Sorry. Being in PAL land, I only looked for them ones.
I cannot remember what NTSC ones I came across in my searches.
So, the PAL ones go to 1.1b. Where is the 1.1c NTSC version mentioned?
As a favour for going to the trouble to scan the manual (which I am eternally grateful for), I will do my best to find the latest driver disks for you though.
May take a while...