Re: Cinematronics Tailgunner Start Light

Matt, What is the state (high or low) of J3 pin 9, when there is no coin
inserted?

On Tue, Apr 13, 2010 at 3:32 PM, Matthew Rossiter <matt@rossiters.com>wrote:

> If I take out the 2N3904 NPN transistor and put in a 2N3906 PNP transistor
> - the start light works as I would expect (off when there's no 'Press Start'
> message). The manual specifies a typical *red* (mv50) led by the way. Just
> to give it that extra cheezy space control panel effect.
>
> I guess the guys over at vectorbeam wanted that light to be on solid the
> whole time. I wonder if Cinematronics was the deciding factor for not
> including the light when they acquired Tailgunner just to save a coupla
> bucks?
>
> Oh well, looks like I'll make a compromise and put in the pnp transistor
> instead.
>
> Matt
>
>
>
>
> On 4/13/2010 1:47 AM, Andrew Welburn wrote:
>
>> Try wiring your LED the other way round, that'll give you the inverse lit
>> sequence.
>>
>> Cool hack tho, i love adding the bits that the designers intended, but the
>> manufacturing side didn't because of cost-cuttinng/time saving.
>>
>> They probably designed it this way because all atari TTL games of the 70's
>> did this to indicate credits (as there was no on-screen credit
>> annunciation). If you don't want to confuse your players, make your machine
>> act like all the others around you...
>>
>> I know TG has on-screen credit display, but maybe they coded that in after
>> the pcb design was done? or maybe they just wanted to do both in order to
>> blend in with the times... after all, asteroids also does both...
>>
>> Andrew Welburn
>> www.andys-arcade.com
>>
>> ----- Original Message ----- From: "Matthew Rossiter" <matt@rossiters.com
>> >
>> To: <vectorlist@vectorlist.org>
>> Sent: Tuesday, April 13, 2010 3:41 AM
>> Subject: VECTOR: Cinematronics Tailgunner Start Light
>>
>>
>> Question#2: I don't think the inverter circuit is working properly
>>> because the LED stays on solid and then blinks when a coin is inserted. I
>>> would expect the led to be *off* when no coin is inserted - then blink when
>>> coin is inserted. Is that right?
>>>
>>> Thanks,
>>>
>>> Matt
>>>
>>
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>>
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Received on Wed Apr 14 08:33:36 2010