7.4 A Simple EPROM Interface Example 
50-PIN HEADER

49(aF) ---
47(aE) ---
45(aD) ---
43(aC) ---
41(aB) ---
39(aA) ---
37(a9) ---
35(a8) ---
33(a7) ---
31(a6) ---
29(a5) ---
27(a4) ---
25(a3) ---
23(a2) ---
21(a1) ---
19(a0) ---
17(NC)
15(d7) ---
13(d6) ---
11(d5) ---
 9(d4) ---
 7(d3) ---
 5(d2) ---
 3(d1) ---
 1(d0) ---

20-PIN HEADER

19(CCLK )
17(RST/ )
15(BPRN )
13(BUSY/)
11(INTR/)
 9(not used)
 7(IOWC/)
 5(IORC/)
 3(MWTC/)
 1(MRDC/) ---

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