The 3 Indy graphics options, and the dual head gfx board. XL8
The XL-8, also known as Newport graphics, is the same board as the XL-24 board, but with fewer bitplanes. The PC board is the same, but they are missing a number of ICs, most notably (on the top side of the board) 4 RAM chips.

Also note the GIO-32 connectors near the bottom of the board. This is where options are attached, such as the Indy video board and Cosmo Compress option.

XL24
The XL-24 board, has all chip positions filled.

XZ
XZ is a 2 board set, here is a picture of the top board (the one visible when you open the case top)

Dual Head 8 bit graphics board

The (somewhat rare) dual head graphics option board for Indy. This is an 8 bit model, there is also a 24 bit model. This board sits on top of the motherboard. A regular 8 or 24 bit XL board then sits on top of the dual head gfx option board.

More pictures of dual head board:
Bottom of board
Side by side with 8 bit XL board
Another side by side with XL-8

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