Apple High Resolution Display Video Card

Apple High Resolution Display Video Card is a basic, unaccelerated NuBus video card released in the late 80s.

The card is capable of displaying 640x480 video in 16 colours (4-bit) using 256 KB of video RAM and can be expanded to 256 colours (8-bit) with an optional VRAM upgrade which brings the total to 512 KB.

My card has the upgrade pre-installed and the chips are soldered to the board.

The card is pretty basic which two banks of VRAM, ROM and a video processor.	Here you see the GPU on the card. It seems to be a joint effort with Apple and Toshiba.
Here are some of the 150ns VRAM chips.	The two banks of VRAM chips. Each row of 8 chips totals 256 KB. The upper bank is the expansion memory which is pre-installed on this card.
The ROM chip on the board.

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