Okay, I don't need MS-DOS 6.2 anymore since I found out that the best MS-DOS version was in Win98SE. So now am trying to build a MS-DOS 7.0 bootable CD & installation - BUT for games, not generic.
Here's what I found...
In Win98 \WINDOWS\COMMAND\EBD folder contains the Emergency Boot Disk (without the msdos.sys & ebd.sys files for some reason). I extracted the 1.44MB bootable image from the Win98 CD-ROM just to do complete. This is only an Emergency Boot Disk and not tweaked for games. However it's got a good selectable menu system.
In the Win98 \WINDOWS\ there are two files called:
MS-DOS Mode for Games.pif (XMS loading for games)
MS-DOS Mode for Games with EMS and XMS Support.pif (emm386 emulates EMS in XMS)
When double-click either files, they temporarily swap C:\autoexec.bat & C:\config.sys with optimized versions of autoexec.bat & config.sys for games. Why two different pairs of files? Some games were fussy whether emm386 was loaded and other games didn't like it.
So this is a very good idea to embed the differences in the EBD autoexec.bat & config.sys, since there's a choice menu system already programmed in the EBD autoexec & config.
Just needed to copy emm386.exe from C:\WINDOWS\ & also mscdex.exe (from ebd.cab). I also changed RAMDrive to load 16MB (instead of 2MB). Tested CD and it boots perfectly, so user can boot a PC with no harddisk and still run programs that require writing to disk. If the user has a DOS sound card then he can add the drivers to autoexec & config files.
What I want to know is how to install this MS-DOS into a blank C:\ ? Does msdos.sys & io.sys files have to be in the first sector/cluster of the HD? I don't think copying the files directly onto the HD would work?