John Bennett
Senior Member
[ukvac] [Slightly-OT TECH] SRAM question
Hi guys,
Got a few questions about a particular SRAM chip used in my
SNES copier (Pro-Fighter X). Am posting it here because I'm
sure plenty of people on the list know their SRAM.
It's a 256k socketed Hyundai chip with 2 rows of 14 legs,
marked as
HY62256ALP-10
9224A KOREA
Scenario.
This chip used to save fine and hold data when powered off,
but then the Ni-Cad cell I had powering it spunked all over
itself and the board and was promptly removed and the board
cleaned. No other components seem to have been affected and
all the tracks are still fine around where the previous
battery was. I have since replaced the battery with a 3.6v
Ni-MH cell and the chip now appears not to want to save
anything when the machine's powered on, and obviously
doesn't retain data when powered off because it won't take
any data in. I have removed, cleaned the legs and socket and
re-seated it but still nothing.
Questions.
1) Am I definitely running the correct voltage to power this
chip?
2) Does this chip 'die' if it's not been powered for about 2
months? e.g. it's had no power to it for that time, does it
need some sort of jump-start to wake it back up again?
3) Are there any other substitute chips I could use that
don't need to be powered by battery if it's the charging
circuit that's dead?
4) Is there any way I can check to see if the chip is still
alive?
Any other useful information would be greatly appreciated as
the unit's not easily replaceable.
Thanks in advance,
Justin (Vertigo)
DATA Imported from archives: originally posted by Vertigo (vertigo@ukonline.co.uk)
Hi guys,
Got a few questions about a particular SRAM chip used in my
SNES copier (Pro-Fighter X). Am posting it here because I'm
sure plenty of people on the list know their SRAM.
It's a 256k socketed Hyundai chip with 2 rows of 14 legs,
marked as
HY62256ALP-10
9224A KOREA
Scenario.
This chip used to save fine and hold data when powered off,
but then the Ni-Cad cell I had powering it spunked all over
itself and the board and was promptly removed and the board
cleaned. No other components seem to have been affected and
all the tracks are still fine around where the previous
battery was. I have since replaced the battery with a 3.6v
Ni-MH cell and the chip now appears not to want to save
anything when the machine's powered on, and obviously
doesn't retain data when powered off because it won't take
any data in. I have removed, cleaned the legs and socket and
re-seated it but still nothing.
Questions.
1) Am I definitely running the correct voltage to power this
chip?
2) Does this chip 'die' if it's not been powered for about 2
months? e.g. it's had no power to it for that time, does it
need some sort of jump-start to wake it back up again?
3) Are there any other substitute chips I could use that
don't need to be powered by battery if it's the charging
circuit that's dead?
4) Is there any way I can check to see if the chip is still
alive?
Any other useful information would be greatly appreciated as
the unit's not easily replaceable.
Thanks in advance,
Justin (Vertigo)
DATA Imported from archives: originally posted by Vertigo (vertigo@ukonline.co.uk)