Also, make empty strings be parsed as invalid by parseDecimal.

And made them shorter in name. The new ascii.h file allow reuse in userspace
code.

Let's see where it will lead us...

Because scas isn't used as a reference anymore, no need to blacklist its bugs
anymore.

ref #41

There's a lot of looping through that table. At first, I wanted to add some
bisecting, but 16-bit additions and multiplications involved made the idea a
bit less appealing. I went with a very basic, hardcoded index which should
speed things quite a bit at a minimal complexity cost.

There was a little bit of cruft.

This allow a lot more characters to fit on that tiny screen...

ref #41

There's a couple of bit fiddling instructions that didn't have their
IX/IY variant implemented yet and without this commit, each of them
would have required a special routine. Not anymore.

We now require less special handling.

It was actually counted in 8-bit mode...

This reduces the need for special handling routine and will make my
life easier in my upcoming generic tratment of IX/IY prefix in upcodes

Giving I/O responsibility to spitUpcode gives us wiggle room for
upcoming refactorings.

That's a lot of code for such a small change, but there's a big difference
between 5 pixels and 4 pixels: 4 pixels requires compositing.

Also, fix visual glitch on line wrap.

ref #41

Previously, on real hardware (emulator behaved fine), we would routinely
get repeat keys unless pressing the button very fast. This commit solves that.

Previously, when being in A-Lock mode, activating Alpha wouldn't make
us go temporarily in digit mode, as is expected.

LCD RAM persists between reboots, makingit necessary to clear it.

ref #41

ref #41

no a-lock or lowercase yet.

ref #41

no alpha yet.

ref #41

For now, only digits are scanned. Lifted from my "tiseg7" example.

ref #41

There's no scrolling yet...

ref #41

ref #41

This was mostly lifted from my "tihello" example, but it required significant
adjustments.

This commit also introduces a font management system. A lot of fonts are
available online, but sources aren't always clear so to avoid copyright
landmines, I re-created my first 5x7 font from scratch.

As it is now, this resulting ROM gets "Collapse OS>" to be displayed on the
LCD screen. Much work still left to do.

ref #41

Most OS don't have python3 in /usr/bin/python...

ref #64