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Diskette Design; Diskette Configuration; Interconnections/system Interface - Honeywell LEVEL 6 Operation Manual

Series 60 computer system.
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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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I
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
:
I
L __
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DISKEl rE
L __J
ADAPTER
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INTERCONNECTIONS/SYSTEM
INTERF ACE
1
L
_~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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