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SILICON GATE MOS 8255
STi
PC
3
r--
PB
O
Do
PB,
0,
PB
2
O
2
PB
3
0
3
FLOPPY DISK
PB
4
.
.
0
4
CONTROLLER
AND
DRIVE
PBs
D
S
MODE
2-
PB
6
0
6
PB
7
0
7
PC
4
DATA
STB
PC
S
ACK (IN)
PC
7
DATA
READY
_Pe
6
ACK (OUT)
8255
PC
2
TRACK
"0"
SENSOR
PC
o
SYNC READY
PC,
INDEX
r-
PAO
ENGAGE
HEAD
PAl
FORWARD/REV.
P~
READ ENABLE
MODE
0 _
P~
WRITE ENABLE
(OUTPUT)
PA
4
DISC SELECT
PAs
ENABLE CRC
PA
G
TEST
_PA
7
BUSY
LT
ANALOG
INPUT
ANALOG OUTPUT
IP~
LSB
PAl
PA
2
I PA
3
J
PA
4
MODE 0
PAS
f-----------..
(OUTPUT) ; PA
6
12-BIT
PA
7
D-A
---.
CONVERTER
PC
4
(DAC)
PC
S
8255
PC
6
'-
PC
7
MSB
,PC
O
STB
DATA
PC,
OUTPUT
EN
BIT
I
SET/RESETl
PC
2
SAMPLE
EN
PC
3
STB
,...-
PB
O
LSB
PB,
8-BIT
A-D
PB
2
CONVERTER
..--
MODE 0
PB
3
(ADC)
-
(INPUT)
PB
4
PBS
PB
6
P~
MSB
INTERRUPT
REQUE
Digital
to
Analog, Analog
to
Digital
Basic Floppy Disc Interface
8
LEVEL
PAPER
TAPE
READER
PAo
....
-----1
R
O
PAl
R,
PA
2
R
2
PA
3
R
3
PA
4
R
4
MODE 1 PAs R
s
(INPUT) - PA
G
RG
PA
7
R
7
CRTCONTROLLER
• CHARACTER GEN.
• REFRESH BUFFER
• CURSOR CONTROL
INTERRUPT
REQUEST
I
...-------------.--.
PC
3
INTERRUPT
REQUEST
i
PC
3
""-PAo
~------t~.
R
o
PAl
R,
PA
2
R
2
PA
3
R
3
PA
4
R
4
PAs R
S
MODE 1 PA
6
SHIFT
(OUTPUT)- PA
7
CONTROL
PC
7
I-------t~.
DATA
READY
PC
6
ACK
PC
S
BLANKED
PC
4
BLACK/WHITE
8255
L.-
8255
PC
4
....
----
....
STB
PCs
ACK
PC
G
STOP/GO
L.-
....
...
MACHINE TOOL
-
PC
2
I--------li~.
ROW
STB
PC, COLUMN STB
PC
O
CURSOR
HN
STB
{
PCo
START/STOP
MODE 0
PC
.....
-----1
LIMIT
SENSOR
(H/V)
(INPUT) 1
PC
2
....
-----IOUTOF
FLUID
PB
O
I--------t~.
l
MODE 0 _ PB, !
(OUTPUT)
PB
2
i
1
1
CURSOR/ROW/COLUMN
PB
3
:--
ADDRESS
PB
4
! H & V
PBs
I
PB
6
J
,-P~
.....
----_..
.._------------~
I
PB
CHANGE TOOL
I
PB:
1--------t~.LEFT/RIGHT
J
PB2
UP/DOWN
MODE 0
PB
3
HOR. STEP STROBE
(OUTPUT)
lPB4
VERT. STEP STROBE
PBs
SLEW/STEP
PB
G
FLUID
ENABLE
PB
7
EMERGENCY
STOP
.....
.......
__
..
1._-----------_
...
Basic
CRT
Controller Interface
Machine Tool Controller Interface
5-128