Commodore Amiga A500 Technical Reference Manual page 32

requirement is because the eight megabyte space reserved for ex-
pansion in the current machine begins a t hex 200000 (See auto-con-
fig notes below).
Auto-Config Notes
1) There is currently no provision for 6MB PICs. Designers of 8 MB
memory boards should consider auto-configs as two PlCs t o al-
low partial loading flexibility.
2 ) PIC sizelalignment rules are subject to change. If so, bit(s) will be
defined to allow a PIC t o specify that it is more flexible than the
old rules require.
3) The address map is subject t o change.
A
PIC should assume that
it may be placed anywhere in the address space.
4) All expansion devices are strongly encouraged t o use the auto-
config protocols. Assignment of fixed I10 addresses is subject t o
negotiation.
Address Specification Table
All nibbles except 00, 02,40 and
42
should be inverted.
Descriptions:
3 2 1 0
Board type and size
I
l
L ~ '
Memory size
000
=
8 megabytes
001
=
64 kilobytes
0 1 0
=
1 2 8 kilobytes
01 l
=
2 5 6 kilobytes
1 0 0
=
51 2 kilobytes
101
=
1 megabyte
1 1 0
=
2 megabytes
1 1 1
=
4 megabytes
L
Chained config request, indicates that the next
auto-config device in the daisy chain
is
physically
tied t o this device.
Optional ROM vector valid
I
L
Link into memory free list
L
Board type
00
=
Reserved
01
=
Reserved
1 0
=
Reserved
1 1
=
Current style board