Wow tried putting this program in the HP Guide:

[cyrille de brébisson]

Hello,

export Sier2()
begin
rect;
local a=#0;
while a<#160 do
local b= #0;
while b<#160 do
pixon_p(a and b, a or b, 0);
b:= b+#1;
end;
a:= a+#1;
end;
freeze;
end;

Cyrille