Tandy 1000 Technical Reference Manual

Tandy 1000
3-1-2. Mechanical Section
Technical Reference Manual
Since the disk is a flexible recording media made of mylar film base
and data interchangeability between disks and FDDs is required, the
mechanical section of the FDD uses precision parts and it is also
assembled with high precision. For this reason, only trained technicians
can handle the internal mechanism. Never apply excessive impact nor
drop the FDD down on the desk.
The mechanical section is constructed with frame (chassis), door
mechanism, disk clamp mechanism, disk rotation mechanism, magnetic head
and carriage, head seek mechanism, various detection mechanisms, etc.
(1) Frame (chassis)
The main structure for mounting the various mechanisms and printed
circuit boards. The frame is made of sheet metal to maintain the
stability of the FDD in strength, precision,durability, and expansion
coefficient.
(2) Door mechanism and disk clamp mechanism
The door mechanism is constructed with clamp spring (plate spring),
front lever, set arm, etc. The end of the clamp spring makes the
disk clamp mechanism (collet Ass'y) move up and down.
When a disk is inserted and the front lever is closed, the tip of the
collet is inserted in the central window of the disk and the window
area is depressed to the spindle so that the center of the disk is
clamped in the correct position along the outer circumference of the
collet.
(3) Disk rotation mechanism
The disk rotation mechanism comprises DO motor Ass'y which includes
spindle.
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Tandy 1000 Specifications

General

Processor	Intel 8088
Processor Speed	4.77 MHz
RAM	128 KB (expandable to 640 KB)
Operating System	MS-DOS 2.11
Manufacturer	Tandy Corporation
Release Year	1984
Storage	Single or double 5.25" floppy disk drive (360 KB), optional hard drive
Sound	Tandy 3-voice sound
Ports	Parallel, Serial
Graphics	CGA (Color Graphics Adapter)
Graphics Modes	320x200, 640x200