Alphabet Stew

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Brainfuck derivative using only letters (a – z) Created by User:DMC

Concept

  • A stack based esoteric programming language with exactly 26 commands
  • Each command is represented by a single character [a - z]
  • Numbers [0 - 9] are not used
  • Any character not within the set [a-z] is ignored
  • whitespace may be used for clarity

Description

  • an infinite array of cells
  • pc - program counter
  • p - data pointer
  • top - stack pointer
  • all memory is initialized to zero
  • commands that require two values to be pushed will pop two values and push the result onto the stack
  • commands that operate on one cell do not use the stack
  • '!' diagnostic command to print out memoiy cells up to highest value of the data pointer, does not have to be implemented
Instruction Operation Explanation
a shift right current memory
b
.
output ascii
c peek top of stack
d
<
p -= 1, p<0 is an error
e
+
increment memory
f jump left program counter -= current memory
g add push two
h jump right program counter += current memory
i
]
close loop
j clear stack top of stack = zero
k xor push two
l pop into current memory
m shift left current memory
n halt program stop
o push from current memory
p and push two
q or push two
r input decimal current cell = input mod 256
s
>
p += 1
t
[
open loop
u
-
decrement memory
v output decimal three digit zero filled
w exchange top two values on the stack
x subtract push two
y not (p) = not(p)
z
,
input one keypress

Examples

Hello, World!\n

oemmemosemmmmmeoooog
gseogcosemmmogscosee
emogdeeeossemmememmm
uosemmmmmosemmememmo
ddddouuuoouuuuuuuoss
sosogluuuuoltbli!

Fibonacci

First 14 values before it overflows 8 bits

emmmmuuussemmemdvsbdoeodtscvsbdgowdui!

Truth-machine

rtsetviiv

External resources