v081nhdb@ubvmsd.cc.buffalo.edu (Nina Banerjee) (08/06/90)
It's no problem replacing an 8088 with a V20. But, you can't make the V20 run at 8MHz unless you have an 8 Mhz motherboard.. Unless your motherboard has turbo, the V20 will run at 4.77MHz. Boards that run at 8MHz have two crystals, one running at a little over 14 Mhz for the 4.77MHz CPU clock, and one at 24.000 MHz for the 8 Mhz clock. An 8 Mhz V20 is rated to run at up to 8 MHz, it cannot run faster than the clock speed. As for the RAM speed, in an XT, for 4.77Mhz you need 200ns RAM, 8 MHz needs 150ns RAM, and 10 MHz needs 120ns RAM, since an XT has one wait state. Nina Banerjee