BIOS Tweak software

Once upon a time, in the days or yore, when I had a overpowered 486, I had this bit of DOS software that allowed you to tweak bios settings that the standard bios menu wouldn't allow you to tweak. Now 5 years later when I'm tinkering around with an old PC in my spare time, I'd like to have such a piece of software so I can fiddle around with the memory timings. Unfortunately the only downloadable software I can find is intended for use with new mainboards and chipsets. This old PC has an Intel S82425, EX chipset (486) and a Phoenix BIOS circa 1996. Does anyone have a piece of tweak software to suit? if so send me a link, or the package itself.