Avago Technologies LSI53C1010R - Manual (Page 117)

MAD Bus Programming 3-23
Version 2.2 Copyright © 2000–2003 by LSI Logic Corporation. All rights reserved.
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MAD[0], slow ROM – When pulled up, this pin enables use of slower
memory devices by including two extra data access cycles.
Note: All MAD pins have internal pull-down resistors.
Table 3.18 MAD[3:1] Pin Decoding
MAD[3:1] Available Memory Space
000 16 Kbytes
001 32 Kbytes
010 64 Kbytes
011 128 Kbytes
100 256 Kbytes
101 512 Kbytes
110 1024 Kbytes
111 No external memory present