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8255A18255A·5
PA,
PA,
PA,
PA,
PA.
MODE
0
PA,
--
IOUTPUTI
PA,
LSB
12·BIT
INTERRUPT
REaUE
ST',
PC,
MODE 2
PA.
D.
PA,
0,
PA,
·
·
0,
PA,
0,
FLOPPY
DISK
PA.
· ·
D.
CONTROLLER
AND
DRIVE
PA,
·
·
0,
·
·
PA,
D·A
t--
CONVERTER
ANALOG
OUTPUT
PAs
0,
PC.
IDACI
PC,
r------
8255A
PC,
PC,
1----
MSB
PC.
r-----
SrB
DATA
PC,
OUTPUT
EN
BIT
SET/RESET
PC,
SAMPLE EN
PC,
STB
I
PB.
LSB
PB,
8-BIT
A·D
PB,
--
CONVERTER
MODE 0
PB,
IADCI
-
ANALOG
INPUT
(I
NPUTI
PB.
PB,
PB,
PB,
MSB
Figure 20. Digital to Analog, Analog to Digital
INTERRUPT
REaU
EST_:l
PC,
MODE 1
IOUTPUT!
8255A
MODE 0
IOUTPUTI
PA.
PA,
PA,
PA,
PA.
PA,
PA,
PA,
PC,
PC,
PC,
PC.
PC,
PC,
pc.
PB.
-
PB,
PB,
i
PB
,
I
I
PB
4
I
PB,
PB,
PB,
R.
R,
CRT CONTROLLER
R,
•
CHARACTER
GEN.
R,
• REFRESH BUFFER
R.
• CURSOR
CONTROL
R,
SHIFT
CONTROL
-
DATA
READY
ACK
BLANKED
f---
BLACKIWHtTE
ROW STB
COLUMN
SrB
CURSOR
HIV
STB
1-
CURSOR/ROW/COLUMN
ADDRESS
H&V
Figure
21.
Basic CRT Controller Interface
PA,
0,
PC.
DATA STS
PC,
ACK (IN)
PC,
DATA
READY
PC,
ACK
(OUT)
8255A
PC,
TRACK
"0"
SENSOR
PC.
SYNC
READY
PC,
INDEX
r
ENG,A.GE
~EA!)
FORWARD/REV.
PB, READ ENABLE
MODe a
PB3
WRITE
ENABLE
(OUTPUT)
PB4
DISC SELECT
PB,
ENABLE
CRe
PB,
TEST
PB,
BUSY
IT
Figure 22. Basic Floppy Disc interface
R
INTERRUPT
EaUES
Tj
PC,
MODe 1
(INPUT)
8255A
MODE 0
(INPUT)
MODE 0
(OUTPUT)
PA.
PA,
PA,
PA,
PA.
PA,
PAs
PA,
PC,
PC,
PC,
rca
PC,
PC,
PB.
PB,
PB,
PB,
PB.
PB,
PB,
PB,
---
R.
R,
--
R,
8
lEVEL
PAPER
R,
TAPE
R.
READER
R,
R,
R,
STB
ACK
STOP/GO
MACHINE TOOL
START/STOP
LIMIT
SENSOR
(HIV)
OUT
OF
FLUID
CHANGE
TOOL
lEFT/RIGHT
UP/DOWN
HOR.
STEP
STROBE
VERT.
STEP STROBE
SLEW/STEP
FlUID
ENABLE
1----
EMERGENCY
STOP
Figure
23.
Machine Tool Controller Interface
9-32
AFN-00744A-16