2026-11-01

• Question on how multiple LFN Find providers handle concurrent usages of find handle numbers, which may clash because the find handle number space is shared for all of them. (A Find Next or Find Close call doesn't get any information on which drive the handle was generated.)
• LFN Extended Open/Create on mfs drives calls down to DOS's SFN Extended Open/Create. This is a problem on MS-DOS v3 because the SFN call doesn't exist on these versions.

• A Pull Request to fix int 2Fh function 1261h, which should not return NC, AX unchanged. lDOS programs call with CY and check that the return is either CY or AX any of FFFFh, 0, or 1. If so it is detected as unsupported. (This function call is used to find the segment address of the first UMCB, and is supported by PTS-DOS and lDOS.)
• Tested a patch that is needed if country.sys is loaded in fdconfig.sys (eg: country=49,858,C:\country.sys) and a program attempts to get and call the case map function. It would return 0:0 instead of the intended far address.

First I created a UDF file system like so:

• sudo apt install udftools
• dd if=/dev/zero of=udfpart.img bs=1024 count=$((1024 * 128))
• /sbin/mkfs.udf -m hd --blocksize=2048 --bootarea=mbr udfpart.img
• dosemu -I "disk { hdimage udfpart.img }"
• In DOS: winudf /nocd

I created the following new tickets:

• Ticket #7 IISP header detection is too strict
• Ticket #8 closing process handles needn't check for open handles
• Ticket #9 LFN Extended Open/Create calls SFN Extended Open/Create which doesn't exist on MS-DOS v3
• Ticket #10 Limited amount of SFT extended file seek structures, and the structure doesn't deal well with SFT relocation, better to keep track of internal tables indexed by a field in the SFT.
• Ticket #11 negative seek offset not allowed in function 7142h, Enhanced DR-DOS and dosemu2 do allow it.
• Ticket #12 LFN Extended Open/Create problems with MS-DOS v3, unneeded masking of parameters, and incorrect masking of DL so create new file isn't allowed.

• Update dokuwiki server (ETA: partially done)
• Port lDOS command.com to NASM + WarpLink, add XMS swap, fix running in free memory, add LOADFIX and LOADHIGH commands, add LFN support.
• Add FAT32 support to lDOS kernel and selected utilities (fastopen/fastseek, sharer, format).
• Make lDOS format usable.
• Make Einsicht (Insight frontend for an lDebug debugger) usable.
• Improve Public Domain ZModem reverse engineering to make it usable.
• Adapt symscr/process.pl to handle WarpLink extended map files.
• Adapt ident86/insbound.py to emit symbolic lDebug symbol list files from dynamic labels.
• Make symbolic lDebug usable with debugger and kernel symbols, requiring to relocate symbols based on base symbols upon running code that relocates memory corresponding to a base symbol.
  • lDebug: Initial relocation of init, relocation of CODE1 and CODE2, with /T switch relocation of the entire debugger process.
  • lDOS: Relocation of init and early DOSDATA, DOSCODE, eventual relocation of DOSCODE, DOSDATA, and IRQSCODE.
  • lDOS TSRs: Relocation of the entire process, relocation of resident to install location.
  • lDOS boot: Relocation of FreeDOS-compatible loader in boot.asm and boot32.asm, or relocation of iniload if it was loaded too high to completely load the kernel payload.