diff --git a/src/ivoc/ivocmain.cpp b/src/ivoc/ivocmain.cpp
index 226b37cf11..079406f40c 100644
--- a/src/ivoc/ivocmain.cpp
+++ b/src/ivoc/ivocmain.cpp
@@ -162,9 +162,6 @@ std::ostream* OcIdraw::idraw_stream = 0;
 #endif
 /*****************************************************************************/
 extern void ivoc_cleanup();
-#if OCSMALL
-static char* ocsmall_argv[] = {0, "difus.hoc"};
-#endif
 #if defined(WIN32) && HAVE_IV
 extern HWND hCurrWnd;
 #endif
@@ -538,13 +535,6 @@ int ivocmain_session(int argc, const char** argv, const char** env, int start_se
 #endif  // !unix.
 
 #if HAVE_IV
-#if OCSMALL
-    our_argc = 2;
-    our_argv = new char*[2];
-    our_argv[0] = "Neuron";
-    our_argv[1] = ":lib:hoc:macload.hoc";
-    session = new Session("NEURON", our_argc, our_argv, options, properties);
-#else
 #if defined(WIN32)
     if (hoc_usegui) {
         session = new Session("NEURON", our_argc, (char**) our_argv, options, properties);
@@ -596,8 +586,6 @@ int ivocmain_session(int argc, const char** argv, const char** env, int start_se
     }
     delete[] nrn_props;
 
-#endif /*OCSMALL*/
-
     if (session) {
         session->style()->find_attribute("NSTACK", hoc_nstack);
         session->style()->find_attribute("NFRAME", hoc_nframe);
@@ -711,12 +699,6 @@ int ivocmain_session(int argc, const char** argv, const char** env, int start_se
 #if USENRNJAVA
     nrn_InitializeJavaVM();
 #endif
-#if OCSMALL
-    if (argc == 1) {
-        ocsmall_argv[0] = our_argv[0];
-        exit_status = oc.run(2, ocsmall_argv);
-    } else
-#endif
 #if defined(USE_PYTHON)
 #if HAVE_IV
         if (session && session->style()->value_is_on("python")) {
diff --git a/src/ivoc/pwman.cpp b/src/ivoc/pwman.cpp
index d0ec316a47..9ddfaaa9e3 100644
--- a/src/ivoc/pwman.cpp
+++ b/src/ivoc/pwman.cpp
@@ -1272,11 +1272,7 @@ PrintableWindowManager::PrintableWindowManager() {
         if (PrintableWindow::leader() != pwmi_->w_) {
             pwmi_->w_->replace_dismiss_action(NULL);
         }
-#if OCSMALL
-        pwmi_->w_->xplace(-800, 0);
-#else
         pwmi_->w_->xplace(0, 0);
-#endif
         //		pwmi_->w_->map();
         PrintableWindow::intercept(ocg);
     }
diff --git a/src/oc/audit.cpp b/src/oc/audit.cpp
index 3b26128078..6cfab93dce 100644
--- a/src/oc/audit.cpp
+++ b/src/oc/audit.cpp
@@ -40,7 +40,6 @@ maintain a list of xopen statements with the proper rcs version number.
 
 
 static void hoc_audit_init(void) {
-#if !OCSMALL
     if (retrieve_audit.mode) {
         /* clean up. there must have been an execerror */
         retrieve_audit.mode = 0;
@@ -50,11 +49,9 @@ static void hoc_audit_init(void) {
             retrieve_audit.pipe = (FILE*) 0;
         }
     }
-#endif
 }
 
 void hoc_audit_from_hoc_main1(int argc, const char** argv, const char** envp) {
-#if !OCSMALL
     /*ARGSUSED*/
     int i;
     char buf[200];
@@ -101,10 +98,8 @@ void hoc_audit_from_hoc_main1(int argc, const char** argv, const char** envp) {
         }
     }
     fprintf(faudit, "\n");
-#endif
 }
 
-#if !OCSMALL
 static void pipesend(int type, const char* s) {
     int err;
     if (audit_pipe) {
@@ -118,25 +113,19 @@ static void pipesend(int type, const char* s) {
         fflush(audit_pipe);
     }
 }
-#endif
 void hoc_audit_command(const char* buf) {
-#if !OCSMALL
     if (doaudit) {
         fprintf(faudit, "%s", buf);
     }
-#endif
 }
 
 void hoc_audit_from_xopen1(const char* fname, const char* rcs) {
-#if !OCSMALL
     if (!hoc_retrieving_audit() && doaudit && !rcs) {
         pipesend(1, fname);
     }
-#endif
 }
 
 void hoc_audit_from_final_exit(void) {
-#if !OCSMALL
     if (faudit) {
         fclose(faudit);
         faudit = 0;
@@ -146,20 +135,16 @@ void hoc_audit_from_final_exit(void) {
         audit_pipe = 0;
     }
     doaudit = 0;
-#endif
 }
 
 void hoc_Saveaudit(void) {
     int err;
-#if !OCSMALL
     err = hoc_saveaudit();
-#endif
     hoc_ret();
     hoc_pushx((double) err);
 }
 
 int hoc_saveaudit(void) {
-#if !OCSMALL
     static int n = 0;
     char buf[200];
     if (hoc_retrieving_audit() || !doaudit) {
@@ -178,34 +163,26 @@ int hoc_saveaudit(void) {
         doaudit = 0;
         return 0;
     }
-#endif
     return 1;
 }
 
 int hoc_retrieving_audit(void) {
-#if !OCSMALL
     return retrieve_audit.mode;
-#else
-    return 0;
-#endif
 }
 
 void hoc_Retrieveaudit(void) {
     int err, id;
-#if !OCSMALL
     if (ifarg(1)) {
         id = (int) chkarg(1, 0., 1e7);
     } else {
         id = 0;
     }
-#endif
     err = hoc_retrieve_audit(id);
     hoc_ret();
     hoc_pushx((double) err);
 }
 
 static void xopen_audit(void) {
-#if !OCSMALL
     char buf[200], *bp;
     constexpr auto rm_str = "rm ";
     strcpy(buf, rm_str);
@@ -218,11 +195,9 @@ static void xopen_audit(void) {
 #if 1
     nrn_assert(system(buf) >= 0);
 #endif
-#endif
 }
 
 int hoc_retrieve_audit(int id) {
-#if !OCSMALL
     RetrieveAudit save;
     char buf[200];
     char retdir[200];
@@ -241,12 +216,10 @@ int hoc_retrieve_audit(int id) {
     /*	pclose(retrieve_audit.pipe);*/
     retrieve_audit = save;
     fprintf(stderr, "should now delete %s", retdir);
-#endif
     return 1;
 }
 
 void hoc_xopen_from_audit(const char* fname) {
-#if !OCSMALL
     char buf[200];
     /* check the synchronization */
     nrn_assert(fgets(buf, 200, retrieve_audit.pipe));
@@ -255,5 +228,4 @@ void hoc_xopen_from_audit(const char* fname) {
         fprintf(stderr, "Warning: xopen_from_audit files have different names %s %s\n", fname, buf);
     }
     xopen_audit();
-#endif
 }
diff --git a/src/oc/debug.cpp b/src/oc/debug.cpp
index 2f8aeb5626..2e80df76ed 100644
--- a/src/oc/debug.cpp
+++ b/src/oc/debug.cpp
@@ -21,7 +21,6 @@ void hoc_debug(void) /* print the machine */
 
 /* running copy of calls to execute */
 void debugzz(Inst* p) {
-#if !OCSMALL
     {
         if (p->in == STOP)
             Printf("STOP\n");
@@ -142,5 +141,4 @@ void debugzz(Inst* p) {
         }
         p++;
     }
-#endif /*OCSMALL*/
 }
diff --git a/src/oc/getsym.cpp b/src/oc/getsym.cpp
index 05eb02f6a1..bf0297893d 100644
--- a/src/oc/getsym.cpp
+++ b/src/oc/getsym.cpp
@@ -2,9 +2,6 @@
 /* /local/src/master/nrn/src/oc/getsym.cpp,v 1.2 1996/02/16 16:19:26 hines Exp */
 /*
 getsym.cpp,v
- * Revision 1.2  1996/02/16  16:19:26  hines
- * OCSMALL used to throw out things not needed by teaching programs
- *
  * Revision 1.1.1.1  1994/10/12  17:22:08  hines
  * NEURON 3.0 distribution
  *
@@ -59,9 +56,6 @@ getsym.cpp,v
 
    hoc_execstr(char *s) compiles and executes the string
 */
-#if OCSMALL
-#else
-
 #include "hocgetsym.h"
 #include "parse.hpp"
 #include "hocparse.h"
@@ -172,4 +166,3 @@ void hoc_execstr(const char* cp) {
     hoc_pc = pcsav;
     hoc_free_list(&symlist);
 }
-#endif /*OCSMALL*/
diff --git a/src/oc/hoc.cpp b/src/oc/hoc.cpp
index 6eded05477..6820464bc6 100644
--- a/src/oc/hoc.cpp
+++ b/src/oc/hoc.cpp
@@ -96,10 +96,6 @@ void start_profile(int i) {}
 void add_profile(int i) {}
 void pr_profile(void) {}
 
-#if OCSMALL
-#define READLINE 0
-#endif
-
 #ifndef READLINE
 #define READLINE 1
 #endif
diff --git a/src/oc/nonlin.cpp b/src/oc/nonlin.cpp
index 467ac07349..aee3aebcbb 100644
--- a/src/oc/nonlin.cpp
+++ b/src/oc/nonlin.cpp
@@ -20,7 +20,6 @@ typedef struct elm* Elm;
 
 void hoc_dep_make(void) /* tag the variable as dependent with a variable number */
 {
-#if !OCSMALL
     Symbol* sym;
     unsigned* numpt = 0;
 
@@ -58,18 +57,15 @@ void hoc_dep_make(void) /* tag the variable as dependent with a variable number
     if (*numpt > 0)
         hoc_execerror(sym->name, "made dependent twice");
     *numpt = ++neqn;
-#endif
 }
 
 
 void init_access(void) /* zero the access array */
 {
-#if !OCSMALL
     if (hoc_access != (int*) 0)
         free((char*) hoc_access);
     hoc_access = (int*) ecalloc((neqn + 1), sizeof(int));
     hoc_var_access = -1;
-#endif
 }
 
 static void eqn_space(void);  /* reallocate space for matrix */
@@ -80,8 +76,6 @@ static unsigned maxeqn;
 
 void hoc_eqn_name(void) /* save row number for lhs and/or rhs */
 {
-#if !OCSMALL
-
     if (maxeqn != neqn) /* discard equations and reallocate space */
     {
         eqn_space();
@@ -95,11 +89,9 @@ void hoc_eqn_name(void) /* save row number for lhs and/or rhs */
         hoc_execerror("illegal equation name", (hoc_pc - 2)->sym->name);
     row = hoc_var_access;
     hoc_nopop();
-#endif
 }
 
 static void set_varble(void) { /* set up varble array by searching for tags */
-#if !OCSMALL
     Symbol* sp;
 
     for (sp = hoc_symlist->first; sp != (Symbol*) 0; sp = sp->next) {
@@ -117,14 +109,12 @@ static void set_varble(void) { /* set up varble array by searching for tags */
             }
         }
     }
-#endif
 }
 
 static double Delta = .001; /* variable variation */
 
 void hoc_eqinit(void) /* built in function to initialize equation solver */
 {
-#if !OCSMALL
     Symbol* sp;
 
     if (ifarg(1))
@@ -140,20 +130,17 @@ void hoc_eqinit(void) /* built in function to initialize equation solver */
     }
     neqn = 0;
     eqn_space();
-#endif
     hoc_ret();
     hoc_pushx(0.);
 }
 
 void hoc_eqn_init(void) /* initialize equation row */
 {
-#if !OCSMALL
     struct elm* el;
 
     for (el = rowst[row]; el != (struct elm*) 0; el = el->c_right)
         el->value = 0.;
     rhs[row] = 0.;
-#endif
 }
 
 void hoc_eqn_lhs(void) /* add terms to left hand side */
@@ -168,7 +155,6 @@ void hoc_eqn_rhs(void) /* add terms to right hand side */
 
 
 static void eqn_side(int lhs) {
-#if !OCSMALL
     int i;
     struct elm* el;
     double f0, f1;
@@ -199,11 +185,9 @@ static void eqn_side(int lhs) {
         el->value += (f1 - f0) / Delta;
     }
     hoc_pc++;
-#endif
 }
 
 static void eqn_space(void) { /* reallocate space for matrix */
-#if !OCSMALL
     int i;
     struct elm* el;
 
@@ -239,19 +223,15 @@ static void eqn_space(void) { /* reallocate space for matrix */
         eqord[i] = i;
         varord[i] = i;
     }
-#endif
 }
 
 void hoc_Prmat(void) {
-#if !OCSMALL
     prmat();
-#endif
     hoc_ret();
     hoc_pushx(1.);
 }
 
 void hoc_solve(void) {
-#if !OCSMALL
     /* Sum is a measure of the dependent variable accuracy
        and how well the equations are solved */
 
@@ -277,9 +257,6 @@ void hoc_solve(void) {
         }
         rowst[i] = colst[i] = (struct elm*) 0;
     }
-#else
-    double sum = 0;
-#endif
     hoc_ret();
     hoc_pushx(sum);
 }
diff --git a/src/oc/xred.cpp b/src/oc/xred.cpp
index 8a9145d390..90946d3a57 100644
--- a/src/oc/xred.cpp
+++ b/src/oc/xred.cpp
@@ -4,9 +4,6 @@
 /* /local/src/master/nrn/src/oc/xred.cpp,v 1.3 1996/02/16 16:19:33 hines Exp */
 /*
 xred.cpp,v
- * Revision 1.3  1996/02/16  16:19:33  hines
- * OCSMALL used to throw out things not needed by teaching programs
- *
  * Revision 1.2  1995/04/03  13:58:43  hines
  * Port to MSWindows
  *
@@ -63,7 +60,6 @@ int hoc_ired(const char* prompt, int defalt, int min, int max) {
     input is freeform as scanf can make it.
 */
 double hoc_xred(const char* prompt, double defalt, double min, double max) {
-#if !OCSMALL
     char istr[80], c[2];
     double input;
     for (;;) {
@@ -91,9 +87,6 @@ double hoc_xred(const char* prompt, double defalt, double min, double max) {
         }
         IGNORE(fprintf(stderr, "input error\n"));
     }
-#else
-    return 0.;
-#endif
 }
 
 
@@ -102,20 +95,15 @@ double hoc_xred(const char* prompt, double defalt, double min, double max) {
 */
 
 void hoc_Sred(void) {
-#if !OCSMALL
     char defalt[80], **pdefalt;
     double x;
     strcpy(defalt, gargstr(2));
     pdefalt = hoc_pgargstr(2);
     x = (double) hoc_sred(gargstr(1), defalt, gargstr(3));
     hoc_assign_str(pdefalt, defalt);
-#else
-    double x = 0.;
-#endif
     hoc_ret();
     hoc_pushx(x);
 }
-#if !OCSMALL
 
 /*   sred.cpp  SW Jaslove    March 23, 1992
           n = sred(prompt,default,charlist)
@@ -165,5 +153,3 @@ int hoc_sred(const char* prompt, char* defalt, char* charlist) {
     }
     return 0;
 }
-
-#endif