Padding out the Wiebe firmware should be enough. If you look at the end of it in a hex editor you can see that it's already been padded out to 64k. Just add another 64k of Fs to it until the firmware is 128k (131072 bytes) in size and then flash with updflash from a DOS bootdisk.
I inserted the padding before the last line. I'm not exactly sure what that string at the end is for but all the SATA roms have the same value, regardless of the version. The RAID one I checked has two bytes changed so perhaps it's related to the device ID.
If only we could get a firmware from the Mathey MSATA-P02MAC. That supports OS9 booting and the eeprom is only 512k so it'll easily fit on most 3112s.
I inserted the padding before the last line. I'm not exactly sure what that string at the end is for but all the SATA roms have the same value, regardless of the version. The RAID one I checked has two bytes changed so perhaps it's related to the device ID.
If only we could get a firmware from the Mathey MSATA-P02MAC. That supports OS9 booting and the eeprom is only 512k so it'll easily fit on most 3112s.