First post, by OSkar000
I have been trying to upgrade one of my 486 machines to a Pentium OverDrive 83 and doesn't go so well.
Installing the CPU and setting the jumpers correctly, no problem
Booting from one of the IDE harddrive, no problem
Running Quake at 18 fps, no problem!
Running Speedsys and other benchmarks, no problem
Booting with IDE and SCSI harddrives connected, hangs on boot after the boot menu from NT 3.51 when trying to start DOS or NT
Booting from floppy, hangs at first try
Reading floppy disks... hangs after a while
All jumpers are set according to the manual.
I have tried different settings for memory timings and cache. No difference, but its damn fast with everything set as tightly as possible.. and stable, except from when reading floppys
Tried two different floppy controllers with the same result. One ISA (scsi-card) and one VLB (ide/io-controller.
It boots fine from floppy when no hard drives are connected. But as soon as I introduce another device in the system it hangs on boot. So only IDE, SCSI or floppy works fine.
I put the old CPU back, a DX4/120 and everything works as it should... Boots from floppy with all hard drives connected without issues.
I have not tried to find a newer BIOS for it. That might solve the problem...
My very well organized desk 😀