Robotron 1-3-1 (I know..)

Spath smack downs are my favorite.
credit where it's due, he does know what he's talking about on a level I both don't understand and don't really care about because it's not really a component of what I do. he's not a game technician, I would venture he's a very high level engineer and that's great for him. I am a game technician, I have to deal with all of this every day. I don't specialize in one area; my job consists of me being able to take on any area. it just happens the Williams games were something that interested me years ago and my old job we got several non-working games that I had to make work. it was also something of a personal vendetta for me because I saw a lot of Robotrons, Jousts, and Sinistars not working out in the world. coupled with the fact that Ken Graham left, I thought it was something I could do for the community and arcades where I used to live. there's people here that have vast expertise with maybe 1 or 2 platforms, good for them. I can't be that person. I have to do video games, pinball, monitors, formerly redemption games, cranes, whatever. if it's something I don't do I flat out refuse to do it, cause there's someone else more qualified and it would inevitably probably wind up costing less.

Brad Raedel is a high level engineer that I know for fact, he's a brilliant mind for the Williams thing. I don't own it, if he wants to he can do that. I interpret there to be some kind of rift between him and me, so I'm going to say it so everyone in the back can hear: I don't fix Williams games for people anymore. there's no conflict between us. I have enough responsibility where I work now doing things that are literally damaging to my spine, I don't need the added stress of fixing games for people through the mail just for them to get everything back and shit on me in the aftermath.

I don't have beef with anyone here. I fix things, that's my purpose in life. I respect anyone that's also committed to that goal. including you @Charles Kline :love:

I invented @SCUBA King and @tron guy, and @Arcadenut I gather doesn't like me either and that's fine, he's great too.

@gamefixer is the GOAT

for the rest of you, enjoy the moment while it lasts, cause my run here is nearing its end.

that's it for my rant. let's keep pre-war technology alive.
 
credit where it's due, he does know what he's talking about on a level I both don't understand and don't really care about because it's not really a component of what I do. he's not a game technician, I would venture he's a very high level engineer and that's great for him. I am a game technician, I have to deal with all of this every day. I don't specialize in one area; my job consists of me being able to take on any area. it just happens the Williams games were something that interested me years ago and my old job we got several non-working games that I had to make work. it was also something of a personal vendetta for me because I saw a lot of Robotrons, Jousts, and Sinistars not working out in the world. coupled with the fact that Ken Graham left, I thought it was something I could do for the community and arcades where I used to live. there's people here that have vast expertise with maybe 1 or 2 platforms, good for them. I can't be that person. I have to do video games, pinball, monitors, formerly redemption games, cranes, whatever. if it's something I don't do I flat out refuse to do it, cause there's someone else more qualified and it would inevitably probably wind up costing less.

Brad Raedel is a high level engineer that I know for fact, he's a brilliant mind for the Williams thing. I don't own it, if he wants to he can do that. I interpret there to be some kind of rift between him and me, so I'm going to say it so everyone in the back can hear: I don't fix Williams games for people anymore. there's no conflict between us. I have enough responsibility where I work now doing things that are literally damaging to my spine, I don't need the added stress of fixing games for people through the mail just for them to get everything back and shit on me in the aftermath.

I don't have beef with anyone here. I fix things, that's my purpose in life. I respect anyone that's also committed to that goal. including you @Charles Kline :love:

I invented @SCUBA King and @tron guy, and @Arcadenut I gather doesn't like me either and that's fine, he's great too.

@gamefixer is the GOAT

for the rest of you, enjoy the moment while it lasts, cause my run here is nearing its end.

that's it for my rant. let's keep pre-war technology alive.
You do you. You are fine.

I for one appreciate your insights, as I suspect do others. You are helpful without being trollish.
 

If the select inputs are done in a specific sequence (ie. a counter), it can perform that way, but that's now how it's used in Williams hardware, kiddo.

No reasonable designer would ever use it this way due to the timing hazards between the select inputs and (unlatched) data inputs.

Those 8 166's -- they're parallel to serial converters.
 
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credit where it's due, he does know what he's talking about on a level I both don't understand and don't really care about because it's not really a component of what I do. he's not a game technician, I would venture he's a very high level engineer and that's great for him. I am a game technician, I have to deal with all of this every day. I don't specialize in one area; my job consists of me being able to take on any area. it just happens the Williams games were something that interested me years ago and my old job we got several non-working games that I had to make work. it was also something of a personal vendetta for me because I saw a lot of Robotrons, Jousts, and Sinistars not working out in the world. coupled with the fact that Ken Graham left, I thought it was something I could do for the community and arcades where I used to live. there's people here that have vast expertise with maybe 1 or 2 platforms, good for them. I can't be that person. I have to do video games, pinball, monitors, formerly redemption games, cranes, whatever. if it's something I don't do I flat out refuse to do it, cause there's someone else more qualified and it would inevitably probably wind up costing less.

Brad Raedel is a high level engineer that I know for fact, he's a brilliant mind for the Williams thing. I don't own it, if he wants to he can do that. I interpret there to be some kind of rift between him and me, so I'm going to say it so everyone in the back can hear: I don't fix Williams games for people anymore. there's no conflict between us. I have enough responsibility where I work now doing things that are literally damaging to my spine, I don't need the added stress of fixing games for people through the mail just for them to get everything back and shit on me in the aftermath.

I don't have beef with anyone here. I fix things, that's my purpose in life. I respect anyone that's also committed to that goal. including you @Charles Kline :love:

I invented @SCUBA King and @tron guy, and @Arcadenut I gather doesn't like me either and that's fine, he's great too.

@gamefixer is the GOAT

for the rest of you, enjoy the moment while it lasts, cause my run here is nearing its end.

that's it for my rant. let's keep pre-war technology alive.

You are the Paul Heyman of arcade repair.
 
Thanks for the offer BR. Luckily I have a working sinistar to swap boards with.

Braedel

I installed the sinistar rom board in robotron with the robotron CPU board. So I eliminated power, and the robotron CPU board. I'm working on the robotron ROM board. I verified the 6821 is good as is the 74244 and the special chips which I swapped in from the sinistar. I'm going to read the roms and compare the images to known good ones.

Getting closer...
 
IIRC, the entirety of the self-test is in the E7 ROM, so you can test that one and pull the others... once you get your RAM test happy, let the ROM test test the rest of the ROMs.
So how does that work? If you've pulled all the ROMS except for E7, how will the ROM test, test all the rest of the ROMS?
 
So how does that work? If you've pulled all the ROMS except for E7, how will the ROM test, test all the rest of the ROMS?

Hint:
You remove the rest in case one is bad and is loading down the bus.
You put them back in to test them

It doesn't matter if they test good in your ROM reader if they test bad in the game.
 
Two bad chips on the ROM board - 7411 and 7425. After testing in circuit I pulled them and both failed on the tester. I don't have either so I'm ordering a few. Update when they're in.

...which means it's probably erroneously enabling the '154 and in turn enabling one of the ROMs during RAM accesses, stomping on the RAM test -- which is why I said to remove the other ROMs to test the RAM.

1757540099757.png
 
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