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APPLE DISC-l CONTROLLER
DEVICE ADDRESS ASSIGNMENTS
(SLOT N)
$C080 + $NO PHASE A OFF
$C081 + $NO PHASE A ON
$C082 + $NO PHASE B OFF
$C083 + $NO PHASE · B ON
$C084 + $NO PHASE C OFF
$C085 + $NO PHASE C ON
$C086 + $NO PHASE D OFF
$C087 + $NO PHASE D ON
$C088 + $NO MOTOR OFF
$C089 + $NO MOTOR ON
$C08A + $NO SELECT DRIVE 0
$C08B + $NO SELECT DRIVE 1
$C08C + $NO A6 LOW
Head Seek
Stepping Motor
$C08D + $NO A6 HIGH State Machine
$C08E + $NO A7 LOW Program selects
$C08F + $NO A7 HIGH
APPLE DI SC- l CONTROLLER
TRACK ASS I GNMENTS
POS I TION TRACK
o o
1
2 1
3
4 2
5
6 3
7
8 4
9
10 5
11
STEPPER PHASE
A
B
c
D
A
B
C
D
A
B
C
D
APPLE DISC-1 CONTROLLE R
STATE MA CH INE INPUTS
AO- A3 Current state
A4 READ DATA from disc
AS QA (h igh order) from 74LS323
A6-A7 Specifies one of fou r programs
. DO- D3
D4 - D7
00 READ
01 SENSE WRITE PROTECT/ WRITE INITIALI ZE
10 WRITE
11 WRITE LOAD
STATE MACH I NE OUTPUTS
$0-$7 CLEAR
$8 HOLD
$9 SHIFT LEFT, o I NTO
$A SHI FT RI GHT , WRITE
$B LOAD FROM DATA BUS
$C HOLD
$D SHIFT LEFT, 1 INTO
$E SHIFT RI GHT , WRITE -
$F LOAD FROM DATA BUS
NEXT STATE
QH
PROTECT
QH
PROTECT
I NTO QA
INTO QA
APPLE OlSC-l CONTROLLER
STATE MACHINE PROM
PIN ASSIGNMENTS
State Machine Function
STATE ADR 0
STATE ADR 1
STATE ADR 2
STATE AOR 3
READ DATA from disc
QA from 74LS323
Program select A6
Program se l ec t A7
74LS323 Sl
74LS323 SO
74LS323 CLR
74LS323 SL input
Next State 0
Next State 1
Next State 2
Next State 3
PROM signal used
AO
A5
A6
A7
A4
A1
A2
A3
DO
01
02
03
04
05
06
07
Pin numb"er
1
17 .
18 ,
19
5
2
3
4
6
7
8
9
11.
12
13
14
( APPLE DISC-l CONTROLLER STATE MACHINE
SELF SYNC READ PROGRAM
(A7=0 A6=0)
STATE QA=O D=O QA=O D=l QA=l D=O QA=l D=l
0 DA RT,D 18 NOP,l 18 NOP,l 08 NOP,O
1 00 LFTl,O 28 NOP,2 28 NOP,2 28 NOP,2
2 00 LFTl,O 38 NOP,3 38 NOP,3 38 NOP,3
3 00 LFTl,O 48 NOP,4 48 NOP,4 48 NOP,4
4 00 LFTl,O 58 NOP,5 58 NOP,5 58 NOP,5
5 00 LFTl,O 68 NOP,6 C8 NOP,C 68 NOP,6
6 OD LFTl,O 78 NOP,7 C8 NOP,C 78 NOP,7
7 00 LFTl,O 88 NOP,8 C8 NOP,C 88 NOP,8 ()
8 00 LFTl,O 98 NOP,9 C8 NOP,C 98 NOP,9 CI 1
9 OD LFTl,O 09 LFTO,O C8 NOP , C A8 NOP,A ""'" ~ A CD LFTl,C BD LFTl,B C8 NOP,C B8 NOP,B ~ B D9 LFTO,D 39 LFTO , 3 C8 NOP,C AO CLR,A
C D9 LFTO,D D9 LFTO,D D8 NOP ,D 08 NOP,D (\ 3
D ID LFTl,l ID LFTl,l E8 NOP,E E8 NOP,E "j)
E FD LFTl,F FD LFTl,F F8 NOP,F F8 NOP,F St..:.. 'fi
F DD LFTl , D 6D LFT1 , 6 EO CLR,E EO CLR,E :. ::+-II .
-----
(
APPLE DISC-l CONTROLLER STATE MACHINE
WRITE PROTECT SENSE PROGRAM (WRITE INITIALIZE)
A7=0 A6=1
All bytes OA (RT, WPROT in, 0)
(
( (
APPLE DI SC-l CONTROLLER STATE MACHINE
WRITE PROGRAMS
, , . . A7=1 A6=0 A7=1 A6=1 . -- .... STATE QA=O D=O,l QA=l D=O 1 , QA=O D=O 1 , QA=l D=O 1 ,
0 18 NOP,l 18 NOPtI 18 NOP , l 18 NOP,l
1 28 NOP,2 28 NOP,2 28 NOP,2 28 NOP , 2
2 39 LFTO,3 39 LFTO,3 3B LOAD , 3 3B LOAD,3
3 48 NOP,4 48 NOP,4 48 NOP , 4 48 NOP , 4
4 58 NOP,5 58 NOP,5 58 NOP,5 58 NOP,5 ~ 5 68 NOP , 6 68 NOP,6 68 NOP,6 68 NOP,6 ~
""'t>
6 78 NOP,7 78 NOP, 7 78 NOP,7 78 NOP,7 ~ 7 08 NOP,O 88 NOP , 8 08 NOP , O 88 NOP,8
8 98 NOP,9 98 NOP , 9 98 NOP,9 98 NOP,9 ()
9 A8 NOP,A A8 NOP ,.A A8 NOP,A A8 NOP, A ~ A B9 LFTO , B B9 LFTO , B BB LOAD,B BB LOAD , B :J-
~ C8 NOP,C C8 NOP,C C8 NOP,C C8 NOP , C B "(,
C D8 NOP,D D8 NOP,D D8 NOP,D D8 NOP ,D ~
::f D E8 NOP,E E8 NOP,E E8 NOP,E E8 NOP,E
" E F8 NOP,F F8 NOP,F F8 NOP , F F8 NOP,F ---F 88 NOP , 8 08 NOP , O 88 NOP,8 08 NOP,O
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