* .
* more updates, much more to do soon.
* hello world works again.
* fix key interrupts.
* remove the old book
* don't forget timers.
* we can just use search, duh.
* cleanup
* more bios
* finished most mmio, finished bios.
* dump some old macros that shouldn't have been pub to begin with.
* Update README.md
* for now, just make this a u16
* timers
* fix hello_world
* timer fix
* docs on timers
* block resetting work ram for now.
* put preserves_flags on bios calls as appropriate
* add a code page 437 tile sheet.
* docs.
* sound :( it's all bad but we'll fix it in 0.5
* move most backup files back into the lib.
* CI might work now?
* fix up non-serial examples.
* oops, gotta check out the repo.
* readme.
* Write some of the basic infrastructure for SRAM support.
* Implement battery-backed SRAM.
* Implement non-Atmel Flash chips.
* Implement support for Atmel Flash SRAM chips.
* Implement EEPROM support, various refactorings to SRAM system.
* Replace Save API with one based more cleanly on the flash chip API.
* Run rustfmt on new save media code.
* Improve test_savegame and fix remaining bugs caught by the changes.
* Proofreading on comments/documentation for save module.
* Fix addresses for read/verify routines in save::flash.
* Rebase save_api onto current master.
