I've been given three Apple II scsi cards...two Rev C and one High Speed. The problem is that none of them work. The system or scsi card test disk do not see them, in any slot of multiple IIGS cpus, and a known good hard drive with system 6.01 is likewise not seen when hooked to them. Does anyone have an idea of how to do any diagnostics on these or whether its feasable or economical to repair them?