README

                           JSNascom

               Nascom 2 emulator in Javascript

In brief, the minimal goal is to be able to fully support all the Nascom 2 software on nascomhomepage.com which would run on an standard Nascom 2 (except for a memory extension).

The Z80 emulator is borrowed from JSSpeccy, but the rest has be written from scratch.

Current features:

• Emulates: Z80, RAM, ROM, display, keyboard(*), serial IO
• Loading of NAS files as well as "tapes"
• Saving to tape
• [Persistent state currently broken]

(*) Keyboard support is interesting for a couple of reasons. Since there isn't a perfect mapping between "standard" PC 101 keyboards and the Nascom keyboard, for some applications it may be more appropriate to treat the keys more "physically". For example, shift-0 is ')' on the US version of the PC 101 keyboard, where it's the "up-arrow" on the Nascom, taking the ASCII code of the caret '^'. Generally for games the physical layout would make more sense.

This is work in progress and contributions are most welcome.

Tommy Thorn