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Table C-1. CPU32Bug Customization Area (continued)
Offset
Default Value
$D0-16F
all $FF's
The Initialization Table is organized as a series of entries each of which has the
following format:
<ADDR> <CNT/SZ> <FILL> <DATA>
4
Where:
<ADDR>
<CNT/SZ>
<FILL>
<DATA>
M68CPU32BUG REV 1
Mnemonic
Initialization Tables
INITTBL
Initialization Tables #1 and #2.
1
0|1
is the destination address for the <DATA>. It is 4 bytes long and must
start on a even address (word) boundary. A value equal to the FILL_L
value ($FFFFFFFF) terminates the routine.
is the count/size code for the <DATA> and is encoded as "$ns" where:
n is the upper nibble and contains the count value minus one for
number of <DATA> elements of size "s" that are to be stored in
successive addresses, starting with <ADDR>.
s
is the lower nibble and contains the size code for the <DATA>
and the storage operation itself. Valid size codes are as follows:
1 = BYTE data
2 = WORD data
4 = LONG WORD data
An invalid size code terminates the routine.
is a dummy placeholder/filler that is only present for WORD and
LONG WORD sized <DATA> so they will be aligned on an even
address (word) boundary. Thus the fill byte is not present for BYTE
data, otherwise it is one byte long.
is the byte, word, or long word data as specified by <CNT/SZ> that is
to be stored starting at <ADDR>. This field contains exactly s*(n+1)
data bytes. If the data size is BYTE (s=1) and there are an even number
of <DATA> elements (n+1 is odd), then one filler byte is added so the
next Table entry will start on an even address (word) boundary.
Description
n
<--- # bytes
C-11
USER CUSTOMIZATION
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