Super Disk Drive
The MSD Super Disk Drive (SD-1) offers more than Commodore®compatibility. The larger 4K buffer
memory is a
significan t advantage to programmers for creating more powerful programs. It opens more files
at any time, and many
internal operations are faster.
(_ ""nique external packaging of the SD-1 means less physical space is required, saving dollars in ergonomic space efficiency.
6amaging heat retention is also minimized.
~
Internal state-of-th e-art design provides greater durability for longer life, and more speed and
power for internal
operations. Formatting diskettes can be accomplished in 18 seconds, and utility commands executed
within the drive are
faster.
MSD Serial and IEEE-488 interfaces can be used with the SD-1. Both are compatible with the complete
Commodore
computer line. IEEE operations means more than twice the speed of serial interfacing which results
in cost effective labor
savings.
Dual Disk Drive
The Dual Disk Drive (SD-2) offers the same advantages at the SD-1 including additional power.
The IEEE-488 interface
enhances the SD-2 with greater speed.
Many programs requiring both program and data disks can be run without stopping to change
disks. The dual capacity of
the SD-2 means no more time and effort wasted on the load/unlo ad/load process. Informatio
n for backup purposes can ·
be transferred from one disk to another in one step.
The SD-2 can be configured as a single disk drive, and costs less than that of two single disk
drives.
Cfij)
SD-1
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• 4K buffer memory
• Unique packaging design
• takes up less physical space
• minimizes component-damaging heat
• State-of-the-art internal design
• greater durability and reliability
• more speed and power
• Serial and IEEE Parallel interface
• IEEE provides twice the speed of serial
• compatib ility with all Commodore computers
• 6K buffer memory
• Dual disk capability
• Disks can be copied faster and easier for backup
purposes.
• Costs less than two single disk drives.
• Can be configured as two single drives or one
dual drive.
MSD SUPER DISK DRIVE TECHNICAL SPECIF/CATIONS
STORAGE*
Total Capacity
Sequential
Relative
Directory Entries
Blocks
Tracks
Sectors
Bytes
Diskettes
• 174848 bytes per diskette
168656 bytes per diskette
167132 bytes per diskette
65535 records per file
144 per diskette
683 total per diskette
664 available per diskette
• 35 per diskette
17 to 21 per track
256 per sector
Standard SW', single
sided, single density
*NOTE: The SD-2 contains two disk drive mechanisms and can therefore handle two times the
above capacities (one for each diskette).
SOFTWARE
16K Bytes Operating System
4K RAM buffer area (6K for the SD-2)
Microprocessor based disk controller (65110)
Commodore Compatible Serial Bus Interface
Commodore Compatible IEEE Parallel Bus Interface
INTERFACE
Dual Commodore compatible Serial Bus
Commodore compatible IEEE Parallel Bus
Jumpers for selecting device number 8, 9, 10, or 11.
t•SG
PHYSICAL
Dimensions
Height
5.9''
Width
3.9''
Depth
12.4"
S0-1
(150 mm)
(100 mm)
(315 mm)
5.9''
5.6"
12.4"
SD-2
(150 mm)
(143 mm)
(315 mm)
ELECTRICAL REQUIREMENTS
Voltage
Frequency
Power
110 or optional 220 VAC ·
50 or 60 Hertz
50 Watts
10031 Monroe Drive, Suite 206 • Dallas, Texas 75229 • 214-357-4434 •Outside Texas 800-527-5
285
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