Hi,
i was struggling with Adaptec ASR-2120S 1961800 at least my card is PCI-X, but works in PCI slots too (with crippled bandwith), its nice card with 64 MB on board cache. I had problem, it not worked with Windows 7 32 bit, with original firmware b6011, but tried a luck and upgrade to newest build B8208 (its also use / reports different version - 4.2, my original was 4.0 ) and its now working - well at driver is loaded fine, before it was code 10 in Windows 7 32bit, with now firmware its fine. There some 64bit drivers too, but only XP 64bit and server 2003 are officially mentioned. For Windows 7 32 bit my drivers cards to be 22.11.2011, version 5.2.0.18668 i got trough SDI origin, or other drivers installer.
It was PITA to find last firmware so its better to archive it, here, flash command and utility is bundled.
The attachment Adaptec-2120S-last-Firmware-B8208.zip is no longer available
If someone know how to make it working in DOS or Windows 98 let me know, i had not time yet to look it to it.. There are NT4, Windows 2000 a XP official drivers, but Windows 9x is ommited.. there is something about Dos in manual, at least for diagnostic and RAID creation.. Also maybe, maybe DOS driver if exist could actually work for Win 9x too..
Im old goal oriented goatman, i care about facts and freedom, not about egos+prejudices. Hoarding=sickness. If you want respect, gain it by your behavior. I hate stupid SW limits, SW=virtual world, everything should be possible if you have enough raw HW.