MSDOS.SYS would normally appear immediately after IO.SYS,
but because I manually copied a particular version, it
went to the end instead.


Booting from Floppy...
Welcome to PD-Windows
warning - still using a.out format
Welcome to PCOMM
warning - failed to open AUTOEXEC.BAT

A:\]dir
IO.SYS            17882       2021-06-07 19:03:42
COMMAND.COM       71120       2021-06-07 19:05:50
KERNEL32.DLL      35328       2021-06-07 20:08:20 kernel32.dll
MSVCRT.DLL        38400       2021-06-07 20:10:30 msvcrt.dll
TERMINAL.EXE      15883       2021-06-14 15:00:04
HDTOFIL.EXE        4096       2021-06-13 15:13:58
ZFILL.EXE          3584       2021-06-25 22:31:56
HEXDUMP.EXE        3584       2021-06-13 15:11:38
PDPTEST.EXE        4608       2021-06-13 15:10:46
PORTINIT.EXE      15041       2021-06-13 15:01:54
PORTREAD.EXE      15741       2021-06-13 15:03:18
PORTWRIT.EXE      15567       2021-06-13 15:03:50
ZAP.EXE            3072       2021-06-13 15:13:18
README.TXT          133       2021-06-10 02:45:30 readme.txt
MSDOS.SYS        101024       2021-06-07 19:05:20 msdos.sys

A:\]



Boot from hard disk gives:

 . http://www.nongnu.org/vgabios

Bochs VBE Display Adapter enabled

Bochs 2.6.10.svn BIOS - build: 01/05/20
$Revision: 1.2 $ $Date: 2021/06/26 08:12:04 $
Options: apmbios pcibios pnpbios eltorito rombios32

ata0 master: Generic 1234 ATA-6 Hard-Disk ( 999 MBytes)
ata0  slave: Generic 1234 ATA-6 Hard-Disk (  34 MBytes)
ata1 master: Generic 1234 ATA-6 Hard-Disk ( 885 MBytes)

Press F12 for boot menu.

Booting from Hard Disk...
Welcome to PDOS/386 (aka PD-Windows)
warning - still using a.out format
Welcome to PCOMM
Divide by zero fault occurred (Protected Mode Exception 0x0)
EAX 000000B0 EBX 000000B0 ECX 00000000 EDX 00000000
ESI 00000002 EDI 00000080
module loaded at 00400000, entry point 00400000
regs are at E0011F50
old stack starts at 00453F28


(note that the addresses are crap, and the display is cut
short, because VM is enabled. I have attempted to comment
out the VM code, and it works to some extent, but is less
stable and needs to be debugged).



C:\devel\pdos\pdpclib>dir *.h
 Volume in drive C is OS
 Volume Serial Number is 500F-DBAC

 Directory of C:\devel\pdos\pdpclib

2019-06-13  18:09             1,052 assert.h
2020-03-23  20:24             1,855 ctype.h
2020-03-23  20:34               956 errno.h
2021-03-15  19:52             3,678 float.h
2019-05-01  14:53             3,134 liballoc.h
2021-04-04  06:35             1,773 limits.h
2017-11-23  19:05             1,594 locale.h
2021-05-02  12:13             2,693 math.h
2020-11-13  07:18             1,288 mvssupa.h
2021-03-14  01:22             1,851 setjmp.h
2021-04-11  14:55             1,362 signal.h
2019-07-04  09:58             1,892 stdarg.h
2021-04-05  07:51             1,639 stddef.h
2021-04-30  02:12             9,845 stdio.h
2021-03-15  20:01             3,498 stdlib.h
2021-03-15  19:51             6,515 string.h
2021-03-15  20:02             1,986 time.h
2017-11-23  19:05             4,994 __memmgr.h
              18 File(s)         51,605 bytes
               0 Dir(s)  75,360,010,240 bytes free

C:\devel\pdos\pdpclib>grep -i public stdio.c string.c stdlib.c
stdio.c:/*  Released to the Public Domain                                    */
stdio.c:/*  Modifications by Dave Edwards, released to the Public Domain     */
stdio.c: It is however placed in the Public Domain so that any one
string.c:/*  Released to the Public Domain                                    */
stdlib.c:/*  Released to the Public Domain                                    */
stdlib.c:/* This qsort routine was obtained from libnix (also public domain),
stdlib.c:   public domain */

C:\devel\pdos\pdpclib>