This card generates the video signals for one of the CRT displays in the cockpit. There are two of these cards in this unit. It consists of two PCB’s back to back. There is an Z180 compatible microcontroller onboard paired with 256kb of SRAM plus an additional 64kb for parity. There’s another 256kb bank of SRAM but no parity used on that one. Guess that’s the framebuffer memory.