For the new input and output tip-tilts. Two input, two output, each requires four channels.
I have no idea. I don't know what the hardware is, or is supposed to be, connected to. DAC for WFS?? Was there at some point supposed to be fast output channels in the PSL?
Probably. I'm not as familiar with that system. I don't know what the availability of hardware channels is there. I'll investigate tomorrow.