Changes in nc100em 1.0:

- Speed control now works. It goes at 4.606MHz with real-time
  interrupts if it can - if it can't, it slows down interrupts to
  match, which should avoid breaking anything overly sensitive on the
  emulated NC.

- Some minor glibc-related fixes. (Well, sure they're minor, but it
  wouldn't have compiled without them. ;-))

- nc100.{card,ram,rom} are now stored in ~/nc100.

- Now comes with a `romdump' utility.

- Added man pages.

- Replaced the dire `zcndisk' with `zcntools', an mtools-like set of
  utils for working with ZCN disk images. This is so much better than
  zcndisk it hurts. :-) The only real thing missing is a way for
  `zcnls' to show files in all user areas.

- Various changes to the svgalib version:

  - Supports a larger display in addition to the normal one. Use Page
    Up to get the leftmost 320x64 part of the screen in 320x200 mode,
    Page Down to see the rightmost 320x64, and End to return to the
    usual display.

  - It now uses differential screen updating.

  - It's now entirely black-on-white, i.e. the NC100's screen is
    surrounded by white rather than black.

  - Uses svgalib's raw keyboard support rather than librawkey.

- If USE_MMAP_FOR_CARD is defined, it now uses mmap() to read/write
  the card image. This means a faster start/stop, and it should only
  access parts of the card file it needs to (this is certainly the
  case on Linux, anyway). It's especially useful for zcntools.

- A couple of minor speedups mean it's between 2 and 5% faster.

- `makecard' is now `makememcard'. It now does some error checking,
  and is installed by `make install'.

- Disabled interrupts no longer disable screen/keyboard update. (!)

- Supports ROM v1.00 (it only properly supported ROM v1.06 before).

- tnc100em now doesn't ever save the RAM.

- Previously serial input could have effectively generated multiple
  bytes from only one actual input byte - fixed that.

- The PD ROM is now builtin.

- Added `-p' option, to force use of PD ROM (useful for booting a
  file, for example).

- Fixed a stupid bug in the builtin PD ROM, where A was corrupted by
  the power-on context restoring routine.
