Maybe/Possibly.
Software Module Slots would surely very much follow suit with Military Slots in that they only allow a filtered list of modules in them? So Software Slots would only allow a filtered list of the Software Modules in the game. Ie the DC and SCA. And of course once there it can be utilised for other features to offered via software modules.
And with a cost applicable to these modules there's a choice to be made to fit them and a hurdle for noobs to achieve.
Again just my pref.
That would be one way to do it, but again, you would have to design a new core module to accept them, and then design a upgrade path and tiers for said core module. then there would be the stat for said module which would factor into using the Power stat. Now think about future proofing, if they add sub slots, they create computer card after computer card and eventually you get the same issue, module creep, in this case, in the sub module.
There are certain functions, BASE functions that should be part of the computer, certain specialized controllers, like limpets that are dedicated SUB-computers toward those tasks should be sub modules. Anykind of "science" package would be a sub module, things like that.