SailorLodestar
Professional
“I/O BD not connected to game BD”
- Thread starter SailorLodestar
- Start date
MetalliC
Champion
you'll get this error if anything wrong in the chain: 315-6146 I/O MCU -> ADM485 IC80 -> CN2 connector -> filter board -> JVS connector -> cable -> JVS I/O board.
in 1st place worth try to replace JVS I/O and its cable, if it doesn't solve the problem worth to check if JVS connector at filter board is not lossy/broken, and also reseat filter board and make sure mobo's CN2 sits well with it.
if this will not helps it's probably something really broken in described above chain, like fried ADM485 transceiver or something else.
btw, may I ask you about small favor? take a photo of BIOS CRT test page 2 (the one with full screen grid)
in 1st place worth try to replace JVS I/O and its cable, if it doesn't solve the problem worth to check if JVS connector at filter board is not lossy/broken, and also reseat filter board and make sure mobo's CN2 sits well with it.
if this will not helps it's probably something really broken in described above chain, like fried ADM485 transceiver or something else.
btw, may I ask you about small favor? take a photo of BIOS CRT test page 2 (the one with full screen grid)
it would be great if we could get one of these ROM boards dumped too!
MetalliC
Champion
yeah, at least socketed EPROMs, which should not be a big deal.