Solve : editing dos when no hard drive is used?

1.	Solve : editing dos when no hard drive is used?
Answer» I am running a GAME that is dos based. No hard drive. Only a cdrom used.Dos 6.2. The boot info is on the cd. I need to EDIT something in the config.sys but cant get to it. At dos promt, is says its located in a:\ dir. cd is located in c:\. I assume the a: is the ram drive and the info is located on the ram. when I try a:\ edit config.sys, I get invalid drive in search path. When I try a:\ dir, I can see all the dos filesConfig.sys is only used once, immediately after startup, to setup DOS.Any changes you make to a file in a RAM drive will be lost after you reboot. ANYHOW, the config.sys file being used is on the CD-ROM, which as you will know, is read-only. thanks for that info. So i guess I should back up. This UNIT worked fine until battery died and lost cmos settings. now when boot up I get "unable to set page frame address--EMS unavailable" Emm386 loaded extended memory service unavailable emm386 active access denied extended error 65

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