Issues

• INT 21h/4400h leaks driver attributes into DOS-reserved device-data bits

  FDOS/kernel#268 · Filter by author nakatamaho opened on Sep 24, 2026

• INT 21h/4401h should report invalid function for nonzero DH

  FDOS/kernel#266 · Filter by author nakatamaho opened on Sep 23, 2026

• INT 21h/440Bh should reject when SHARE is not loaded

  FDOS/kernel#265 · Filter by author nakatamaho opened on Sep 23, 2026

• INT 21h/4409h and 440Ah skip documented redirector dependency

  FDOS/kernel#264 · Filter by author nakatamaho opened on Sep 23, 2026
  1

• INT 21h/440Dh invalid minor should report invalid function

  FDOS/kernel#263 · Filter by author nakatamaho opened on Sep 23, 2026

• INT 21h/AH=65h reports invalid function for an unavailable country/code-page pair

  bugcompatibility
  FDOS/kernel#262 · Filter by author nakatamaho opened on Sep 23, 2026

• DosForceDup (INT 21h/AH=46h) does not validate NewHandle: out-of-bounds JFT access + dup2(h,h) closes the handle

  FDOS/kernel#261 · Filter by author geraldo-netto opened on Jul 31, 2026

• Volkov Commander crashes

  FDOS/kernel#260 · Filter by author PerditionC opened on Jul 5, 2026
  1

• Release package for 2046 Package has a long file name (LFN)

  bugcompatibility
  FDOS/kernel#258 · Filter by author sparky4 opened on Jun 30, 2026
  5

• Invisible Lan fredir.exe fails control-break lookup

  bug
  FDOS/kernel#255 · Filter by author PerditionC opened on Jun 18, 2026
  7

• ErrorMode should be cleared after re-incrementing InDOS, not before

  bugcompatibility
  Bug

  FDOS/kernel#251 · Filter by author ecm-pushbx opened on May 4, 2026

• config.c umb_init expects to be and is called only once

  compatibility
  FDOS/kernel#250 · Filter by author ecm-pushbx opened on Apr 28, 2026

• critical error findfirst not handled correctly

  bug
  FDOS/kernel#247 · Filter by author PerditionC opened on Apr 23, 2026
  6

• SYS: /B 00 not correctly accepted to enter a zero into boot unit variable

  FDOS/kernel#239 · Filter by author ecm-pushbx opened on Apr 2, 2026

• XHDD.SYS failure

  FDOS/kernel#237 · Filter by author ZX-Commodore-ST opened on Feb 21, 2026

• Regression on EOF on stdin

  FDOS/kernel#236 · Filter by author andrewbird opened on Feb 17, 2026
  22

• INT21,7305 only invalidates buffers on success

  FDOS/kernel#234 · Filter by author boeckmann opened on Jan 25, 2026

• FAT32 C: boot on 16-bit PC systems

  bugcompatibilityenhancement
  Feature

  FDOS/kernel#223 · Filter by author sparky4 opened on Oct 9, 2025
  23

• MS-DOS writes 0 bytes if an entire write cannot be fulfilled due to disk space

  compatibility
  FDOS/kernel#218 · Filter by author ecm-pushbx opened on Sep 20, 2025
  4

• Build all kernel variants via Github actions

  todo
  FDOS/kernel#216 · Filter by author boeckmann opened on Aug 29, 2025

• Busy SFT (during open) has a reference count of 0FFFFh on MS-DOS, lDOS, EDR-DOS

  compatibility
  FDOS/kernel#214 · Filter by author ecm-pushbx opened on Aug 21, 2025

• GCC Makefile defines march=i80286 for 386 build?

  question
  FDOS/kernel#211 · Filter by author boeckmann opened on Aug 14, 2025

• Init disk only follows one extended partition, even if both type 5 and type 15 present

  FDOS/kernel#209 · Filter by author ecm-pushbx opened on Aug 8, 2025
  9

• MCB corruption from mismatch in maximum size allocated for and read from flat-format .COM executable

  bug
  FDOS/kernel#207 · Filter by author ecm-pushbx opened on Jun 3, 2025
  12

• DaysSinceEpoch

  bug
  FDOS/kernel#206 · Filter by author adoxa opened on May 20, 2025