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Archived from groups: rec.games.video.arcade.collecting (More info?)
Maybe someone can help me. I have a Space Encounters arcade cabinet
which I am trying to revive. I have verified the motherboard PCB and
daughter board are receiving the appropriate power supply levels.
I have some new 2107 Ram replacement chips which I just received and
am trying to locate which Ram chips are bad. I am trying to do this
by setting the DIP switch settings to "RAM test" and then placing one
new Ram chip on top of each of the 16 existing non-socketed Ram chips
on the motherboard PCB. I was hoping this would tell me which Ram
chip was bad by eventually displaying the nice RAM test display on the
monitor, however, this never occurred.
I actually tried every combination of one new RAM chip piggy-backing
the exist RAM chip as well as even combo of 2 new RAM Chips
piggy-backing two existing RAM chips. No luck.
The following are pictures of what I am seeing:
1) This shows what I see when the RAM test DIP switch IS NOT on when
the cabinet is powered on.
http://unclet.arcadecontrols.com/SpaceEn/myRamTestDipOff1.jpg
2) This is what my monitor fades to every now and again while the RAM
test DIP switch IS NOT on.
http://unclet.arcadecontrols.com/SpaceEn/myRamTestDipOff2.jpg
3) This shows what I see when the RAM test DIP switch IS on when the
cabinet is powered on.
http://unclet.arcadecontrols.com/SpaceEn/myRamTestDipOn.jpg
4) This shows what I see when the RAM test DIP switch IS on and one of
my new RAM chips is on one of the old non-socketed Ram chips on the
PCB.
http://unclet.arcadecontrols.com/SpaceEn/myRamTestDipOnWithNewRam.jpg
Any help with what I should do to resolve the problem as to why I can
not see a nice game image would be nice.....
QUESTIONS:
a) Are my Roms bad (based on the images ... if you can tell)?
b) Can I simply piggy-back all 16 socketed RAM chips with 16 new 2107
replacement RAM chips all at the same time?
c) Am I damaging my PCB or RAM by piggy-backing RAM chips?
Thanks
UncleT
Maybe someone can help me. I have a Space Encounters arcade cabinet
which I am trying to revive. I have verified the motherboard PCB and
daughter board are receiving the appropriate power supply levels.
I have some new 2107 Ram replacement chips which I just received and
am trying to locate which Ram chips are bad. I am trying to do this
by setting the DIP switch settings to "RAM test" and then placing one
new Ram chip on top of each of the 16 existing non-socketed Ram chips
on the motherboard PCB. I was hoping this would tell me which Ram
chip was bad by eventually displaying the nice RAM test display on the
monitor, however, this never occurred.
I actually tried every combination of one new RAM chip piggy-backing
the exist RAM chip as well as even combo of 2 new RAM Chips
piggy-backing two existing RAM chips. No luck.
The following are pictures of what I am seeing:
1) This shows what I see when the RAM test DIP switch IS NOT on when
the cabinet is powered on.
http://unclet.arcadecontrols.com/SpaceEn/myRamTestDipOff1.jpg
2) This is what my monitor fades to every now and again while the RAM
test DIP switch IS NOT on.
http://unclet.arcadecontrols.com/SpaceEn/myRamTestDipOff2.jpg
3) This shows what I see when the RAM test DIP switch IS on when the
cabinet is powered on.
http://unclet.arcadecontrols.com/SpaceEn/myRamTestDipOn.jpg
4) This shows what I see when the RAM test DIP switch IS on and one of
my new RAM chips is on one of the old non-socketed Ram chips on the
PCB.
http://unclet.arcadecontrols.com/SpaceEn/myRamTestDipOnWithNewRam.jpg
Any help with what I should do to resolve the problem as to why I can
not see a nice game image would be nice.....
QUESTIONS:
a) Are my Roms bad (based on the images ... if you can tell)?
b) Can I simply piggy-back all 16 socketed RAM chips with 16 new 2107
replacement RAM chips all at the same time?
c) Am I damaging my PCB or RAM by piggy-backing RAM chips?
Thanks
UncleT