copy A:\OKRU.SYS C:\OKRU\ copy A:\OKRU.EXE C:\OKRU\BIN\ Repeat for Disk 2 and 3, copying all .SYS and .OVL files into C:\OKRU\ . This is the sensitive part. The NAISENKAARI_97.BIN file is a self-extracting archive but not for Windows. Run:
DEVICE=C:\DOS\HIMEM.SYS DEVICE=C:\DOS\EMM386.EXE NOEMS I=B000-B7FF DEVICE=C:\OKRU\OKRU.SYS /IRQ=5 /DMA=1 /PORT=300 DEVICE=C:\NAISENKAARI\NK_SERVO.SYS FILES=40 BUFFERS=30 LASTDRIVE=Z The /IRQ=5 must match your Naisenkaari card's jumper setting. naisenkaari 1997 okru install
OKRU Kernel v2.1b (c) 1997 – OKRU Systems Loading Naisenkaari servo controller... OK IRQ 5 acquired. DMA channel 1 assigned. NK97 driver ready. If you see this, the has succeeded. Part 4: Troubleshooting Common Errors Despite following the guide, you may encounter issues. Here are the top three failures and fixes. Error 1: "NK_SERVO.SYS not found – IRQ conflict" Cause: Another device (sound card, network card) is using IRQ 5. Fix: Remove all non-essential ISA cards. In BIOS, reserve IRQ 5 for "Legacy ISA." Error 2: "OKRU Kernel Panic: DMA overrun" Cause: Your hard drive is too fast or the DMA channel is wrong. Fix: In CONFIG.SYS , change /DMA=1 to /DMA=3 . Also enable "IDE PIO Mode 0" in BIOS to slow down storage. Error 3: "Invalid Naisenkaari signature – year mismatch" Cause: The 1997 driver checks the system CMOS date. Fix: Boot into BIOS and set the system date to December 15, 1997 . The driver has a hardcoded certificate check that expires after March 1998. Part 5: Alternative – Emulating the Naisenkaari 1997 OKRU Install If you cannot find 1997 hardware, consider emulation. copy A:\OKRU