pproved: Xander
>From chris@westnet.com Fri May 25 18:02:31 2012
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Date: Fri, 25 May 2012 15:02:20 -0700 (PDT)
From: Chris Loggans <cloggans@yahoo.com>
Subject: Re: RASTER: Space Invaders Tilt error
To: rasterlist@vectorlist.org
In-Reply-To: <CAFWDB5_T6OnvCpiM6jgc8mgheFnb8f3F6R_vYiF2YAjCY6iYYA@mail.gmail.com>
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Kevin,
=A0
=A0=A0=A0=A0 I went through the same thing and if your schematics are like =
mine, they don't show where the tilt switch is connected.=A0 I ended up tra=
cing it out at one point=A0and here is what I found:
=A0
The tilt switch input comes in on pin 4 of the right hand connector of the =
sound board.=A0 It goes through a resistor and capacitor like all other swi=
tch inputs and terminates at pin 5 of B2.=A0 It then goes out on pin 6 of B=
2 and connects to pin 4 of B3.=A0 The schematics incorrectly show that pin =
4 on B3 is connected to the +5 volt line that is pulling up all port 0 (P0x=
) inputs, but it is not.=A0 B3 is a multiplexer that puts the status of the=
tilt switch on the MX buss when the port 2 inputs are probed.=A0 If there =
was a problem with the MX buss, your game would probably be dead so you sho=
uldn't need to look any further than B3.=A0 Hopefully that gives you a good=
place to start looking.
=A0
Good luck,
-Chris
--- On Mon, 5/21/12, Kevin Moore <talon.k@gmail.com> wrote:
From: Kevin Moore <talon.k@gmail.com>
Subject: RASTER: Space Invaders Tilt error
To: rasterlist@vectorlist.org
Date: Monday, May 21, 2012, 12:35 PM
I know I've seen this solution somewhere but for the life of me I cannot fi=
nd it. Got a SI that's showing title error. The schematics don't show a til=
t circuit so I'm guessing it was not implemented. Power Supply good, cab go=
od as I've swapped board sets and no problem there.=20
I'm betting there is either a shorted trace or chip on the motherboard, jus=
t not sure where to start looking.=20
Thanks=20
Kevin
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<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D"=
top" style=3D"font: inherit;"><DIV>Kevin,</DIV>
<DIV> </DIV>
<DIV> I went through the same thing and if your sch=
ematics are like mine, they don't show where the tilt switch is connected.&=
nbsp; I ended up tracing it out at one point and here is what I found:=
</DIV>
<DIV> </DIV>
<DIV>The tilt switch input comes in on pin 4 of the right hand connector of=
the sound board. It goes through a resistor and capacitor like all o=
ther switch inputs and terminates at pin 5 of B2. It then goes out on=
pin 6 of B2 and connects to pin 4 of B3. The schematics incorrectly =
show that pin 4 on B3 is connected to the +5 volt line that is pulling up a=
ll port 0 (P0x) inputs, but it is not. B3 is a multiplexer that puts =
the status of the tilt switch on the MX buss when the port 2 inputs are pro=
bed. If there was a problem with the MX buss, your game would probabl=
y be dead so you shouldn't need to look any further than B3. Hopefull=
y that gives you a good place to start looking.</DIV>
<DIV> </DIV>
<DIV>Good luck,</DIV>
<DIV>-Chris<BR><BR>--- On <B>Mon, 5/21/12, Kevin Moore <I><talon.k@gmail=
.com></I></B> wrote:<BR></DIV>
<BLOCKQUOTE style=3D"BORDER-LEFT: rgb(16,16,255) 2px solid; PADDING-LEFT: 5=
px; MARGIN-LEFT: 5px"><BR>From: Kevin Moore <talon.k@gmail.com><BR>Su=
bject: RASTER: Space Invaders Tilt error<BR>To: rasterlist@vectorlist.org<B=
R>Date: Monday, May 21, 2012, 12:35 PM<BR><BR>
<DIV id=3Dyiv1160646103>
<DIV>I know I've seen this solution somewhere but for the life of me I cann=
ot find it. Got a SI that's showing title error. The schematics don't show =
a tilt circuit so I'm guessing it was not implemented. Power Supply good, c=
ab good as I've swapped board sets and no problem there. </DIV>
<DIV>I'm betting there is either a shorted trace or chip on the motherboard=
, just not sure where to start looking. </DIV>
<DIV>Thanks <BR>Kevin</DIV></DIV></BLOCKQUOTE></td></tr></table>
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Received on Sat May 26 07:52:12 2012
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