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DISKETTE DESIGN
The MDC contains the circuitry necessary to
support the device adapter connections. All cir
The diskette has been engineered with versa
cuitry pertinent to the diskette (including the
tility and simplicity in mind, making it a highly
power supply) is contained in the diskette adapter
compact and reliable device in the areas of
module. Through its adapter, each diskette pre
operation and maintenance. The diskette is versa
sents a DMA (Direct Memory Access) interface to
tile, in that it may be used as a desk top device
the Level 6 processor. See Figure 5-3.
(convenient when using disks interchangeably) or
rack-mounted as a slide-in unit within a Level 6
system cabinet. The total disk package being only
lEVEl6
eight inches square simplifies handling and mail
--,
SYSTEM
~
MDC9101 SINGLE BOARD
I
L-
MULTIPLE DEVICE
ing.
I
CONTROLLER
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DISKETTE CONFIGURATION
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Diskettes available for Level 6 system use are
:
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r--------,
:
I
the DIU9101 Single Diskette and the DIU9102
: :
DIMD101
~
l O N E ADAPTER PER ONE OR
L_~
~~~:TTET;
~
- - - -
-~
~~~,~~~~E;~~~IGURATION
OF
Dual Diskette. The DIU9102 consists of two
:
MODULE
i - :
. . .
11---_ _ FOUR DEVICES PEA ONE
L _ _ _ _ _ _ _ _
~
MDC9101
DIU910 I single diskettes with a DIM91 0 I Diskette
Interface Adaptor that includes a power supply.
The diskettes are available singly or in a dual
configuration. However, a DIM9101 Adapter is
capable of supporting only two DIU9101 devices.
Adding a diskette or two would require an
additional diskette adapter and power supply.
DUAL DISKETTE CONFIGURATION
Specifications and prime diskette characteristics
are described in Table 5-1.
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r----------
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OlM9101
:
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L __
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DISKEl rE
L __J
ADAPTER
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INTERCONNECTIONS/SYSTEM
INTERF ACE
1
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_~O~~L~
__
J
The diskette interfaces with the system bus of
the Level 6 processor by means of the MDC
DUAL DISKETTES
(Multiple Device Controller) and diskette adapter
-~
",""",,-""
c3
cr-
DISKETTE
and power supply. The MDC9101 controller is a
firmware-driven
microprogrammed
peripheral
controller. Multiple MDCs can be attached to the
Level 6 bus and multiple like adapters and devices
Figure 5-3. Diskette System Configuration
can be attached to any MDC. However, no more
than four peripheral adapters can be attached to
•
anyone MDC.
TABLE 5-1. DISKETTE SPECIFICATIONS/CHARACTERISTICS
SEEK TIME: 20 msec. (minimum), 260 msec. (average), 770 msec. (maximum)
LATENCY TIME: 83.33 msec. (average rotational latency)
TRANSFER RATE: 249,984 bits/second (adapter to diskette), 31,248 bytes/second (MDC to memory), 16124
words/second (MDC to memory)
DATA CAPACITY: 3,108,128 bits/disk (unformatted), 401,016 bytes/disk (unformatted), 256 bytes/disk
(formatted-77 tracks), 3,328 data bytes/track (formatted)
DISKETTE SPEED: 360 rpm
TRACKS PER DISK SURFACE: 77
RECORDING DENSITY: 3200bpi
DISK PACK USED: One 71/2 in. flexible Mylar disk with a magnetic oxide coated recording surface (M410 1 or
comparable media)
PHYSICAL DIMENSIONS: Single Diskette (rack mountable or table top) -7 .3in. (18 ,scm) high; 20.5in. (52em)
wide; 26.9 in. (68,3 em) deep; weight-60 lb. (27.2 kg). Dual Diskette (rack mountable)-14.6 in. (37 em)
high; 20.5 in. (52 em) wide; 26.9 in. (68,3 em) deep; weight-54.4lb. (120 kg).
DISKETTE DEVICE
5-2
AT04
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