\begin{psmatrix}[mnode=oval, colsep=1.95cm, rowsep=1cm]
[mnode=R,name=vars]{\shortstack[l]{int s, z, c,\\\, strich, punkt;\\opcode aktop,opp;}} &
-[name=calc]{\shortstack{\textbf{calc}\\z:=z*10\\+(c-'0');}} &
+[name=int]{\shortstack{\textbf{int}\\z:=z*10\\+(c-'0');}} &
[name=blank]{\shortstack{\textbf{blank}}} \\
%%
[mnode=R,name=res]{sys\_res} &
%%
[name=idle]{\shortstack{\textbf{idle}\\strich:=0;\\punkt:=1;\\opp:=NOP;}} &
[name=read]{\shortstack{\textbf{read char}\\z:=0;\\s:=1;}} &
-[name=alu]{
+[name=calc]{
\shortstack{
- \textbf{ALU}\\
+ \textbf{calc}\\
siehe Listing
}
} \\
\nccurve[angleA=45,angleB=75,ncurvA=2,ncurvB=2]{read}{read}\ncput*{' '}
\ncarc[arcangle=0]{read}{sign}\ncput*[npos=.50]{'-'}
-\ncarc[arcangle=0]{sign}{calc}
-\ncarc[arcangle=50]{read}{calc}\ncput*[npos=.35]{c = '0'\dots{}'9'}
-\nccircle[angleA=0]{calc}{.78cm}\ncput*[npos=0.5]{c = '0'\dots{}'9'}
+\ncarc[arcangle=0]{sign}{int}
+\ncarc[arcangle=50]{read}{int}\ncput*[npos=.35]{c = '0'\dots{}'9'}
+\nccircle[angleA=0]{int}{.78cm}\ncput*[npos=0.5]{c = '0'\dots{}'9'}
-\ncarc[arcangle=15]{calc}{blank}\ncput*[npos=.50]{' '}
+\ncarc[arcangle=15]{int}{blank}\ncput*[npos=.50]{' '}
\nccircle[angleA=0]{blank}{.70cm}\ncput*[npos=0.5]{' '}
-\ncarc[arcangle=67]{blank}{alu}\ncput*[npos=.80]{aktop = '+','-','*','/'}
+\ncarc[arcangle=67]{blank}{calc}\ncput*[npos=.80]{aktop = '+','-','*','/'}
\ncarc[arcangle=0]{blank}{null}\ncput*[npos=.50]{aktop = '\textbackslash 0'}
-\ncarc[arcangle=0]{calc}{alu}\ncput*[npos=.70]{aktop = '+','-','*','/'}
-\ncarc[arcangle=0]{calc}{null}\ncput*[npos=.50]{aktop = '\textbackslash 0'}
-\ncarc[arcangle=0]{null}{alu}
+\ncarc[arcangle=0]{int}{calc}\ncput*[npos=.70]{aktop = '+','-','*','/'}
+\ncarc[arcangle=0]{int}{null}\ncput*[npos=.50]{aktop = '\textbackslash 0'}
+\ncarc[arcangle=0]{null}{calc}
-\ncarc[arcangle=0]{alu}{read}\ncput*[npos=.50]{calc\_done$\uparrow$}
-\ncarc[arcangle=0]{alu}{done}\ncput*[npos=.50]{aktop == DONE}
+\ncarc[arcangle=0]{calc}{read}\ncput*[npos=.45]{else}
+\ncarc[arcangle=0]{calc}{done}\ncput*[npos=.50]{aktop = DONE}
\end{document}