I would chose the other 512K board with the Dove Mac Snap SCSI card. That is a 512Ke configuration since the Dove board requires the 128K ROMs. As I said before, a RAM disk could still be used for disk caching by the software, and not give a true picture. Then if that works, try it with System 4.1, though I've not heard of any TCP software that didn't require a minimum of System 6, and if that works, then 64K ROMs.