APPENDIX G
AUTOCONFIG (TM)
The AUTOCONFIG protocol is designed to allow the dynamic assignment of available
address slots to expansion boards, eliminating the need for user configuration via
jumpers. Upon reset, each board appeals in turn at $E80000. with readable identification
information, most of which is in one's complement format, stored in the high nibbles of
the first $40 words ($80 bytes) of the board. This identification information includes the
size of the board, its address space preferences, type of board (memory or other), and a
unique Hardware Manufacturer Number assigned by Commodore Amiga Technical
Support, West Chester, Pennsylvania.
Each board contains configuration hardware including an address latch appearing in the
nibble at offset S0048 and a nibble at offset $004a. When A23 through A16 of the
assigned board base address are written to this register, the board latches and appears at
the assigned address, then passes a signal called CONFIG-OUT that causes the next board
to appear at $E80000. To make certain types of boards less expensive, an expansion
board's write registers may be organized as
- Appendix G 335 -
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