Forgot: as can be seen above, I was playing with Write Back and Write Through. Speedsys 4.78 above shows the WT results. With WB the outcome for Speedsys is slightly higher. In the Excel overview different outcomes show and not all results are higher for WB. Speedsys for WB IMG_7822.JPG After …

Continued: Test setup: I used an ATX power supply with the ATX-to-AT connector, a CF card for DOS 6.22 and benchmark programs, the AT-to-PS2 Keyboard adapter and a passive heatsink on the AMD486DX2-80. 31C5B7EC-941B-4338-B083-3BBD3B17A023.JPG VOGONS has an awesome collection of benchmark programs. A …

Continued: The I/O board used for the benchmarks. It's an UMC card with UM82C863F/UM82C865F and branded MIO-VL P103. 1026BA9A-4E98-4178-A596-0AB1CFEB500C.JPG The Crystal CX4235-XQ3 that also ended up on the new board. I was unable to get it working in pure DOS. No issues with WIN95. D09A8F29-54D5- …

The 486 was extremely dusty. I did not take any pictures when it came in. I bought it because I needed the VLB video card, controller card and audio for another board. After I found this post, I played with the MB for a while, trying out some combinations of RAM, CPU and cards. In the end I put it …

Gerwin, you are a life saver! Last week I scored an 486 system on Ebay. The motherboard simply stated MB456V1.1 which gave no google results. Then I searched the UMC chip set and hit the jackpot with this post. Your package for TK8498F motherboard and VGA+Multi-I/O gave me all the info I was looking …