Picture of a Revision A version

Picture of a Revision B-3 version

Hi Res Version of Rev A (1262 x 806)
Hi Res Version of Rev B-3 (1218 x 797)

1MB RAM expansion which fits into the trapdoor slot of the A600. The card also has a real time battery backed up a clock. The cards appear to have a switch to allow the disabling of the card.

Thanks to Takahasi Kasiko