Nonpareil status

[brouhaha]

After a lot of work on simulating the ACT external flag pins correctly, and the older external flag 0 bank switching mechanism, I've got the the HP-91 and HP-19C simulation mostly working in Nonpareil.

The 97 key legends are wrong because I haven't had time to do the proper graphics. Also, I haven't yet figured out what some of the printer characters are (0x0f, 0x1b, 0x1e, 0x1f, 0x2a, 0x2f, 0x3c), so if there are functions that use those characters, they'll print wrong.

The 19C key legends are fine but the display formatting is wrong, because the 19C uses a decimal-inside-digit format like the classic, 67 and Topcat models, and it's not yet set up for that. Also the auto-repeat on paper advance doesn't yet work. I was baffled for a long time as to why key column 2 (scanned by the PICK chip) is also connected to one of the ACT key scanner inputs, and that's what it's for.

The 92 is not yet working at all, and I haven't yet investigated it.