I am working on a Tron full size upright, and the power supply was unusable. I pulled out the entire power supply and installed a switcher. The game now works perfect, but to get it to boot up, I have to put the purple reset wire on +5 before I turn it on, then turn it on, take it off for a second, then put it back on.
In other words, to boot the reset line must go HIGH, LOW, HIGH. Is there a timer circuit that I can build that can do this for me? This game is going to be used comercially, and we don't want to have to explain to the people at the location how to boot the game every time they turn it on.
I hope that lots of people read this hack, as it works for me every time. The problem with the original PS in the MCR games is that the memory battery leaks and eats up the reset circuit. Usually it takes alot of time to repair so I did an expieriment. The reset is just a +5vdc signal that is timed to allow the logic power to stabilize before cpu startup. By removing Q201 on the original PS that had failed reset output, you allow a 5vdc charge through R215 1.2K to the reset output. Simply stated, abandon the entire pump charger and one shot circuits and just have 5vdc going through a 1.2k resistor. I have not tried this with a switcher, but it works every time on the original. Try installing a 1.2 or higher 1/2 watt resistor between the 5vdc output of the switcher to the purple rest wire. Hope this helps and let me know the results.
: I am working on a Tron full size upright, and the power supply was unusable. I : pulled out the entire power supply and installed a switcher. The game now : works perfect, but to get it to boot up, I have to put the purple reset wire on : +5 before I turn it on, then turn it on, take it off for a second, then put it : back on. : : In other words, to boot the reset line must go HIGH, LOW, HIGH. Is there a : timer circuit that I can build that can do this for me? This game is going to : be used comercially, and we don't want to have to explain to the people at the : location how to boot the game every time they turn it on.
Look at the uP reset circuit on just about an atari game and copy it :)
Basicaly an R-C tuned to meet the appropriate reset delay implemented with the LM3900's on the original PS board...
Just a newbie question. Why can't you put the line to +5v? I have a Taito Jungle King that I did it to and it works fine. I also have a Tron that was converted to a switcher and this was done there too(any comments scottith?).
I could be wrong but I think this is what is being talked about here.
> Have a look at the Qix to JAMMA doc on spies. The taito boards had a > strange reset line too and they have a small diode and cap circuit to get > around that.
> certainly wouldn't hurt anything
> Cheers > MacMan
> In article <19991030060017.04196.00000...@ng-fs1.aol.com>, ajs...@aol.com > (AJSTAY) wrote:
> > I am working on a Tron full size upright, and the power supply was > unusable. I > > pulled out the entire power supply and installed a switcher. The game now > > works perfect, but to get it to boot up, I have to put the purple reset > wire on > > +5 before I turn it on, then turn it on, take it off for a second, then put it > > back on.
> > In other words, to boot the reset line must go HIGH, LOW, HIGH. Is there a > > timer circuit that I can build that can do this for me? This game is going to > > be used comercially, and we don't want to have to explain to the people at the > > location how to boot the game every time they turn it on.
> > Any ideas? Anyone else have to do this before?
Have a look at the Qix to JAMMA doc on spies. The taito boards had a strange reset line too and they have a small diode and cap circuit to get around that.
certainly wouldn't hurt anything
Cheers MacMan
In article <19991030060017.04196.00000...@ng-fs1.aol.com>, ajs...@aol.com
(AJSTAY) wrote: > I am working on a Tron full size upright, and the power supply was unusable. I > pulled out the entire power supply and installed a switcher. The game now > works perfect, but to get it to boot up, I have to put the purple reset wire on > +5 before I turn it on, then turn it on, take it off for a second, then put it > back on.
> In other words, to boot the reset line must go HIGH, LOW, HIGH. Is there a > timer circuit that I can build that can do this for me? This game is going to > be used comercially, and we don't want to have to explain to the people at the > location how to boot the game every time they turn it on.
AJSTAY wrote: > I am working on a Tron full size upright, and the power supply was unusable. I > pulled out the entire power supply and installed a switcher. The game now > works perfect, but to get it to boot up, I have to put the purple reset wire on > +5 before I turn it on, then turn it on, take it off for a second, then put it > back on.
> In other words, to boot the reset line must go HIGH, LOW, HIGH. Is there a > timer circuit that I can build that can do this for me? This game is going to > be used comercially, and we don't want to have to explain to the people at the > location how to boot the game every time they turn it on.
The main CPU stack will power up with the /RESET line left floating.
The main game will work with the /RESET line floating, and so will the CSD board. However, the line should be left disconnected at the PS, not from each other.
: Any info here should be usable on a Spy Hunter, too, right? My PS is all sorts of : f*cked up, and I'd love to throw a switcher in there instead.
: Thanks! : Rob
: AJSTAY wrote:
: > I am working on a Tron full size upright, and the power supply was unusable. I : > pulled out the entire power supply and installed a switcher. The game now : > works perfect, but to get it to boot up, I have to put the purple reset wire on : > +5 before I turn it on, then turn it on, take it off for a second, then put it : > back on. : > : > In other words, to boot the reset line must go HIGH, LOW, HIGH. Is there a : > timer circuit that I can build that can do this for me? This game is going to : > be used comercially, and we don't want to have to explain to the people at the : > location how to boot the game every time they turn it on. : > : > Any ideas? Anyone else have to do this before? : > : > Thanks, : > AJS...@AOL.COM
Floating is not good for RESET. IF you are using a computer switching supply try the "POWER GOOD" line to run the RESET. Otherwise a simple capacitor and pull-up resistor would be a good idea.
John :-#)#
On 2 Nov 1999 17:37:02 GMT, d3c...@acs.ryerson.ca (David Choi -
ELCO/P96) wrote: >The main CPU stack will power up with the /RESET line left floating.
>The main game will work with the /RESET line floating, and so will >the CSD board. However, the line should be left disconnected at >the PS, not from each other.
>Others with more experience can comment on this.
>Rob Carroll (rcarr...@thecia.net) wrote: >: Any info here should be usable on a Spy Hunter, too, right? My PS is all sorts of >: f*cked up, and I'd love to throw a switcher in there instead.
>: Thanks! >: Rob
>: AJSTAY wrote:
>: > I am working on a Tron full size upright, and the power supply was unusable. I >: > pulled out the entire power supply and installed a switcher. The game now >: > works perfect, but to get it to boot up, I have to put the purple reset wire on >: > +5 before I turn it on, then turn it on, take it off for a second, then put it >: > back on. >: > >: > In other words, to boot the reset line must go HIGH, LOW, HIGH. Is there a >: > timer circuit that I can build that can do this for me? This game is going to >: > be used comercially, and we don't want to have to explain to the people at the >: > location how to boot the game every time they turn it on. >: > >: > Any ideas? Anyone else have to do this before? >: > >: > Thanks, >: > AJS...@AOL.COM
(Please post followups or tech enquires to the newsgroup) John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) mailto:j...@flippers.com, web page http://www.flippers.com "Old pinballers never die, they just flip out."
> Floating is not good for RESET. IF you are using a computer switching > supply try the "POWER GOOD" line to run the RESET. Otherwise a simple > capacitor and pull-up resistor would be a good idea.
So can somebody please detail exactly how to do a switcher in a MCR game.I'm a little confused on how to do it.
> John Robertson <j...@flippers.com> wrote in message > news:vyghONcnRBnov8k5o6zXVlHonaAc@4ax.com... > > Floating is not good for RESET. IF you are using a computer switching > > supply try the "POWER GOOD" line to run the RESET. Otherwise a simple > > capacitor and pull-up resistor would be a good idea.
> So can somebody please detail exactly how to do a switcher in a MCR game.I'm > a little confused on how to do it.
> Dave
I've used a switcher and an original linear with the reset circuit fried out. In both cases I just bent out the reset pin on the game board, allowing it to float. It boots up fine 99% of the time.
John knows what he's talking about but I'm just telling you what worked for me.
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