kitrinx wrote:What hardware mod is required to work with the HPS cold reset from P2 on the IO board?
- Add pull up resistors to USER IO port.
Hewhoisred wrote:Sorgelig, will users with the old revision IO board have any problems with future devices utilizing the IO port? In other words, should we think about replacing the IO board with your new version? For those of us handy with the soldering iron, would it be easy to "mod" to the 5.5 board?
You don't need to replace the board. It's very easy to add pull up resistors. It's just 6 resistors with 10K each connected to each signal of USER I/O and 3.3v. Refer the v5.6 schematics.
I think it's better if devices designed specifically for MiSTer would include pull-up resistors on board. So modifications won't be required.
Hewhoisred wrote:Yes, thanks for the response. I imagine it would be fairly easy to fabricate a pass through device (dongle) with those resistors should we need to.
Sorgelig wrote:BOM looks like for v5.5
v5.6 has those pull up resistors added.
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