Not much of a gain in terms of usability (a bit of a loss in fact, things are
a bit slow and glitchy), but it's a necessary move if we want to use upcoming
grid-enabled userspace apps, such as a visual text editor.

This allows us to write contents from RS-232 directly to floppy! it works!

Sending the escape after its target made things complicated for upcoming
stuff I want to add. Although it makes `recv.asm` slightly larger, it's really
worth it.

Read-only support for now, hardcoded on drive :1. But it seems to work.

Can't wait to get a CFS running on this!

Lines should be terminated only with a CR on this system, not CRLF.