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Section 1. Reference Data
1.1 FUNCTIONAL CHARACTERISTICS
The 5444 is available in the following models:
Model 1. Fixed disk and removable disk, using tracks
000 through 103 of each disk, and providing a storage
capacity of 2.46 million bytes.
Model 2. Fixed disk and removable disk, using tracks
000 through 203 of each disk, and providing a storage
capacity of 4.92 million bytes.
Model 3. Removable disk only, using tracks 000 through
203, and providing a storage capacity of 2.46 million
bytes. Model 3 can only be installed as an addition to
Model 2.
1.1.1 Format
Using a format of 256 data bytes in 24 sectors, the
storage capacity is arranged in the following manner:
Each track:
6,144 bytes
Each cylinder:
12,288 bytes
Each disk:
2.46 million bytes.
The format is completely determined by the program
of the using system. Figure 2-1 illustrates typical track
and sector formats.
1.1.2
Speed
The speed of the 5444 is as follows:
Rotation time:
40 milliseconds, that is, 1,500 rpm
Data rate:
200 kilobytes per second
Single-track access:
39 milliseconds maximum.
1.2 INTERFACE
Figure 2-2 shows the interface connections at the 5444.
Logic circuits within the 5444 use SID*/100 signal
levels, and the lines at the interface are at these levels.
The SID/100 levels are as follows:
Positive(+):
+3.0V to +6.6V
Negative(-):
OV to +0.3V
Note: The 'rd data' line is at a special level of
approximately OV to -3V.
*
Solid Logic (Dense)
5444
(< 30100) FETMM
(5/70)
1-1
Sector Format
Address and Identifier Field
256-Byte Data Field
\
Track Format
\
Sector 00
\
Sectm01
/
Sector 23
Sector 00
Data
~lfil
A & I
I
Data
~
m~~A-&~l'~-Dat_a~~~~A_&_l~'~D-ata~~~~~~~A-&~1,r--~__,,_.._.~-y--~~__..
L.
A & I
=
Address and identifier field
5444 Model 1: 103 customer tracks (000 through 102) and CE track are used on one disk surface.
5444 Models 2 and 3: 203 customer tracks (000 through 202) and CE track are used on one disk surface.
Track 000 is used for initial program loading and for other system requirements.
Tracks 001, 002, and 003 are used as alternate tracks.
Track 103or 203 (as appropriate) is used as the CE track.
Figure 2-1. Typical Sector and Track Formats
[07526]
1.3 ALO PACKAGE
The page numbers of automated logic diagrams (ALD's)
for the 5444 are prefixed FN and WK. Wiring diagrams
and component location diagrams are prefixed ZA and
ZZ. Page OA-000 supplies an index to the major AID
page groups.
L..
Chapter 1. Reference Data and Diagnostic Techniques
Using
I
System
Interface
5444
I,
<J--T_A_P_L_in_e_B _ _ _ _ _
---<
0
1
~::~::s.
TAP Line A
}
TAP Line C
see 2.5
I
'
- Head Select Lower
I
--.
- Head
S!!le~t
l}J?per
I
- Read Select
I
....
- Write Select
....
I
- Power On Reset
l
I
I
Logic Board
_+Read Data
Location
- Double Frequen<!Y_ Write Data ....
Y-W1 N6
(See ALO page
_ + Data Unsafe
WK
200)
+ 18V de
-
- Disk Select Upper
--.
- Disk Select Lower
....
- Erase Select
--"
- 18V de
-
- Cartridge Safe
--
_+Track Crossing
- Access Forward
-..
Logic Board
- Access Reverse
Location
--
Y-W1 M6
_ - Access Overrun
(See ALO page
-Home
WK 200)
-
- Ready
+ Index Pulse
-
+ 6V de
~
-4V de
--
-30V de
Logic Board
--
+ 24V de Regulator
Location
......
TB 3
DC Ground
.
(See ALO page
....
+ 24V de Driver
ZA 250)
~
+ 24V de Driver Common
_..
+ 24V File Start
_..
Figure 2-2. 5444-to-System Interface
[07527)
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