Robotron ram upgrade

Jessejames

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Anyone recommend the ram upgrade on Robotron with adapter?
Mine tends to reboot and go to the carpet screen.
Getting a ram error on occasion.
 
Anyone recommend the ram upgrade on Robotron with adapter?
Mine tends to reboot and go to the carpet screen.
Getting a ram error on occasion.
I've done it with an adapter and by cutting the trace. Both work fine and my Williams boards and PSs love the newer RAM.

Scott C.
 
Robotron ram upgrade?? What is it, what I miss??

4164 ram. it has its advantages over the original 4116 ram, notably being that it runs off +5 only (instead of the tri-voltage +5, +12, -5 arrangement). it will run much cooler as a result.

there's a lot of other more important areas to focus on with these games though, mainly regarding power. you'll want to replace the MPU/rom board caps (100 uf/25V), the power headers, and for added measure the power plugs with new Molex parts. your boards will lose a lot of voltage if these 3 elements are left alone, which will make your boards typically not work right.

4164 ram will be the last thing you want to do. the 4116 ram isn't necessarily bad, the only drawback is if you're running an old linear power supply that hasn't been rebuilt properly you run the risk of losing a voltage and thus the entire game will be a wash. many people are proponents of just dropping a switcher and 4164 ram, these alone will not fix your game. I already said why.
 
4164 ram. it has its advantages over the original 4116 ram, notably being that it runs off +5 only (instead of the tri-voltage +5, +12, -5 arrangement). it will run much cooler as a result.

there's a lot of other more important areas to focus on with these games though, mainly regarding power. you'll want to replace the MPU/rom board caps (100 uf/25V), the power headers, and for added measure the power plugs with new Molex parts. your boards will lose a lot of voltage if these 3 elements are left alone, which will make your boards typically not work right.

4164 ram will be the last thing you want to do. the 4116 ram isn't necessarily bad, the only drawback is if you're running an old linear power supply that hasn't been rebuilt properly you run the risk of losing a voltage and thus the entire game will be a wash. many people are proponents of just dropping a switcher and 4164 ram, these alone will not fix your game. I already said why.

WOW!...thanks for the info...it will be put to good use.

Chris
 
4164 ram. it has its advantages over the original 4116 ram, notably being that it runs off +5 only (instead of the tri-voltage +5, +12, -5 arrangement). it will run much cooler as a result.

there's a lot of other more important areas to focus on with these games though, mainly regarding power. you'll want to replace the MPU/rom board caps (100 uf/25V), the power headers, and for added measure the power plugs with new Molex parts. your boards will lose a lot of voltage if these 3 elements are left alone, which will make your boards typically not work right.

4164 ram will be the last thing you want to do. the 4116 ram isn't necessarily bad, the only drawback is if you're running an old linear power supply that hasn't been rebuilt properly you run the risk of losing a voltage and thus the entire game will be a wash. many people are proponents of just dropping a switcher and 4164 ram, these alone will not fix your game. I already said why.
Agreed, but for games with solid power and boards, the 4164 (or bigger) is a good solution. I run an original linear PS and just pulled the- 5v fuse.

Scott C.
 
I contacted Bob Roberts. Going to order the ram upgrade and new ribbon cables.
I'll cap the board too. Thanks guys!!
 
if you're psycho and are running a linear that HASN'T been rebuilt, then stick to 4116 ram. if the +5 sags, there's a chance the 4164 won't work I've found.

I encourage the "OCD method" that I outline frequently with these games. you'll never have problems again unless a ribbon cable goes bad.
 
if you're psycho and are running a linear that HASN'T been rebuilt, then stick to 4116 ram. if the +5 sags, there's a chance the 4164 won't work I've found.

I encourage the "OCD method" that I outline frequently with these games. you'll never have problems again unless a ribbon cable goes bad.



Thanks for the info. I'll rebuild the power supply as well.
I checked voltage at the board. It was 5.25. Is that to high?
 
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