Daystar RAM PowerCard. I'm pretty sure it was not addressable as system memory, just as RAM disk, print spool, and disk cache.
FWIW I have been searching for this and any similar NUBUS RAM card (e.g. National Semi 8/16; I hear rumors of an Intel one) which is required for the Symbolics MacIvory 1 and 2. Symbolics sold them with the NS8/16 boards. I have been hoping to experimentally determine whether any NUBUS memory board may be used, as the 8/16 boards get older and more failure prone (to say nothing of more difficult to find).
FWIW I have been searching for this and any similar NUBUS RAM card (e.g. National Semi 8/16; I hear rumors of an Intel one) which is required for the Symbolics MacIvory 1 and 2. Symbolics sold them with the NS8/16 boards. I have been hoping to experimentally determine whether any NUBUS memory board may be used, as the 8/16 boards get older and more failure prone (to say nothing of more difficult to find).