diff --git a/docs/history.txt b/docs/history.txt
index c6cdfcd..e4cb6c8 100644
--- a/docs/history.txt
+++ b/docs/history.txt
@@ -1,5 +1,19 @@
-2001 Mar 28 - Build 2023
+2001 Mar 30 - Build 2023
 -------- Bart Oldeman (bart.oldeman@bristol.ac.uk)
++ Fixes  Tom: Kernel alloc initialises to 0. This avoids some weird errors.
+              Implemented default divide by 0 handler (INT 0)
+              FILES= fixes from config.sys. fatfs.c ignored it and always
+              used the default of 16.
+              Misc debug code removal.
+              int 21/ax=3306 report running HIGH fix.
+              int 21/ah=69 : save CX
+              InitializeAllBPBs() or MakeNortonDiskEditorHappy()
+              More extended information if MCB chain corruption occurs.
+         Bart: getdpb fixes (int 21/ah=32).
+               fix carry handling in int 21/ah=5e.   
+               fix {get,set}_machine_name in network.c
++ Add    Support for SHELLHIGH in config.sys
+2001 Mar 28 - Build 2023
 + Fixes  Bug fix release 2023b: dsk.c (reported by Nagy Daniel), inthndlr and
 	 int25/26 fixes by Tom Ehlert.
 2001 Mar 27 - Build 2023
diff --git a/kernel/config.c b/kernel/config.c
index 3f39222..993df89 100644
--- a/kernel/config.c
+++ b/kernel/config.c
@@ -40,6 +40,9 @@ static BYTE *RcsId = "$Id$";
 
 /*
  * $Log$
+ * Revision 1.14  2001/03/30 19:30:00  bartoldeman
+ * Misc fixes and implementation of SHELLHIGH. See history.txt for details.
+ *
  * Revision 1.13  2001/03/27 20:27:27  bartoldeman
  * dsk.c (reported by Nagy Daniel), inthndlr and int25/26 fixes by Tom Ehlert.
  *
@@ -197,6 +200,7 @@ INIT BOOL LoadDevice(BYTE * pLine, COUNT top, COUNT mode);
 INIT VOID Dosmem(BYTE * pLine);
 INIT VOID Country(BYTE * pLine);
 INIT VOID InitPgm(BYTE * pLine);
+INIT VOID InitPgmHigh(BYTE * pLine);
 INIT VOID Switchar(BYTE * pLine);
 INIT VOID CfgFailure(BYTE * pLine);
 INIT VOID Stacks(BYTE * pLine);
@@ -251,6 +255,7 @@ static struct table commands[] =
         /* rem is never executed by locking out pass                    */
   {"REM", 0, CfgFailure},
   {"SHELL", 1, InitPgm},
+  {"SHELLHIGH", 1, InitPgmHigh},
   {"STACKS", 1, Stacks},
   {"SWITCHAR", 1, Switchar},
   {"SCREEN", 1, sysScreenMode}, /* JPP */
@@ -322,6 +327,8 @@ INIT void PreConfig(void)
   /* Initialize the file table                                    */
   f_nodes = (struct f_node FAR *)
       KernelAlloc(Config.cfgFiles * sizeof(struct f_node));
+
+  f_nodes_cnt = Config.cfgFiles;
   /* sfthead = (sfttbl FAR *)&basesft; */
   /* FCBp = (sfttbl FAR *)&FcbSft; */
   FCBp = (sfttbl FAR *)
@@ -399,7 +406,9 @@ INIT void PostConfig(void)
   /* Initialize the file table                                    */
   f_nodes = (struct f_node FAR *)
       KernelAlloc(Config.cfgFiles * sizeof(struct f_node));
-  /* sfthead = (sfttbl FAR *)&basesft; */
+  
+  f_nodes_cnt = Config.cfgFiles;   /* and the number of allocated files */
+/* sfthead = (sfttbl FAR *)&basesft; */
   /* FCBp = (sfttbl FAR *)&FcbSft; */
   FCBp = (sfttbl FAR *)
       KernelAlloc(sizeof(sftheader)
@@ -920,6 +929,13 @@ INIT static VOID Stacks(BYTE * pLine)
   }
 }
 
+INIT static VOID InitPgmHigh(BYTE * pLine)
+{
+  InitPgm(pLine);
+  Config.cfgP_0_startmode = 0x80;
+}
+
+
 INIT static VOID InitPgm(BYTE * pLine)
 {
   /* Get the string argument that represents the new init pgm     */
@@ -931,6 +947,8 @@ INIT static VOID InitPgm(BYTE * pLine)
 
   /* and add a DOS new line just to be safe                       */
   strcat(Config.cfgInitTail, "\r\n");
+
+  Config.cfgP_0_startmode = 0;
 }
 
 INIT static VOID Break(BYTE * pLine)
@@ -1101,6 +1119,8 @@ INIT BYTE FAR *KernelAlloc(WORD nBytes)
   else
     lpBase += nBytes;
 
+  fmemset( lpAllocated, 0, nBytes);
+
   return lpAllocated;
 }
 #endif
diff --git a/kernel/dosfns.c b/kernel/dosfns.c
index f741078..cb22f0b 100644
--- a/kernel/dosfns.c
+++ b/kernel/dosfns.c
@@ -37,6 +37,9 @@ static BYTE *dosfnsRcsId = "$Id$";
  * /// Added SHARE support.  2000/09/04 Ron Cemer
  *
  * $Log$
+ * Revision 1.12  2001/03/30 19:30:06  bartoldeman
+ * Misc fixes and implementation of SHELLHIGH. See history.txt for details.
+ *
  * Revision 1.11  2001/03/21 02:56:25  bartoldeman
  * See history.txt for changes. Bug fixes and HMA support are the main ones.
  *
@@ -1419,7 +1422,7 @@ COUNT DosSetFattr(BYTE FAR * name, UWORD FAR * attrp)
 
 BYTE DosSelectDrv(BYTE drv)
 {
-  if ((0 <= drv) && (drv <= (lastdrive -1 )) &&(CDSp->cds_table[drv].cdsFlags & 0xf000))
+  if ((0 <= drv) && (drv < lastdrive) &&(CDSp->cds_table[drv].cdsFlags & 0xf000))
   {
     current_ldt = &CDSp->cds_table[drv];
     default_drive = drv;
diff --git a/kernel/entry.asm b/kernel/entry.asm
index 967bbdc..bf4ad99 100644
--- a/kernel/entry.asm
+++ b/kernel/entry.asm
@@ -28,6 +28,9 @@
 ; $Id$
 ;
 ; $Log$
+; Revision 1.9  2001/03/30 19:30:06  bartoldeman
+; Misc fixes and implementation of SHELLHIGH. See history.txt for details.
+;
 ; Revision 1.8  2001/03/27 20:27:43  bartoldeman
 ; dsk.c (reported by Nagy Daniel), inthndlr and int25/26 fixes by Tom Ehlert.
 ;
@@ -192,6 +195,39 @@ _RestartSysCall:
                 jmp     short int21_reentry     ; restart the system call
 
 
+;
+; interrupt zero divide handler:
+; print a message 'Interrupt divide by zero'
+; Terminate the current process
+;
+;       VOID INRPT far
+;       int20_handler(iregs UserRegs)
+;
+
+divide_by_zero_message db 0dh,0ah,'Interrupt divide by zero',0dh,0ah,0
+
+                global reloc_call_int0_handler
+reloc_call_int0_handler:
+                
+                mov si,divide_by_zero_message
+                
+zero_message_loop:
+                mov al, [cs:si]
+                test al,al
+                je   zero_done
+
+                inc si
+                mov bx, 0070h
+                mov ah, 0eh
+                
+                int  10h
+                
+                jmp short zero_message_loop
+                
+zero_done:
+                mov ax,04c7fh       ; terminate with errorlevel 127                                                
+                int 21h
+
 ;
 ; Terminate the current process
 ;
diff --git a/kernel/fatfs.c b/kernel/fatfs.c
index c3766e4..0d574d3 100644
--- a/kernel/fatfs.c
+++ b/kernel/fatfs.c
@@ -36,6 +36,9 @@ BYTE *RcsId = "$Id$";
 
 /*
  * $Log$
+ * Revision 1.13  2001/03/30 19:30:06  bartoldeman
+ * Misc fixes and implementation of SHELLHIGH. See history.txt for details.
+ *
  * Revision 1.12  2001/03/24 22:13:05  bartoldeman
  * See history.txt: dsk.c changes, warning removal and int21 entry handling.
  *
@@ -464,7 +467,7 @@ static void merge_file_changes(struct f_node FAR *fnp, int collect) {
     int i;
 
     if (!IsShareInstalled()) return;
-    for (i = 0; i < NFILES; i++) {
+    for (i = 0; i < f_nodes_cnt; i++) {
         fnp2 = &f_nodes[i];
         if (   (fnp != (struct f_node FAR *)0)
             && (fnp != fnp2)
@@ -2078,7 +2081,7 @@ struct f_node FAR *get_f_node(void)
 {
   REG i;
 
-  for (i = 0; i < NFILES; i++)
+  for (i = 0; i < f_nodes_cnt; i++)
   {
     if (f_nodes[i].f_count == 0)
     {
@@ -2297,7 +2300,7 @@ COUNT media_check(REG struct dpb * dpbp)
 /* translate the fd into an f_node pointer */
 struct f_node FAR *xlt_fd(COUNT fd)
 {
-  return fd >= NFILES ? (struct f_node FAR *)0 : &f_nodes[fd];
+  return fd >= f_nodes_cnt ? (struct f_node FAR *)0 : &f_nodes[fd];
 }
 
 /* translate the f_node pointer into an fd */
diff --git a/kernel/globals.h b/kernel/globals.h
index 0d4ee3d..ed484c2 100644
--- a/kernel/globals.h
+++ b/kernel/globals.h
@@ -36,6 +36,9 @@ static BYTE *Globals_hRcsId = "$Id$";
 
 /*
  * $Log$
+ * Revision 1.8  2001/03/30 19:30:06  bartoldeman
+ * Misc fixes and implementation of SHELLHIGH. See history.txt for details.
+ *
  * Revision 1.7  2001/03/21 02:56:26  bartoldeman
  * See history.txt for changes. Bug fixes and HMA support are the main ones.
  *
@@ -604,6 +607,8 @@ GLOBAL struct dpb
 GLOBAL struct f_node FAR
 * f_nodes;                      /* pointer to the array                 */
 
+GLOBAL UWORD f_nodes_cnt;       /* number of allocated f_nodes          */
+
 GLOBAL struct buffer
 FAR *lastbuf;                   /* tail of ditto                        */
 /*  FAR * buffers;              /* pointer to array of track buffers    */
@@ -637,6 +642,7 @@ GLOBAL struct config
   WORD cfgCSYS_memory;         /* number of bytes required for the NLS pkg;
                                    0 if none */
   VOID FAR *cfgCSYS_data;      /* where the loaded data is for PostConfig() */
+  UBYTE cfgP_0_startmode;      /* load command.com high or not */
 } Config
 #ifdef MAIN
 =
@@ -656,6 +662,7 @@ GLOBAL struct config
      ,""                   /* filename */
      ,0                        /* amount required memory */
      ,0                        /* pointer to loaded data */
+     ,0                        /* strategy for command.com is low by default */
 };
 #else
 ;
diff --git a/kernel/inithma.c b/kernel/inithma.c
index a2d055b..eb1cd1f 100644
--- a/kernel/inithma.c
+++ b/kernel/inithma.c
@@ -75,6 +75,9 @@ static BYTE *RcsId = "$Id$";
 
 /*
  * $Log$
+ * Revision 1.2  2001/03/30 19:30:06  bartoldeman
+ * Misc fixes and implementation of SHELLHIGH. See history.txt for details.
+ *
  * Revision 1.1  2001/03/21 03:01:45  bartoldeman
  * New file by Tom Ehlert for HMA initialization.
  *
@@ -233,8 +236,6 @@ int MoveKernelToHMA()
     unsigned  len;
     
     
-    int3();
-    
     
     if (DosLoadedInHMA) 
     {
@@ -306,7 +307,6 @@ int MoveKernelToHMA()
         
         HMAFree = FP_OFF(HMADest)+len;  /* first free byte after HMA_TEXT */
         
-        int3();
         
     }    
     {
@@ -388,13 +388,15 @@ int MoveKernelToHMA()
         
         DosLoadedInHMA = TRUE;
     }        
+    
+    /* report the fact we are running high thorugh int 21, ax=3306 */
+    version_flags |= 0x10;    
+    
 
-    int3();
     return TRUE;
     
 errorReturn:
     printf("HMA errors, not doing HMA\n");
-    int3();
     return FALSE;
 }
 
@@ -415,7 +417,7 @@ errorReturn:
 void InstallVDISK()
     {
         static struct {                /* Boot-Sektor of a RAM-Disk */
- 	                 BYTE dummy1[3];   /* HIMEM.SYS uses 3, but FDXMS uses 2 */
+ 	                 UBYTE dummy1[3];   /* HIMEM.SYS uses 3, but FDXMS uses 2 */
 	                 char Name[5];
 	                 BYTE dummy2[3];
 	                 WORD BpS;
@@ -529,6 +531,8 @@ VOID FAR *HMAalloc(COUNT bytesToAllocate)
 
     /*printf("HMA allocated %d byte at %x\n", bytesToAllocate, HMAptr); */
     
+    fmemset( HMAptr,0, bytesToAllocate);
+    
     return HMAptr;
 }
 
diff --git a/kernel/inthndlr.c b/kernel/inthndlr.c
index 72eb964..abe4d16 100644
--- a/kernel/inthndlr.c
+++ b/kernel/inthndlr.c
@@ -36,6 +36,9 @@ BYTE *RcsId = "$Id$";
 
 /*
  * $Log$
+ * Revision 1.17  2001/03/30 19:30:06  bartoldeman
+ * Misc fixes and implementation of SHELLHIGH. See history.txt for details.
+ *
  * Revision 1.16  2001/03/27 20:27:43  bartoldeman
  * dsk.c (reported by Nagy Daniel), inthndlr and int25/26 fixes by Tom Ehlert.
  *
@@ -840,7 +843,10 @@ dispatch:
       if (r->DL <= (lastdrive - 1))
       {
         struct dpb FAR *dpb = CDSp->cds_table[r->DL].cdsDpb;
-        if (dpb == 0)
+        if (dpb == 0 ||
+            (CDSp->cds_table[r->DL].cdsFlags & CDSNETWDRV) ||
+            FP_SEG(dpb) != FP_SEG(&dpb) || /* check if it's a NEAR pointer */
+             media_check((struct dpb *)dpb) < 0)
         {
           r->AL = 0xff;
           CritErrCode = 0x0f;
@@ -1485,6 +1491,7 @@ dispatch:
       break;
 
     case 0x5e:
+      CLEAR_CARRY_FLAG();
       switch (r->AL)
       {
         case 0x00:
@@ -1500,13 +1507,9 @@ dispatch:
 	    COUNT result;
             result = int2f_Remote_call(REM_PRINTSET, r->BX, r->CX, r->DX, (MK_FP(r->ES, r->DI)), r->SI, (MK_FP(r->DS, Int21AX)));
 	    r->AX = result;
-	    if (result != SUCCESS) {
-            goto error_out;
-	    } else {
-	  	    CLEAR_CARRY_FLAG();
-	    }
-          break;
-      }
+	    if (result != SUCCESS) goto error_out;
+            break;
+          }
       }
       break;
 
@@ -1679,6 +1682,7 @@ dispatch:
       rc = ( r->BL == 0 ? default_drive : r->BL - 1);
       if (rc <= (lastdrive -1))
       {
+        UWORD saveCX = r->CX;
         if (CDSp->cds_table[rc].cdsFlags & CDSNETWDRV) {
           goto error_invalid;
         }
@@ -1695,6 +1699,7 @@ dispatch:
             rc = DosDevIOctl(r, (COUNT FAR *) & rc1);
             break;
         }
+        r->CX = saveCX;
         if (rc1 != SUCCESS)
         {
           r->AX = -rc1;
diff --git a/kernel/kernel.asm b/kernel/kernel.asm
index f844f0c..9b8db85 100644
--- a/kernel/kernel.asm
+++ b/kernel/kernel.asm
@@ -28,6 +28,9 @@
 ; $Id$
 ;
 ; $Log$
+; Revision 1.8  2001/03/30 19:30:06  bartoldeman
+; Misc fixes and implementation of SHELLHIGH. See history.txt for details.
+;
 ; Revision 1.7  2001/03/21 02:56:26  bartoldeman
 ; See history.txt for changes. Bug fixes and HMA support are the main ones.
 ;
@@ -235,9 +238,7 @@ dos_data        db      0
 
                 times (0eh - ($ - DATASTART)) db 0
                 global  _NetBios
-_NetBios        db      0               ; NetBios Number
-                global  _Num_Name
-_Num_Name       db      0
+_NetBios        dw      0               ; NetBios Number
 
                 times (26h - 0ch - ($ - DATASTART)) db 0
 
@@ -829,7 +830,10 @@ _low_int26_handler: jmp far reloc_call_low_int26_handler
 _int27_handler: jmp far reloc_call_int27_handler
                 call near forceEnableA20
 
-
+                global  _int0_handler
+                extern  reloc_call_int0_handler
+_int0_handler:  jmp far reloc_call_int0_handler
+                call near forceEnableA20
 
                 global  _cpm_entry
                 extern  reloc_call_cpm_entry
diff --git a/kernel/main.c b/kernel/main.c
index c53f278..dc6e2b8 100644
--- a/kernel/main.c
+++ b/kernel/main.c
@@ -39,6 +39,9 @@ static BYTE *mainRcsId = "$Id$";
 
 /*
  * $Log$
+ * Revision 1.10  2001/03/30 19:30:06  bartoldeman
+ * Misc fixes and implementation of SHELLHIGH. See history.txt for details.
+ *
  * Revision 1.9  2001/03/25 17:11:54  bartoldeman
  * Fixed sys.com compilation. Updated to 2023. Also: see history.txt.
  *
@@ -184,6 +187,7 @@ void __int__(int);              /* TC 2.01 requires this. :( -- ror4 */
 
 INIT VOID main(void)
 {
+    setvec(0, int0_handler);        /* zero divide */
     setvec(1, empty_handler);       /* single step */
     setvec(3, empty_handler);       /* debug breakpoint */
     
@@ -209,6 +213,30 @@ INIT VOID main(void)
   kernel();
 }
 
+/*
+    InitializeAllBPBs()
+    
+    or MakeNortonDiskEditorHappy()
+
+    it has been determined, that FDOS's BPB tables are initialized,
+    only when used (like DIR H:).
+    at least one known utility (norton DE) seems to access them directly.
+    ok, so we access for all drives, that the stuff gets build
+*/
+
+void InitializeAllBPBs()
+{
+  static char filename[] = "A:-@JUNK@-.TMP";
+  int drive,fileno;
+  for (drive = 'Z'; drive >= 'C'; drive--)
+    {
+      filename[0] = drive;
+      if ((fileno = dos_open((BYTE FAR *) filename, O_RDONLY)) >= 0)
+        dos_close(fileno);
+    }
+}    
+
+
 INIT void init_kernel(void)
 {
   COUNT i;
@@ -296,6 +324,9 @@ INIT void init_kernel(void)
   version_flags = 0;
   pDirFileNode = 0;
   dosidle_flag = 0;
+  
+  InitializeAllBPBs();
+  
 }
 
 INIT VOID FsConfig(VOID)
@@ -303,7 +334,6 @@ INIT VOID FsConfig(VOID)
   REG COUNT i;
   date Date;
   time Time;
-  BYTE x;
 
   /* Get the start-up date and time                               */
   Date = dos_getdate();
@@ -439,7 +469,6 @@ INIT void kernel()
   seg asize;
   BYTE FAR *ep,
    *sp;
-  COUNT ret_code;
 #ifndef KDB
   static BYTE *path = "PATH=.";
 #endif
diff --git a/kernel/memmgr.c b/kernel/memmgr.c
index 3b801ff..353cf4c 100644
--- a/kernel/memmgr.c
+++ b/kernel/memmgr.c
@@ -35,6 +35,9 @@ static BYTE *memmgrRcsId = "$Id$";
 
 /*
  * $Log$
+ * Revision 1.10  2001/03/30 19:30:06  bartoldeman
+ * Misc fixes and implementation of SHELLHIGH. See history.txt for details.
+ *
  * Revision 1.9  2001/03/21 02:56:26  bartoldeman
  * See history.txt for changes. Bug fixes and HMA support are the main ones.
  *
@@ -518,7 +521,7 @@ COUNT DosMemChange(UWORD para, UWORD size, UWORD * maxSize)
 COUNT DosMemCheck(void)
 {
   REG mcb FAR *p;
-  REG mcb FAR *u;
+  REG mcb FAR *pprev = 0;
 
   /* Initialize                                           */
   p = para2far(first_mcb);
@@ -528,9 +531,15 @@ COUNT DosMemCheck(void)
   {
     /* check for corruption                         */
     if (p->m_type != MCB_NORMAL)
+      {
+      printf("dos mem corrupt, first_mcb=%04x\n", first_mcb);
+      hexd("prev " ,pprev,16);
+      hexd("notMZ",p,16);
       return DE_MCBDESTRY;
+      }
 
     /* not corrupted - but not end, bump the pointer */
+    pprev = p;
     p = nxtMCB(p);
   }
   return SUCCESS;
diff --git a/kernel/network.c b/kernel/network.c
index 79f2edf..7d0afad 100644
--- a/kernel/network.c
+++ b/kernel/network.c
@@ -36,6 +36,9 @@ static BYTE *RcsId = "$Id$";
 
 /*
  * $Log$
+ * Revision 1.9  2001/03/30 19:30:06  bartoldeman
+ * Misc fixes and implementation of SHELLHIGH. See history.txt for details.
+ *
  * Revision 1.8  2001/03/21 02:56:26  bartoldeman
  * See history.txt for changes. Bug fixes and HMA support are the main ones.
  *
@@ -75,25 +78,20 @@ static BYTE *RcsId = "$Id$";
  *
  */
 
+/* see RBIL D-2152 and D-215D06 before attempting
+   to change these two functions!
+ */
 UWORD get_machine_name(BYTE FAR * netname)
 {
-  BYTE FAR *xn;
-
-  xn = MK_FP(net_name, 0);
-  fbcopy((BYTE FAR *) netname, xn, 15);
+  fmemcpy(netname, &net_name, 15);
   return (NetBios);
-
 }
 
 VOID set_machine_name(BYTE FAR * netname, UWORD name_num)
 {
-  BYTE FAR *xn;
-
-  xn = MK_FP(net_name, 0);
   NetBios = name_num;
-  fbcopy(xn, (BYTE FAR *) netname, 15);
+  fmemcpy(&net_name, netname, 15);
   net_set_count++;
-
 }
 
 /*
@@ -161,44 +159,7 @@ COUNT Remote_find(UWORD func, BYTE FAR * name, REG dmatch FAR * dmp )
   dmp->dm_date = SDp->dir_date;
   dmp->dm_size = (LONG) SDp->dir_size;
 
-/*
-   Needed Code Rep-off.;)
- */
-/*    
-  p = dmp->dm_name;
-  if (SDp->dir_name[0] == '.')
-  {
-    for (x = 0, q = (BYTE FAR *) SDp->dir_name; x < FNAME_SIZE; x++)
-    {
-      if (*q == ' ')
-        break;
-      *p++ = *q++;
-    }
-  }
-  else
-  {
-    for (x = 0, q = (BYTE FAR *) SDp->dir_name; x < FNAME_SIZE; x++)
-    {
-      if (*q == ' ')
-        break;
-      *p++ = *q++;
-    }
-    if (SDp->dir_ext[0] != ' ')
-    {
-      *p++ = '.';
-      for (x = 0, q = (BYTE FAR *) SDp->dir_ext; x < FEXT_SIZE; x++)
-      {
-        if (*q == ' ')
-          break;
-        *p++ = *q++;
-      }
-    }
-   }
-  *p++ = NULL;
-*/    
   ConvertName83ToNameSZ((BYTE FAR *) dmp->dm_name, (BYTE FAR *) SDp->dir_name);
-
-
   return i;
 }
 
diff --git a/kernel/prf.c b/kernel/prf.c
index a64c9fe..1c04d1b 100644
--- a/kernel/prf.c
+++ b/kernel/prf.c
@@ -34,6 +34,9 @@ static BYTE *prfRcsId = "$Id$";
 
 /*
  * $Log$
+ * Revision 1.6  2001/03/30 19:30:06  bartoldeman
+ * Misc fixes and implementation of SHELLHIGH. See history.txt for details.
+ *
  * Revision 1.5  2001/03/21 02:56:26  bartoldeman
  * See history.txt for changes. Bug fixes and HMA support are the main ones.
  *
@@ -41,6 +44,9 @@ static BYTE *prfRcsId = "$Id$";
  * recoded for smaller object footprint, added main() for testing+QA
  *
  * $Log$
+ * Revision 1.6  2001/03/30 19:30:06  bartoldeman
+ * Misc fixes and implementation of SHELLHIGH. See history.txt for details.
+ *
  * Revision 1.5  2001/03/21 02:56:26  bartoldeman
  * See history.txt for changes. Bug fixes and HMA support are the main ones.
  *
@@ -348,6 +354,20 @@ do_outputstring:
   return 0;
 }
 
+void hexd(char *title,UBYTE FAR *p,COUNT numBytes)
+{
+    int loop;
+    printf("%s%04x|",title,p);
+    for (loop = 0; loop < numBytes; loop++)
+        printf("%02x ", p[loop]);
+    printf("|");
+    
+    for (loop = 0; loop < numBytes; loop++)
+        printf("%c", p[loop] < 0x20 ? '.' : p[loop]);
+    printf("\n");    
+}    
+
+
 
 #ifdef TEST
 /*
diff --git a/kernel/proto.h b/kernel/proto.h
index bf48348..590c5d7 100644
--- a/kernel/proto.h
+++ b/kernel/proto.h
@@ -34,6 +34,9 @@ static BYTE *Proto_hRcsId = "$Id$";
 
 /*
  * $Log$
+ * Revision 1.12  2001/03/30 19:30:06  bartoldeman
+ * Misc fixes and implementation of SHELLHIGH. See history.txt for details.
+ *
  * Revision 1.11  2001/03/27 20:27:43  bartoldeman
  * dsk.c (reported by Nagy Daniel), inthndlr and int25/26 fixes by Tom Ehlert.
  *
@@ -243,6 +246,8 @@ COUNT DosRename(BYTE FAR * path1, BYTE FAR * path2);
 COUNT DosMkdir(BYTE FAR * dir);
 COUNT DosRmdir(BYTE FAR * dir);
 struct dhdr FAR * IsDevice(BYTE FAR * FileName);
+/* extern sft FAR *get_free_sft(WORD FAR * sft_idx);
+   #define FcbGetFreeSft(sft_idx) get_free_sft(sft_idx) */
 
 /*dosidle.asm */
 VOID DosIdle_int(void);
@@ -269,6 +274,7 @@ COUNT dir_write(REG struct f_node FAR * fnp);
 VOID dir_close(REG struct f_node FAR * fnp);
 COUNT dos_findfirst(UCOUNT attr, BYTE FAR * name);
 COUNT dos_findnext(void);
+void ConvertName83ToNameSZ(BYTE FAR *destSZ, BYTE FAR *srcFCBName);
 
 /* fatfs.c */
 __FAR_WRAPPER(COUNT, dos_open, (BYTE FAR * path, COUNT flag))
@@ -353,6 +359,7 @@ BOOL FcbFindNext(xfcb FAR * lpXfcb);
 
 /* inithma.c */
 int MoveKernelToHMA(void);
+VOID FAR *HMAalloc(COUNT bytesToAllocate);
 
 /* initoem.c */
 UWORD init_oem(void);
@@ -375,6 +382,7 @@ VOID INRPT FAR int28_handler(void);
 VOID INRPT FAR int2a_handler(void);
 VOID INRPT FAR int2f_handler(void);
 VOID INRPT FAR empty_handler(void);
+VOID INRPT FAR int0_handler(void);
 
 /* ioctl.c */
 COUNT DosDevIOctl(iregs FAR * r, COUNT FAR * err);
@@ -454,6 +462,7 @@ UWORD syscall_MUX14(DIRECT_IREGS);
 VOID put_console(COUNT c);
 __FAR_WRAPPER(WORD, printf, (CONST BYTE * fmt,...))
 WORD sprintf(BYTE * buff, CONST BYTE * fmt,...);
+VOID hexd(char *title,VOID FAR *p,COUNT numBytes);
 
 /* strings.c */
 __FAR_WRAPPER(COUNT, strlen, (REG BYTE * s))
@@ -547,8 +556,3 @@ unsigned long FAR is_dosemu(void);
 */
 
 #define ASSERT_CONST(x) { typedef struct { char x[2 * (x) - 1]; } xx ; }
-
-void ConvertName83ToNameSZ(BYTE FAR *destSZ, BYTE FAR *srcFCBName);
-
-
-VOID FAR *HMAalloc(COUNT bytesToAllocate);
diff --git a/kernel/task.c b/kernel/task.c
index 7d68889..5440b6e 100644
--- a/kernel/task.c
+++ b/kernel/task.c
@@ -35,6 +35,9 @@ static BYTE *RcsId = "$Id$";
 
 /*
  * $Log$
+ * Revision 1.8  2001/03/30 19:30:06  bartoldeman
+ * Misc fixes and implementation of SHELLHIGH. See history.txt for details.
+ *
  * Revision 1.7  2001/03/21 02:56:26  bartoldeman
  * See history.txt for changes. Bug fixes and HMA support are the main ones.
  *
@@ -149,6 +152,8 @@ static BYTE *RcsId = "$Id$";
 #define LOAD    1
 #define OVERLAY 3
 
+#define LOAD_HIGH 0x80
+
 static exe_header header;
 
 #define CHUNK 32256
@@ -176,7 +181,7 @@ LONG doslseek(COUNT fd, LONG foffset, COUNT origin)
 LONG DosGetFsize(COUNT hndl)
 {
   sft FAR *s;
-  sfttbl FAR *sp;
+/*  sfttbl FAR *sp;*/
 
   /* Test that the handle is valid                */
   if (hndl < 0)
@@ -444,8 +449,8 @@ set_name:
 COUNT DosComLoader(BYTE FAR * namep, exec_blk FAR * exp, COUNT mode)
 {
   COUNT rc,
-    err,
-    env_size;
+    err
+    /*,env_size*/;
   COUNT nread;
   UWORD mem;
   UWORD env,
@@ -456,6 +461,11 @@ COUNT DosComLoader(BYTE FAR * namep, exec_blk FAR * exp, COUNT mode)
   iregs FAR *irp;
   LONG com_size;
 
+  int  ModeLoadHigh = mode & 0x80;
+  int  UMBstate     = uppermem_link;
+
+  mode &= 0x7f;
+
   if (mode != OVERLAY)
   {
 
@@ -470,6 +480,12 @@ COUNT DosComLoader(BYTE FAR * namep, exec_blk FAR * exp, COUNT mode)
       return rc;
     }
     com_size = asize;
+    
+    if (  ModeLoadHigh && uppermem_root)
+        {
+        DosUmbLink(1);                          /* link in UMB's */
+        }
+    
     /* Allocate our memory and pass back any errors         */
     if ((rc = DosMemAlloc((seg) com_size, mem_access_mode, (seg FAR *) & mem
                         ,(UWORD FAR *) & asize)) < 0)
@@ -500,6 +516,12 @@ COUNT DosComLoader(BYTE FAR * namep, exec_blk FAR * exp, COUNT mode)
   }
   else
     mem = exp->load.load_seg;
+    
+  if (  ModeLoadHigh && uppermem_root)
+    {
+    DosUmbLink(UMBstate);                          /* restore link state */
+    }
+    
 
   /* Now load the executable                              */
   /* If file not found - error                            */
@@ -596,7 +618,7 @@ VOID return_user(void)
     FAR * q;
   REG COUNT i;
   iregs FAR *irp;
-  long j;
+/*  long j;*/
 
   /* restore parent                                       */
   p = MK_FP(cu_psp, 0);
@@ -630,11 +652,11 @@ VOID return_user(void)
   exec_user((iregs FAR *) q->ps_stack);
 }
 
-static COUNT DosExeLoader(BYTE FAR * namep, exec_blk FAR * exp, COUNT mode)
+COUNT DosExeLoader(BYTE FAR * namep, exec_blk FAR * exp, COUNT mode)
 {
   COUNT rc,
     err,
-    env_size,
+    /*env_size,*/
     i;
   COUNT nBytesRead;
   UWORD mem,
@@ -652,6 +674,12 @@ static COUNT DosExeLoader(BYTE FAR * namep, exec_blk FAR * exp, COUNT mode)
   seg FAR *spot;
   LONG exe_size;
 
+  int  ModeLoadHigh = mode & 0x80;
+  int  UMBstate = uppermem_link;
+
+  mode &= 0x7f;
+    
+
   /* Clone the environement and create a memory arena     */
   if (mode != OVERLAY)
   {
@@ -675,7 +703,7 @@ static COUNT DosExeLoader(BYTE FAR * namep, exec_blk FAR * exp, COUNT mode)
   /* and finally add in the psp size                      */
   if (mode != OVERLAY)
     image_size += sizeof(psp);             /*TE 03/20/01*/
-
+    
   if (mode != OVERLAY)
   {
     /* Now find out how many paragraphs are available       */
@@ -704,11 +732,18 @@ static COUNT DosExeLoader(BYTE FAR * namep, exec_blk FAR * exp, COUNT mode)
        overlay (replace) the current exe file with a new one.
        Jun 11, 2000 - rbc
   } */
+
+
+  if (  ModeLoadHigh && uppermem_root)
+    {
+    DosUmbLink(1);                          /* link in UMB's */
+    }
   
   /* Allocate our memory and pass back any errors         */
   /* We can still get an error on first fit if the above  */
   /* returned size was a bet fit case                     */
-  if ((rc = DosMemAlloc((seg) exe_size, mem_access_mode, (seg FAR *) & mem
+  /* ModeLoadHigh = 80 = try high, then low                   */
+  if ((rc = DosMemAlloc((seg) exe_size, mem_access_mode | ModeLoadHigh, (seg FAR *) & mem
                         ,(UWORD FAR *) & asize)) < 0)
   {
     if (rc == DE_NOMEM)
@@ -737,6 +772,10 @@ static COUNT DosExeLoader(BYTE FAR * namep, exec_blk FAR * exp, COUNT mode)
     /* with no error, we got exactly what we asked for      */
     asize = exe_size;
 
+#ifdef DEBUG  
+    printf("loading %s at %04x\n", (char*)namep,mem);
+#endif    
+
 /* /// Added open curly brace and "else" clause.  We should not attempt
        to allocate memory if we are overlaying the current process, because
        the new process will simply re-use the block we already have allocated.
@@ -747,6 +786,12 @@ static COUNT DosExeLoader(BYTE FAR * namep, exec_blk FAR * exp, COUNT mode)
   else
     asize = exe_size;
 /* /// End of additions.  Jun 11, 2000 - rbc */
+
+  if (  ModeLoadHigh && uppermem_root)
+    {
+    DosUmbLink(UMBstate);                          /* restore link state */
+    }
+
    
   if (mode != OVERLAY)
   {
@@ -905,7 +950,7 @@ COUNT DosExec(COUNT mode, exec_blk FAR * ep, BYTE FAR * lp)
   COUNT rc,
     err;
   exec_blk leb = *ep;
-  BYTE FAR *cp;
+/*  BYTE FAR *cp;*/
   BOOL bIsCom = FALSE;
 
   /* If file not found - free ram and return error        */
@@ -918,6 +963,7 @@ COUNT DosExec(COUNT mode, exec_blk FAR * ep, BYTE FAR * lp)
     return DE_FILENOTFND;
   }
 
+
   if (DosRead(rc, sizeof(exe_header), (VOID FAR *) & header, &err)
       != sizeof(exe_header))
   {
@@ -955,6 +1001,8 @@ VOID InitPSP(VOID)
   new_psp(p, 0);
 }
 
+UBYTE P_0_startmode = 0;
+
 /* process 0       */
 VOID FAR reloc_call_p_0(VOID)
 {
@@ -979,7 +1027,8 @@ VOID FAR reloc_call_p_0(VOID)
 #ifdef DEBUG
   printf("Process 0 starting: %s\n\n", (BYTE *) szfInitialPrgm);
 #endif
-  if ((rc = DosExec(0, (exec_blk FAR *) & exb, szfInitialPrgm)) != SUCCESS)
+  if ((rc = DosExec(Config.cfgP_0_startmode,
+                    (exec_blk FAR *) & exb, szfInitialPrgm)) != SUCCESS)
     printf("\nBad or missing Command Interpreter: %d\n", rc);
   else
     printf("\nSystem shutdown complete\nReboot now.\n");