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Disk II Phase Question

Subject: Disk II Phase Question
From: "Bryan Parkoff" <nospam@nospam.com>
Date: Thu, 13 Jan 2005 02:00:51 GMT
Newsgroups: comp.sys.apple2
Organization: SBC http://yahoo.sbc.com
Xref: g2news1.google.com comp.sys.apple2:6892
    Disk II Drive controller card has four phases.  Do only one phase cause 
the head arm to move from one track to one track?  For example, head arm may 
position at 48th track.  Phase 3 is turned on and turned off.  It caused the 
head arm to move from 48th track to 47th track.  It looks like that it would 
be from even track to odd track.
    The manual says that two phases are required so it can tell the head arm 
to move from even track to even track instead of one phase.  Is it correct?
    If we want odd track, then we have to execute three phases once before 
we execute two phases to tell head arm to position on each odd tracks.
    I have read Understanding Apple //e manual and Benath to DOS and ProDOS 
manual.  I do understand everything how it works, but I only don't 
understand the concept how "phases" work.
    Can you please explain in detail how "phases" can be used?  Please look 
at my example below that it shows phases in each tracks.
    Do each even/odd track have total ($5F00) 24,320 bytes in nibble?

Track 48

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 47

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 46

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 45

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 44

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 43

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 42

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 41

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 40

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 39

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 38

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 37

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 36

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 35

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 34

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 33

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 32

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 31

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 30

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 29

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 28

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 27

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 26

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 25

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 24

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 23

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 22

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 21

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 20

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 19

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 18

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 17

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 16

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 15

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 14

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 13

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 12

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 11

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 10

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 9

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 8

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 7

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 6

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 5

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 4

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 3

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 2

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off


Track 1

C081,X(62) ï¿½ C0E3 Phase 1-On

C080,X(62) ï¿½ C0E2 Phase 1-Off
C081,X(60) ï¿½ C0E1 Phase 0-On

C080,X(60) ï¿½ C0E0 Phase 0-Off


Track 0

C081,X(66) ï¿½ C0E7 Phase 3-On

C080,X(66) ï¿½ C0E6 Phase 3-Off
C081,X(64) ï¿½ C0E5 Phase 2-On

C080,X(64) ï¿½ C0E4 Phase 2-Off
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