swarajya/eink

# Steps:
- [] eink takes 200x200 IMAGE_BLACK, IMAGE_RED or 800x480 IMAGE pixel inputs and sends them to eink.
- [] Take PS2 input hex and keep memory of image in shell program. Clear on backspace. Add and subtract sufficient pixels.
- [] Print $ on leftmost part. On enter click, test matches for program list, shift to next line if program name doesn't exist in memory.
When at last line, trigger change.
- [] Create program echo and echo2 that can be run in the shell program.
- [] Program call -> Run program -> Shell
Any interrupt -> Clear all program memory -> Shell

Use swap on sd card as RAM

$echo yo
yo
$echo2 yo
yoyo

# Steps2 = Steps ++:
- [] Read from FAT32 formatted sd card.
- [] Transfer all programs to sd card. Keep only shell and a program which fetches a list of all programs from sd card on flash.

- [] Keep a memory register that records UNIX timestamp. (Optional)