PIONEER R1 update

These are the changes for the 2nd release R1 of my PIONEER project:

• I extended the 6-char 7-segment LED display to 16 characters

• I introduced Intel's 8279 Programmable Keyboard/Display Interface

• The first PIONEER game is available: Haunted House text adventure

• Alphanumericals ("0"-"9", "A"-"Z") and punctuation symbols are available now

• I moved to rasm assembler because of support for undocumented instructions

• I provide binary ROM and Intel hex format images

Unfortunately I finished the R1 release more than one year ago but due to other life projects unrelated to retrocomputing I didn't manage to update the documentation and clean up the code until now. Hopefully there will be no complaints :-)

A few comments:

• Intel's 8279 PKDI device is used to access the 20-key keyboard and the 16-character display

• Haunted House is Robert Arnstein's text adventure published in 1979 for the TRS-80

• It's impossible to obtain a unique, unambiguous representation of all letters of the Latin alphabet with a 7-segment code but the correct interpretation results from the context

• PIONEER R1 is a Haunted House-only release

A detailed description of all changes will follow soon.