™ dual-disk subsystem with a total of 630KB
of formatted on-line storage. Includes two disk drives, S-100/8080/Z80 compatible
controller (Model 1071), drive enclosure, interface cable A and power supply.
The 1053-II is the dual-drive version of the single-drive 1043-II
Both drives are single head / single-sided drives. The roman numeral "II" indicates it
operates at 77 tracks / 100 TPI. This drive only accepts hard-sectored media when used
with the bundled Micropolis 1071
The subsystem is usually presented with a capacity of 630k. With the unit being a dual-drive
assembly, this can be misleading, suggesting each drive would hold 630k by using dual
heads writing on double sided media. In reality, each drive is a single head drive and stores
315k, but two drives with 315k provide 630k of on-line storage per unit.
Model 1053 Mod II
is a master module, used with a Micropolis 1071
controller and interface cable A
. Its sister-module
1033 Mod II
is an add-on module only.
Disk Latch Mechanism
The drive has file-protection circuitry and other standard features include a disk-insertion
interlock that prevents accidental damage to the diskette by preventing the user from closing
the drive door unless the diskette is positioned properly. Large lighted numerals clearly show
the logical address of each drive, to further prevent operating errors.
Note on Micropolis' floppy drive naming convention
If you ask yourself what the meaning of the Roman numeral literals in disk drive names
is, here's the explanation: Labeling convention for the Micropolis floppy disk drives
from the 1040/1050 series is that each model number is followed by either the notation
"Mod I" or "Mod II". These notations indicate whether the system operates at a track
density of 48 TPI (35 tracks total) or 100 TPI (77 tracks total). "Mod I" storage modules
have a black disk load actuator and "Mod II" modules have a blue disk load actuator.
A detailed chronicle of getting a Micropolis 1053-II floppy subsystem working on a rare Micro
Expander Inc. S-100 bus machine via 100085-01-8A controller board
can be found on German vintage computer tinkerer funkenzupfer's website