PCjs Machines
Home of the original IBM PC emulator for browsers.
OS/2 1.0 Debugger Boot Disk
This disk contained a version of OS/2 1.0 built on October 12, 1988, which included the built-in kernel debugger used by Microsoft and IBM for internal development, along with a rudimentary program selector.
Note that IBM OS/2 1.0 was finalized in October 1987, nearly a year before the timestamps of these files, indicating that this was a private build of IBM OS/2 1.0. When this disk boots, the following version banner is displayed:
IBM Operating System/2 Version 1.00
(C) Copyright IBM Corp. 1981, 1987. All rights reserved.
(C) Copyright Microsoft Corp. 1981, 1987.
88286
The 5-digit number indicates the day the files were built. The first 2 digits (88) are the year and the 3 remaining digits (286) are the day of the year (October 12).
A directory listing of this disk is provided below.
[PCjs Machine "ibm5170"]
Waiting for machine "ibm5170" to load....
Directory of OS/2 1.0 Debugger (1988)
Volume in drive A has no label
Directory of A:\
IBMBIO COM 4096 10-12-88 12:32p
IBMDOS COM 299143 10-12-88 10:53a
IBMDOS SYM 62788 10-12-88 10:54a
OSO001 MSG 64808 10-12-88 10:07a
CMD EXE 57648 10-12-88 12:52p
COMMAND COM 25564 10-12-88 12:54p
COUNTRY SYS 14632 10-12-88 1:14p
MSG DLL 6578 10-12-88 1:17p
NLS DLL 5162 10-12-88 1:18p
SWAPPER EXE 4150 10-12-88 1:43p
ANSICALL DLL 3637 10-12-88 10:07a
BKSCALLS DLL 5704 10-12-88 10:09a
BMSCALLS DLL 2576 10-12-88 10:56a
BVSCALLS OLD 31744 10-12-88 11:01a
DOSCALL1 DLL 8709 10-12-88 10:56a
KBDCALLS DLL 7232 10-12-88 11:03a
MONCALLS DLL 7351 10-12-88 11:03a
MOUCALLS DLL 5701 10-12-88 11:04a
QUECALLS DLL 11238 10-12-88 11:05a
SESMGR DLL 24278 10-12-88 11:14a
SHELL EXE 11744 10-12-88 11:15a
VIOCALLS DLL 13981 10-12-88 11:18a
CLOCK01 SYS 2812 10-12-88 11:18a
DISK01 SYS 18616 10-12-88 11:22a
EGA SYS 2110 10-12-88 11:24a
KBD01 SYS 16945 10-12-88 11:28a
PRINT01 SYS 7683 10-12-88 12:09p
SCREEN01 SYS 1583 10-12-88 12:11p
COM01 SYS 8758 10-12-88 11:19a
EXTDSKDD SYS 1877 10-12-88 11:24a
POINTDD SYS 5886 10-12-88 12:08p
VDISK SYS 4662 10-12-88 12:12p
BVSCALLS DLL 23542 1-30-89 11:07a
HARDERR EXE 16288 10-12-88 11:14a
CONFIG SYS 132 1-30-89 10:39a
BVSCALLS SYM 1636 1-30-89 11:07a
36 file(s) 790994 bytes
412160 bytes free
Aside from the fact that the IBMDOS.COM on this disk is much larger than the 1987 version (thanks to the inclusion of the kernel debugger), most of the other file sizes are identical. But not all. For example, the 1987 version of CLOCK01.SYS is 2762 bytes, whereas this version is 2812 bytes. So apparently a few changes were slipped into the 1.0 sources used to build these binaries.