Apple Lisa - Page 11

Confidential
Lisa Hardware Reference Manual
ADDRESS TRANSLATION
Logical Address
<- - - - 7 - - - -> <- - - - - - - - - 17 - - - - - - - - -)
+-_ - . ad _. - _---;.-.- __________________________ --+
I segment number offset
+---------+
I I logical page number I
I I (8 bits)
displacement
(9 bits)
+---,-----+
+------------+------------~
I
I
I
I
I
I
+-->
SORGII - SORGO
+-------+
o I I
• I I
• I I
5 I 000001100000 I
· +--------+
• I I I
I I I
127 I I I
+--- I -+
I
v v
+----_.--,--+
.----------+
Origin I
Logical page no I
+- - .---+
+----- - - ----+
I
+------> [+] <----+
I
v v
.. ---_. . . -------+
I physical page number displacement I
I (12 bits) (9 bits) I
+---- -------+--------+
Physical Address
(21
bits -- 2 megabytes)
Page 11
7-Jul-81