Something similar might be just setting up some virtual machines in a VM program like VirtualBox. You're on your own with regards to getting properly licensed copies of the operating systems you need to use. There's always FreeDOS for DOS type functions, but I can't help with Win9x.
Another option would be to check sites like Freecycle and Craigslist for people in your area who might be looking to offload some really old machines. Then you have one workstation dedicated to DOS stuff, one for Win9x, and a third for everything else.
In my job I have to program on site several sorts of equipment but some equipment can only be programmed with Windows 7 And Windows Vista some software will only run on windows XP this is not a problem as I run windows 7 ultimate so I have got XP mode my main problem is that some of the Hardware will only run in dos or windows 95 and Windows 98 I am looking fof somthing like windows 98 mode to run from windows virtual machine on windows 7

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic