL
PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_BUTTON1 )
PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_8WAY
Since JOYSTICK_DOWN is in IN1, separate from the other three in IN2, I can't fully animate the upright 8-way stick? (Though I could still do the cocktail version?).
RELAX and just have fun. Remember, it's all about the games.
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