IC46 blue spot MAPPING ROM (sheet 2)
74S288 32 x 8-bit

+------ E, 14, A15
|+----- D, 13, A14
||+---- C, 12, A13
|||+--- B, 11, A12
||||+-- A, 10. A11
|||||
|||||  +--------- D8, 9, *PU upper prom
|||||  |+-------- D7, 7, *PL lower prom (x-bus pin 43)
|||||  ||+------- D6, 6, MB5 (pin 5 253D)
|||||  |||+------ D5, 5, *MB5
|||||  ||||+----- D4, 4, *I/O
|||||  |||||+---- D3, 3, MA6 (pin 6 253D)
|||||  ||||||+--- D2, 2, beta ic44-11
|||||  |||||||+-- D1, 1, alpha ic44-10
|||||  ||||||||
00000: 11001011 
00001: 11001011 
00010: 11001111 
00011: 11001111 
00100: 11101011 
00101: 11101011 
00110: 11101111 
00111: 11101111 
01000: 11011010 
01001: 11011010 
01010: 11001010 
01011: 11001010 
01100: 11011110 
01101: 11011110 
01110: 11001110 
01111: 11001110 
10000: 11111010 
10001: 11111010 
10010: 11101010 
10011: 11101010 
10100: 11111110 
10101: 11111110 
10110: 11101110 
10111: 11101110 
11000: 10001000 
11001: 10001000 
11010: 10001000 
11011: 10001000 
11100: 01001000 
11101: 01001000 
11110: 11001001 
11111: 11000000