First post, by Osmodia
Hi guys,
I just got my hands on the 4DPS Tomatoboard, Rev2.11. I have a issue with my DX4-100 (SK051). Its recognized correctly as DX4-S, but when booting from HDD, I get an error "Himem.sys has detected unreliable xms memory at address xxxxxxxxx". If I press Enter so the system can boot, it mostly hangs at some point or it displays Read Errors. I never get to the prompt.
All the jumpers are correct, for DX4 WT. I even tried almost every BIOS which I could find. Originally 1.7 was flashed, then I tried 4.00, 5.00 and now I am at 1.72f, which seems to be the most reliable as I read somewhere here.
Also I tried to jumper the CPU for DX4-WB but boots and has the same issues as above. The L2 Cache Tag Bits were adjusted in both ways, no difference.
If I disable the internal Cache, the system boots up fine and no erros or anything else appear. The CPU is still working flawlessly in my UM8810PAIO Board, so the CPU can't be dead or faulty, also the HDD comes from this system. With Cache enabled, I also cannot boot from FDD, I always get an error "replace system disk". Although it is a genuine MS-DOS Disk, which works in other systems.
With a DX-2 66, I can activate the internal Cache and it boots up with no errors.
Strange is, when powered up cold, it needs to bee rebooted once so it can post. It turned on, the screen stays blank and the system doesn't boot up.
Also, the external Cache (512k) only gets recognized as 256KB, no matter how I jumper the external Cache.
Can someone help me? Thanks.