ic52 red spot I/O ROM FD0xH (sheet 5)
74S288 32 x 8-bit
 
+------ E, 14, gnd
|+----- D, 13, *WR
||+---- C, 12, *RD
|||+--- B, 11, A1
||||+-- A, 10, A0
|||||
|||||  +--------- D8, 9, NC
|||||  |+-------- D7, 7, NC
|||||  ||+------- D6, 6, NC
|||||  |||+------ D5, 5, FD01 (paddle trig sheet 8)
|||||  ||||+----- D4, 4, FD04 (ic29-11, sound)
|||||  |||||+---- D3, 3, FD05 (ic30-11, sound)
|||||  ||||||+--- D2, 2, FD00 (ic31-1, paddle, rs232, cass.in)
|||||  |||||||+-- D1, 1, FD06 (ic32-11, paddle, cass.motor, cass.out)
|||||  ||||||||
00000: 00010010 
00001: 00010010 
00010: 00010010 
00011: 00010010 
00100: 00011010 
00101: 00010110 
00110: 00010011 
00111: 00010010 
01000: 00010000 
01001: 00000010 
01010: 00010010 
01011: 00010010 
01100: 00010010 
01101: 00010010 
01110: 00010010 
01111: 00010010 
10000: 00010010 
10001: 00010010 
10010: 00010010 
10011: 00010010 
10100: 00010010 
10101: 00010010 
10110: 00010010 
10111: 00010010 
11000: 00010010 
11001: 00010010 
11010: 00010010 
11011: 00010010 
11100: 00010010 
11101: 00010010 
11110: 00010010 
11111: 00010010