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Booting FreeDOS from an MS-DOS v7 compatible IO.SYS (Users)

posted by ecm Homepage E-mail, Düsseldorf, Germany, 04.01.2023, 14:11

I figured you may be interested in using my boot stages to create a FreeDOS kernel file that can be loaded as a compatible replacement for IO.SYS for MS-DOS v7. (Or, MS-DOS v6 IO.SYS as well, in fact.)

The following log is as run on a machine with a recent Mercurial (hg), wget, Info-Zip unzip, and nasm installed. The quote marks for string defines are written in the way that bash expects them. (That is, use both double and single quotes so as to pass one pair of quotes to the assembler.)

I also uploaded the resulting directory (including all sources, GPL-compliant) to https://pushbx.org/ecm/test/20230104/

The fdkernel.zip file downloaded at the beginning is my automatic build of the latest FreeDOS kernel sources, using tkchia's gcc-ia16 that targets 8086 machines. You can use tom's special kernel.sys instead for an otherwise identical build, but I will not host it without sources.

$ wget https://pushbx.org/ecm/download/fdkernel.zip -q
$ unzip -j fdkernel.zip bin/kernel.sys
Archive:  fdkernel.zip
  inflating: kernel.sys             
$ hg clone https://hg.pushbx.org/ecm/lmacros
destination directory: lmacros
requesting all changes
adding changesets
adding manifests
adding file changes
added 153 changesets with 183 changes to 40 files
new changesets 3a982025dd94:99b01fa65007
updating to branch default
31 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg clone https://hg.pushbx.org/ecm/ldosboot
destination directory: ldosboot
requesting all changes
adding changesets
adding manifests
adding file changes
added 671 changesets with 755 changes to 16 files (+2 heads)
new changesets 13cf6bb0b5f5:53d3efebfa44
updating to branch default
16 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg clone https://hg.pushbx.org/ecm/scanptab
destination directory: scanptab
requesting all changes
adding changesets
adding manifests
adding file changes
added 10 changesets with 10 changes to 1 files
new changesets ec30db08fa90:0e53081c1531
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd ldosboot
$ nasm fdkernpl.asm -I ../lmacros/ -D_PAYLOAD_FILE="'../kernel.sys'" -o fdkernpl.bin
$ nasm iniload.asm -I ../lmacros/ -I ../scanptab/ -D_PAYLOAD_FILE="'fdkernpl.bin'" -D_INILOAD_SIGNATURE="'FD'" -o ../io.sys
iniload.asm:813: warning: 1 bytes in front of ms7_entry [-w+user]
iniload.asm:1212: warning: 1 bytes in front of ldos_entry [-w+user]
iniload.asm:1613: warning: 1 bytes in front of end [-w+user]
iniload.asm:1687: warning: 427 bytes in front of end2 [-w+user]
$

---
l

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