Switch the NC200 port to use VT52 emulation instead of ADM3a. #39
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… the state machine). Fix the nc200 port to actually use these rather than its home grown version. Also, discover that dseg is dangerous; stop using it.
…t. Find a fix a whole slew of bugs in the NC200 tty. There's no keyboard support yet.
…IOS. libcuss can't handle them, though.
…er being 8-bit safe.
…VT52 cursor keys.
…ther than trying to pack it cleverly. Doesn't appear to make a noticeable difference in real life, sadly.
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This allows the cursor keys to be distinguished from control keys. Unfortunately, the side effect is that now the cursor keys generate two byte sequences, which is harder for programs to parse; BBC Basic always treats the first byte as Escape, for example.
Also fix a whole slew of tty bugs in the the NC200 port.