Commodore Amiga A500 Technical Reference Manual page 34

'
6 5
4
3 2
1
0
Optional control status register
Write Read
Interrupt enable Interrupt enable
User definable don't care
Local reset must be
0
User definable don't care
User definable INT2 pending
User definable INT6 pending
User definable INT7 pending
User definable I
am pulling INT
(44146) 7 6 5 4
3
2
1 0
Reserved
Write
Not defined must be
00
(4814A)
7 6 5 4 3
2 1
0
Base address register, write only
=These bits are compared with A23 through A1
6
(or fewer) to determine the base address of this
board.
(4Cl4 E)
x x x x x x x x
Optional "shut up" address, a write t o this ad-
dress will cause the board to pass its config out
and then never again respond t o any address.
RESET will re-enable the board. The actual ad-
dress that has this effect is
4C. A
write t o 4E is
ignored. This is write only.
Reserved, must be
00
Reserved, must be
00
Reserved, must be
00
Reserved, must be
00
Reserved, must be 00
Reserved, must be
00
Reserved, must be
00
Reserved, must be
00
Reserved, must be 00
Reserved, must be
00
Reserved, must be
00
Reserved, must be
00
Note: The actual reserved values will be FF rather than
00,
because the system will invert them. See
the section on reading 110 locations for more information.