In the previous post I mentioned at the end that the BIOS, running on the ATMega328p, was only capable of communication one way. There are a couple of mailbox memory locations that are used to pass keystrokes to the 8-bit CPUs (Z80 or 6502), yet no way of receiving data back, other than an acknowledgement that the keystroke has been processed. In order to make the BIOS a bit more BASIC-friendly, I needed to add …
First, an introduction. Near the end of July Bernado Kastrup (aka The Byte Attic) put a shout-out on Twitter: A few of my followers suggested I was that man, given my previous experience porting R.T.Russell’s excellent BBC Basic for Z80 to my BSX homebrew and the Spectrum Next. Although the prospect of a shiny new toy to play with was tempting, my projects are backing up, and I would probably not get started on this …
Since the last update, I’ve added a substantial number of new features to BBC Basic for Next The built-in Z80 assembler now supports the additional Z80N opcodes Realtime clock support (if fitted) Three additional video modes Line, circle, and filled triangle graphics primitives via PLOT and LINE commands VDU command now works SOUND command now works File I/O via esxDOS Improvements to the BASIC editor In addition to these features, there have been a number …
