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

We use zasm's ability to use labels in .equ directive.

We didn't do it before because for a while, we were in between scas
and zasm (scas was used in automated tests) so we needed to use the
lowest common denominator: zasm doesn't have macros and scas can't
use labels in .equ directives.

This forced us to add this layer of indirection. But now that we are
completely cut from scas' dependency, we can use this nice zasm's
ability.

ref #64.

Also, fix a bug in the shell where it would write outside the buffer's
bounds when given a completely filled buffer without a space character
in it.

It was a bad idea and having sms/pad interact directly with sms/vdp
is much simpler.

ref #64

Drop the "{pre,post}-collapse" thing and specify that the rc2014 recipes
are canonical.

closes #15

The goal is to avoid mixing those routines with "character devices"
(acia, vpd, kbd) which aren't block devices and have routines that
have different expectations.

This is a first step to fixing #64.