the little person computer is a model to learn about computer architecture
architecture
is uses the decimal system, with words of three-digits each.
it has ten instructions and 100 memory addresses.
example programs
written in the corresponding assembly language.
as part of the s-camino practice.
multiplication of two numbers
no labels
pure assembler version, no labels.
- 15 is the address for the result
- 16 is the address for 'a'
- 17 is the addres for 'b'
INP
STA 16
INP
STA 17
BRZ 11
LDA 16
ADD 15
STA 15
LDA 17
SUB 14
BRA 3
LDA 15
OUT
HLT
DAT 1
DAT 0
DAT 0
DAT 0
with labels
the same behavior as above, but using labels for easier programming and reading
inputs INP
STA a
INP
loop STA b
BRZ print // finish if b is 0
LDA a
ADD result
STA result
LDA b
SUB one
BRA loop
print LDA result
OUT
HLT
one DAT 1
result DAT 0
a DAT 0
b DAT 0
external links
little man computer - cpu simulator