Asdf

asdf is an esoteric programming language created by David Catt (user:David.werecat) which uses only 4 instructions:,  ,   and.

Instructions
The pointer begins at memory location 3. It can be moved left or right infinitely. IO is memory mapped. To read from the console, toggle the bit at location 0 twice without moving or hitting a loop; this will read one bit from the console into location 2. To write to the console, toggle the bit at location 1 twice without moving or hitting a loop; this will write one bit from location 2 to the console. Since all console IO is bytewise, all reads and writes to the console are buffered (8 bits).

Hello, world!
asaasaasssasaasssasaaaasssasaasssasaaaaaaaasssasaaaasssasaaaasssasaasssasaasssasaasssasaasssasaaaasssasaasssasaaaasssasaaaaaasssas aaaasssasaasssasaaaasssasaaaaaasssasaaaasssasaasssasaaaaaaaasssasaaaasssasaasssasaasssasaaaasssasaaaaaaaasssasaasssasaaaaaaaaaaaas ssasaaaaaasssasaasssasaaaaaasssasaasssasaaaasssasaasssasaaaaaaaasssasaasssasaaaaaasssasaaaasssasaasssasaaaasssasaaaasssasaasssasaa aasssasaaaaaasssasaaaasssasaaaasssasaasssasaaaaaaaasssasaasssasaaaaaaaasssasaa

Move the pointer right, regardless of toggle bit (note: may perform I/O at low addresses)
aasss

Move the pointer left, regardless of toggle bit (note: may perform I/O at low addresses)
aas

External resources

 * Visual Basic .NET interpreter and sample programs