First post, by 9646gt
I'm trying to build a 486 machine with the following:
32mb of RAM 72pin
DX4ODPR100 100Mhz 5v compatible overdrive CPU
256k of cache consisting of 4x KM68257BP-20 in first bank and 4x IS61C256AH-15N in second bank with TAG being UMC UM61M256K-15
ATI Graphics Ultra VLB upgraded from 1mb to 2mb of RAM
And on the Soyo board am using a ISA I/O card ( GoldStar Prime 2)
First motherboard: Micronics JX30WB VL-BUS (09-00192-xx) (sold as Gateway OEM pull from 4dx/33v model)
Everything boots to post screen. However the screen redraw in the bios setup is a slow one but one line refresh kind of like you'd see when redrawing a window in Windows without proper hardware acceleration. Having the HDD connected (onboard IDE controller as this board includes one) and trying to configure it in BIOS either as a custom model by entering the drive specs or using auto detect results in a hard system freeze. Even with the HDD disconnected it will freeze after the memory test completes. CPU jumpers are setup as a486DX2 66mhz as they should be for a ODPR overdrive.
Second motherboard: Soyo 025L
This board I get no display at all and no beeps. CPU is cold to the touch and jumpers (confusing on this board) are configured for 486 DX2 66MHz. I am using the GoldStar ISA I/O card I mentioned earlier in this board since it lacks a controller.
Neither board has any signs of damage and neither has ever had a Varta type battery installed so that can be eliminated as well. Both board were sold as used and working. The slow screen redraw and freezes with the firs motherboard are odd and I have NEVER seen a slow screen refresh like that in BIOS on any board at all. Any guidance moving forward?