To Write Operation System,we can use the develope software package,such as ls,djgpp,nasm,etc.The package is a good package.

Packet : 777217djgpp-gcc322-27oct2004.zip filelist
all4116.zip
bnu215b.zip
csdpmi5b.zip
dif281b.zip
djdev204.zip
fil41b.zip
gcc322b.zip
install.bat
mak380b.zip
nasm-0.98.38-djgpp.zip
nasm-0.98.38-win32.zip
pat254b.zip
readme.txt
seal107.zip
seal107p.zip
unz551x3.exe
unz551xN.exe
upx125d.zip
upx125w.zip
zvg_pat.zip
zvg_sdk11a.zip

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