Sharp MZ-5500 User Manual

-
MZ-5600
SET PRoTECTION
A
I ,
I
CALL THE
SET THE PROT~CTION
SETUP ROUTINE\IN
PROTECTION
SETUP
ROUTINE
400H ~ 7FFH OR
THE VRAM
I
I
ASSIGN BANK 1
SET TASK REGISTER I
WITH "0"
SET PROTECTION
I
MEMORY
SAVE SS, SP AND SET
I
THE STACK AREA IN
400H ~ 7FFH OR
RETURN
THE VRAM
I
I
B
A
6. I/O DeCODER LOGIC
6-1 Block diagram
LSI88
+5Vo-- G
YO
~
IOACC
J'
G
YI
~
A~
G
A7
Y2
~
~
A8
7E YS
~
A
Y4
~
B Y5
I"'"
AS
-
C
YS
Y7
A4-S
A9
LSI38
A9
G YO
ALE
l'
G
YI ....
l'
G
Y2 ....
SE
YS ....
A4
A
Y4'"
A5
B
Y5 ....
AS
C
YSlo..
-
Y7
Fig. 33
As shown in the above figure, two integral decoders LS138's
are used to provide chip selection for each I/O device on
the CPU board.
-28-
B
I
RESTORE SS, SP
1
END )
~
CSDMA!
c
CSPIO
CSFOC
CSPIC
1 OWait
CSPIC
2
CSUAD
CSPA
BJ5C
CSSIO
CSCTC
CSRTC
CSPSG
. SWait
CSAKC
CSAKS
eSRET
~

Sharp MZ-5500 Specifications

General

Brand	Sharp
Model	MZ-5500
Category	Desktop
Language	English