Original Apple 512KB VRAM module for the Macintosh LC, LC II and LC 475. Four of these can also be added to the Power Macintosh 8100 PDS video card.
This is the maximum video memory on the LC and LC II (there is no build in VRAM) and offers support for display resolutions of 512x384 at 16-bit colour and 640x480 at 8-bit colour. As standard the LC and LCII came with a 256KB VRAM module installed which offered display resolutions of 512x384 with 8-bit colour or 640x480 with 4-bit colour.

The Macintosh LC III (and Performa equivalents) has 512KB of VRAM built onto the logic board plus a single VRAM slot but supports a maximum of 768KB VRAM and so will not recognise this module. The smaller 256KB module should be added to upgrade age VRAM.

The Macintosh LC 475 (and Performa equivalents) has two VRAM slots and no built-in VRAM. It came as standard with two x 256KB modules offering support for display resolutions of 512x384 at 16-bit colour, 640x480 and 832x642 at 8-bit colour and 1024x768 and 1152x870 at 4-bit colour. The VRAM could be upgraded to 1MB by replacing the two 256K modules with two of these 512KB modules to offer display resolutions of 832x624 at 16-bit colour and 1024x768 and 1152x870 at 8-bit colour