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Before they went into the CPU cloning business, AMD made chips that supplemented the activity of the Intel 8088. The P8253-5 is a Programmable Interval Timer and the P255A is a Programmable Peripheral Interface.
This large chip is a Linear Encoder with IBM's name on it.
The red arrows mark the bus chips from our triumvirate of chip manufacturers, Motorola, National Semiconductor, and Texas Instruments.
The yellow box indicates one bank of the RAM chips from Mostek. Each chip is 8KB, making for a total of 64KB when you account for all eight chips.