A circuit board for the Sol Computer. On the front of the board, there are three rows of integrated circuits. The top row is labeled 0-7 and the second row is labeled, "8, 9, A, B, C, D, E, F." There is a square heat sink in the upper right corner of the board; it has components in the middle and below. There are three white stickers along the bottom of the board. The first sticker says, "INIT E1F4/ CUSTE/18/ATH/F9DF/I/O DO98 FE77:. The second sticker says, "x 3/8/77 modified for Sol." The third sticker reads, "test ok 2-16-77."