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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

'--

'-

~fa.o/

APPLE DISC-l CONTROLLER

BOOTSTRAP PROM PIN ASSIGNMENTS

Function

AO

Al

A2

A3

A4

A5

A6

A7

DO

Dl

D2

D3

D4

D5

D6

D7

PROM pin u sed

AO

Al

A2

A3

A4

A7

A6

A5

DO

Dl

D2

D3

D7

D6

D5

D4

pin number

1

2

3

4

5

19

18

17

6

7

8

9

14

13

12

11

Co 1'1 -n 'd t /I --Jr 'cd