dfnr2
Experienced Member
Hi all,
Somewhere around 2010 there was a group buy of IOB6120 PCBs and parts. I got all my parts from the gentleman who arranged the buy and built up the board without really critically reviewing the parts, and when I attached it to my (working) sbc6120, the whole system was unresponsive. I had planned to get back to this, but never did and rediscovered the board last week when cleaning up in the lab.
The first thing I notice is that the flash chip is a 29LV400, not a 29F400, which I gather from Vince's IOB6120 page, can be made to work with updated ROMS. The 29LV400 has a VCC_max of 3.6V, which means the protection diodes likely pulled the whole system voltage down below the working range. So that is probably an issue. I also had not realized at the time that new ROM and GAL images were necessary.
From poking around the web I see some references to some ECO's and errata that I am unable to hunt down. Does anyone have a pointer to the latest ROM and GAL images to support the 29F400 and any other bugfixes?
Also, the IOB6120 schematics from Jim Kearney's site seem to be from a very old version of Eagle. Does anyone happen to have imported this to Kicad? I saw a reference to an updated version of the board on the sparetimegizmos yahoo group, but that's gone and there are only a few posts in the groups.io group. Has there been any newer activity with respect to this board?
Thanks for any info and pointers,
Dave
Somewhere around 2010 there was a group buy of IOB6120 PCBs and parts. I got all my parts from the gentleman who arranged the buy and built up the board without really critically reviewing the parts, and when I attached it to my (working) sbc6120, the whole system was unresponsive. I had planned to get back to this, but never did and rediscovered the board last week when cleaning up in the lab.
The first thing I notice is that the flash chip is a 29LV400, not a 29F400, which I gather from Vince's IOB6120 page, can be made to work with updated ROMS. The 29LV400 has a VCC_max of 3.6V, which means the protection diodes likely pulled the whole system voltage down below the working range. So that is probably an issue. I also had not realized at the time that new ROM and GAL images were necessary.
From poking around the web I see some references to some ECO's and errata that I am unable to hunt down. Does anyone have a pointer to the latest ROM and GAL images to support the 29F400 and any other bugfixes?
Also, the IOB6120 schematics from Jim Kearney's site seem to be from a very old version of Eagle. Does anyone happen to have imported this to Kicad? I saw a reference to an updated version of the board on the sparetimegizmos yahoo group, but that's gone and there are only a few posts in the groups.io group. Has there been any newer activity with respect to this board?
Thanks for any info and pointers,
Dave