Chummer throws an error about capacity, when you add more than one program as a plugin to a commlink (the Hermes Ikon at least)
Where do you get the cost of 200¥ for the custom OS? BTW where does it say that you can code or buy a custom OS? I can't find it in the books. It can't be true that commlink Firewall is caped at 5 (best stock FW +2).
Where do you get the cost of 200¥ for the custom OS? BTW where does it say that you can code or buy a custom OS? I can't find it in the books. It can't be true that commlink Firewall is caped at 5 (best stock FW +2).
The cost on Custom OS should actually be 0¥. This was probably something I missed when copy/pasting with another OS. It's really just there to add flexibility for players/GMs that allow a character to either build their own Commlink from scratch, write their own OS, or effectively have a custom OS without having to create a custom data file item. It doesn't take any plugins besides General (like the other Operating Systems) but shows that the Commlink at least has an OS. I've updated the Gear file to correct the cost.
Commlinks will support things all the way up to Rating 10, but as SR4A 222 under Upgrading Devices mentions (and you already pointed out), each part of a device can only be upgraded by +2. With all of the currently available Operating Systems having a max Firewall of 3, they'll only be allowed to go up to 5. If you add the Custom OS as the only Operating System to a Commlink, the Commlink will be allowed to choose up to Firewall (and System) 10 when adding OS Upgrade plugins. If someone creates their own OS in a custom data file and gives it a Firewall of 8, the Commlink it's attached to will also have the option of going up to Firewall 10. So all of that data is there but its visibility is limited by the devices.
There's a bug in the current build that is treating all items as consuming Capacity instead of just items that have square brackets. This is fixed in the next update which should be available this evening.