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21.30, 21.4452: add version info for DR-DOS v9 #106

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shidel merged 1 commit into from
May 15, 2026
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21.30, 21.4452: add version info for DR-DOS v9 #106

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4 changes: 3 additions & 1 deletion source/Interrupt List/INT 21 DOS Function Calls/INT 2130 DOS 2 GET DOS VERSION.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,8 @@ Notes: the OS/2 v1.x Compatibility Box returns major version 0Ah (10)
version y.
Enhanced DR-DOS as of v7.01.07 returns DR-DOS (OEM EEh) v6.00 here,
but v7.01 on the MS-DOS v5+ function INT 21/AX=3306h"DOS".
DR DOS v9 (rev 648) returns DR-DOS (OEM EEh) v3.31 here and does not
support the MS-DOS v5+ function INT 21/AX=3306h"DOS".
RxDOS v7.24 returns v7.24 on INT 21/AX=3306h"DOS" and either v7.10 (if
FAT32 supported), v7.00 (if FAT32 not supported but LFN supported),
or v6.22 (if both FAT32 and LFN not supported) on AH=30h.
Expand Down Expand Up @@ -166,7 +168,7 @@ Values for DOS OEM number:
DCh - Apparently used for DOS-C kernel (historically the base of the
FreeDOS kernel) for some alternative builds.
EDh - reserved for future OpenDOS/DR-DOS based projects http://www.drdos.org
EEh DR DOS (used for Enhanced DR-DOS since v7.01.07)
EEh DR DOS (used for Enhanced DR-DOS since v7.01.07 and for DR DOS v9)
EFh Novell DOS
Note: released versions of Novell DOS 7 use OEM ID 00h instead
FDh FreeDOS http://www.freedos.org/
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3 changes: 2 additions & 1 deletion .../INT 21 DOS Function Calls/INT 214452 DR DOS 341 DETERMINE DOS TYPEGET DR DOS VERSION.txt
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Expand Up @@ -105,7 +105,7 @@ Values for Digital Research operating system version ID:
63h DR DOS 3.41
64h DR DOS 3.42
65h DR DOS 5.0
67h DR DOS 6.0
67h DR DOS 6.0 (also used by DR DOS v9 rev 648)
70h PalmDOS
71h DR DOS 6.0 March 1993 "business update"
72h Novell DOS 7.0
Expand Down Expand Up @@ -224,6 +224,7 @@ Values for Digital Research operating system ID codes (full AX return value):
The listed patches only address a single problem, while the
listed updates are full rebuilds, also including all previous
fixes.
- DR DOS v9 rev 648 as of 2026-05-12
1070h - multitasking "Vladivar" kernel architecture and introduction of
DOS-like structures (1991-07-26, 08/1991)
- DR DOS ??? (1991-09-26)
Expand Down