This uses a special driver from the hard drive before the OS loads and thus is not usually cached and is reflected below in slower speeds. T0 also has the problem of not being tested by the system. Unless the card does this any memory errors do not get mapped out. All BIOS type card 'POST' their memory, but some do not show it. PS means one parallel and one serial included, PPSo means there is an option for 2 parallel and 1 serial port and so on.
NONE means no ports are provided or offered as an option.
Note if BC is specified it means a 32 bit card. Both cheap and with many memory options. Please note that the 16 bit cards scored just as well in most cases and are less money. They have been changed a bit though I think as they no longer work on the Model 90 or 95. They are 32 bit cards, but can also be used in a 16 bit slot.