Difference between revisions of "SYSTEM ROM ERROR"

From NeoGeo Development Wiki
Jump to: navigation, search
m
m
 
Line 1: Line 1:
 
[[File:error_sysrom.png|thumb]]
 
[[File:error_sysrom.png|thumb]]
  
 +
The [[system ROM]]'s checksum was found to be incorrect. This error is rather rare because a bad readback of the system ROM would often cause the system to crash or get stuck in a [[Click of death|boot-loop]] before being able to show the error.
 +
 +
* PCB damage ? Address lines from the [[68k]] may be cut. If so, it's probably the higher ones.
 
* Did you buy that UniBios on eBay ? Check that the EPROM is [[memory speed|fast enough]].
 
* Did you buy that UniBios on eBay ? Check that the EPROM is [[memory speed|fast enough]].
* Corrupt EPROM ?
+
* If an EPROM is used and its window isn't covered, it might be partially erased. Erase it completely and reprogram it.
* PCB damage, address lines cut to [[system ROM]] ?
 
  
 
[[Category:Repairs]]
 
[[Category:Repairs]]

Latest revision as of 19:21, 11 April 2020

Error sysrom.png

The system ROM's checksum was found to be incorrect. This error is rather rare because a bad readback of the system ROM would often cause the system to crash or get stuck in a boot-loop before being able to show the error.

  • PCB damage ? Address lines from the 68k may be cut. If so, it's probably the higher ones.
  • Did you buy that UniBios on eBay ? Check that the EPROM is fast enough.
  • If an EPROM is used and its window isn't covered, it might be partially erased. Erase it completely and reprogram it.