Hi.
I have a Zero Gunner 2 cart with IC7-IC8 BAD.
Seems that the problem is related to the mpr-23687 IC4.
Since this is a masked rom, could someone tell me what i can use as replacement chip?
(http://www.onedigitallife.com/images/barack-obama-yes-we-can.jpg)
Citation de: TylerDurden67 le Lundi 05 Octobre 2015, 20:55:31 PM
(http://www.onedigitallife.com/images/barack-obama-yes-we-can.jpg)
Oh well....
:)
So what can i use???
Its tsop48 128Mb,right ?
Equivalent arent plug and play,you need to modify à little bit
Citation de: TylerDurden67 le Lundi 05 Octobre 2015, 22:12:29 PM
Its tsop48 128Mb,right ?
Equivalent arent plug and play,you need to modify à little bit
It should be 64mbit 48 pin tsop.
MX26L6420 are OK for that capacity.
Just be sure to add an resistor or 2 diodes in serial since mx are running at 3.3v and originals maskrom runs at 5v
This is the cart:
(http://i1372.photobucket.com/albums/ag327/glstar7/039C841E-F1BE-481F-84F7-08B787C7D770_zpsb6a9p1xg.jpg)
This is the maskrom chip that should be bad:
(http://i1372.photobucket.com/albums/ag327/glstar7/63EAA791-AFB8-4DD7-B5F7-5DDC61997442_zpszzojd1nq.jpg)
This is some measurement made on the chip:
(http://i1372.photobucket.com/albums/ag327/glstar7/049D670F-0E13-4894-9F63-3654B0F58E6A_zpsm37xsrcz.jpg)
How to check if the maskrom is really bad?
How can i read this one?
Which is the rom (or other) i can use to replace it?
Just for information...
This is what Guru tell me about this problem....
they are 128M.
there is only one equivalent.
it is OKI MR27V12800J
Citation de: TylerDurden67 le Lundi 05 Octobre 2015, 22:12:29 PM
Its tsop48 128Mb,right ?
Equivalent arent plug and play,you need to modify à little bit
That what I was thinking about but since you told me there are 64mb.
Thanks for your information about equivalent BTW ^-