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disk.txt
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1989-12-31
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PRT_LINE ⑧x1k1 חלללללל†
ãããããããããããããããããããããããããããããããããã´ DISK ´ãããããããããããããããããããããããããããããããããããããã
זלללללל¶
Single or Double Side (0 and 1)
80 Tracks (0 to 79)
~6250 bytes/track (Capacity 500,000 or 1,000,000 bytes/disk)
Speed ~300 rpm
םגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגאגגגגג™
ø TRACK STRUCTURE ø TOS ø
בגגגגגגגגגגגגגגגגאגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגדגגגגגœ
ø START OF TRACK ø Gap ~$4E ~$4E ... 32 mini ... ~$4E ~$4E ø 60 ø
בגגגגגגגגגגגגגגגגדגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגדגגגגגœ
ø SECTOR ø Synchro $00 $00 ... 8 mini ... $00 $00 ~$A1 $A1 $A1 ø 12 ø
ø ø Index Address Mark $FE ø ø
ø ø Track number 0-79 ø ø
ø ø Side number 0-1 ø ø
ø ø Sector number 1-n ø 1-9 ø
ø ø Sector length in bytes 0: 128 ø ø
ø ø 1: 256 ø ø
ø ø 2: 512 ø 2 ø
ø ø 3:1024 ø ø
ø ø Cyclic Redundancy Checksum $SS $SS ø ø
ø ø Gap $4E $4E ... 22 ... $4E $4E ø ø
ø ø Synchro $00 $00 ... 12 ... $00 $00 ~$A1 $A1 $A1 ø ø
ø ø Data Address Mark $FB/$F8 ø $FB ø
ø ø Data $XX $XX ... 128/256/512/1024 ... $XX $XX ø 512 ø
ø ø Cyclic Redundancy Checksum $SS $SS ø ø
ø ø Gap ~$4E ~$4E ... 24 mini ... ~$4E ~$4E ø 40 ø
בגגגגגגגגגגגגגגגגדגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגדגגגגגœ
ø ANOTHER SECTOR ø etc... ø 9 ø
בגגגגגגגגגגגגגגגגדגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגדגגגגגœ
ø END OF TRACK ø Gap ~$4E ~$4E ... 16 mini ... ~$4E ~$4E ø 664 ø
ijגגגגגגגגגגגגגגגגIJגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגIJגגגגגך
םגגגגגגגגגגגגגגגגגגגגגגגג™
ø TOS SECTOR ASSIGNMENTS ø
םגגגגגגגגגגגגIJגגגגגגגגגגגאגגגגגגגגגגגגIJגאגגגגגגגגגגג™
ø Physical Sector ø Track ø Single ø
בגגגגגגגגגגגגגגגגגגגגגג™ ø םגגגגגגגגגגגœ ø
ø Cluster ø ø ø Side ø Side Disk ø
בגגגגגגגגגגגגגגגגגג™ ø ø ø םגגגגגגגגגדגגגגגגגגגגגœ
ø Logical Sector ø ø ø ø ø Track ø Double ø
בגגגגגגגגגגגגג™ ø ø ø ø ø םגגגגגגœ ø
ø Contents ø ø ø ø ø ø ø Side ø Side Disk ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגאגגגגIJגגגגגגגגגגגך
ø Boot sector ø 0ø -ø1ø 0ø0ø 0ø0ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø FAT 1 ø 1ø -ø2ø 0ø0ø 0ø0ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø FAT 1 ø 2ø -ø3ø 0ø0ø 0ø0ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø FAT 1 ø 3ø -ø4ø 0ø0ø 0ø0ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø FAT 1 ø 4ø -ø5ø 0ø0ø 0ø0ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø FAT 1 ø 5ø -ø6ø 0ø0ø 0ø0ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø FAT 2 ø 6ø -ø7ø 0ø0ø 0ø0ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø FAT 2 ø 7ø -ø8ø 0ø0ø 0ø0ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø FAT 2 ø 8ø -ø9ø 0ø0ø 0ø0ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø FAT 2 ø 9ø -ø1ø 1ø0ø 0ø1ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø FAT 2 ø 10ø -ø2ø 1ø0ø 0ø1ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Directory ø 11ø -ø3ø 1ø0ø 0ø1ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Directory ø 12ø -ø4ø 1ø0ø 0ø1ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Directory ø 13ø -ø5ø 1ø0ø 0ø1ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Directory ø 14ø -ø6ø 1ø0ø 0ø1ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Directory ø 15ø -ø7ø 1ø0ø 0ø1ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Directory ø 16ø -ø8ø 1ø0ø 0ø1ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Directory ø 17ø -ø9ø 1ø0ø 0ø1ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Data ø 18ø 2ø1ø 2ø0ø 1ø0ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Data ø 19ø 2ø2ø 2ø0ø 1ø0ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Data ø 20ø 3ø3ø 2ø0ø 1ø0ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Data ø 21ø 3ø4ø 2ø0ø 1ø0ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Data ø 22ø 4ø5ø 2ø0ø 1ø0ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Data ø 23ø 4ø6ø 2ø0ø 1ø0ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Data ø 24ø 5ø7ø 2ø0ø 1ø0ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Data ø 25ø 5ø8ø 2ø0ø 1ø0ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Data ø 26ø 6ø9ø 2ø0ø 1ø0ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Data ø 27ø 6ø1ø 3ø0ø 1ø1ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Data ø 28ø 7ø2ø 3ø0ø 1ø1ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Data ø 29ø 7ø3ø 3ø0ø 1ø1ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Data ø....ø...ø.ø..ø.ø..ø.ø
בגגגגגגגגגגגגגדגגגגדגגגדגדגגדגדגגדגœ
ø Data ø 719ø352ø9ø79ø0ø39ø1ø
ø Data ø1439ø712ø9ø ø ø79ø1ø
ijגגגגגגגגגגגגגIJגגגגIJגגגIJגIJגגIJגIJגגIJגך
םגגגגגגגגגגגגג™
ø BOOT SECTOR ø
גגגגגגגגגגגגגגגגגגגגגגגגגגגIJגגגגגגגגגגגגגIJגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגג
Byte# Designation
------- --------------------------------------
0-1 0 or BRA.S address in this boot sector
2-7 Free text of 6 bytes
8-10 Disk serial number on 24 bits
11-12 #Bytes per sector = 512 | (Low-High)
13 #Sectors per cluster = 2 |
14-15 #Reserved sectors = 1 | (Low-High)
16 #File Allocation Table = 2 |
17-18 #Elements in directory = 112 | BIOS (Low-High)
19-20 #Sectors =720/1440 | PARAMETER (Low-High)
21 Media descriptor = $F8/$F9 | BLOCK
22-23 #Sectors per FAT = 5 | (Low-High)
24-25 #Sectors per track = 9 | (Low-High)
26-27 #Sides = 1/2 | (Low-High)
28-29 #Hidden sectors = 0 | (Low-High)
30-509 -
510-511 2 Bytes for adjust checksum of 256 words of bootsector
to reach $1234 for executable bootsector
םגגגגגגגגגגגגגגגגגגגגגגג™
ø FILE ALLOCATION TABLE ø
גגגגגגגגגגגגגגגגגגגגגגIJגגגגגגגגגגגגגגגגגגגגגגגIJגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגג
12 bits (3 nibbles) for each cluster with this code:
$000:Free cluster
$FF7:Bad cluster
$HML:Next cluster (H:High nibble M:Middle nibble L:Low nibble)
$FFF:End cluster
Logical: - - Cl.2 Cl.3 Cl.4 Cl.5 Cl.6 Cl.7 ...
$FF7 $FFF H2M2L2 H3M3L3 H4M4L4 H5M5L5 H6M6L6 H7M7L7
Physical: $F7 $FF $FF M2L2 L3H2 H3M3 M4L4 L5H4 H5M5 M6L6 L7H6 H7M7 ...
םגגגגגגגגגגג™
ø DIRECTORY ø
גגגגגגגגגגגגגגגגגגגגגגגגגגגIJגגגגגגגגגגגIJגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגגג
There are 112 entries of 32 bytes each.
byte#
0-7 Name ( 0:not used )
("."0:root directory )
(". ":current subdirectory)
("..":parent subdirectory)
( $E5:erased )
8-10 Extension
11 Type b5=archive bit
b4=subdirectory
b3=volume label
b2=system file
b1=hidden file
b0=read only file
12-21 -
22-23 Hour b15-b11=hours
b10-b5=minuts
b4-b0=seconds
24-25 Date b15-b9=year-1980
b8-b5=month
b4-b0=day
26-27 Starting cluster (Low-High)
28-31 Length (Low-Midl-Midh-High)