Thanks for your answers, I'll try a test program to see what speed it says.

Hello friends, I have an Intel 486 DX4 75Mhz microprocessor. This is mounted on a DataExpert EXP4045 motherboard with turbo button. My question is, what speed does the microprocessor go when the turbo is not activated? It is not clear to me if it will be the multiplier by 1 and it will be 25Mhz or …

I view upper that EXP4045_J1.zip fix 2GB limit but, I will need to buy virgin eprom and a recorder for it, what model of eprom and recorder should I buy for the bios of this board? Thank you. This board uses a 28-pin DIP 64KB EPROM. Those chips are generally named 27C512 with differing vendor …

Thank you for us replies. I I don't want to touch the original eprom on the board, that's why I want to do the external process on another eprom. What model of eprom should I buy or where can I get them?

Hi, I have got a Expertboard 4045 (with Intel 486DX4), this motherboard have a BIOS version 2.2 (Award 2.50). I have seen improved bios versions for this board, especially solving the 2GB hard drive limit and I would like to be able to try them. I guess I will need on the one hand EPROMS and on the …

P24D settings fixed half of the problem. Floppy drive works in WB mode fine as long as multiplier is 3x but stops working in 4x. Turbo button still not working in WB mode even with 3x multiplier but works fine if WT mode with both 3x and 4x multiplier. Or perhaps you could say that it is working …