Tandy 1000 Technical Reference Manual

Tandy 1000
Technical Reference Manual
(b) Start the spindle motor and install an alignment disk.
(c) Set the head to the alignment check track.
Alignment check track: track 16
(d) Confirm that two lobe patterns as in Fig.425 can be observed (it is
not necessary that the levels of VA and VB are equal).
If only one lobe pattern can be observed or if two lobes become one
pattern, the head is not on the alignment check track.
In such event, execute step-out or step-in operation for 2 tracks
space to obtain the most similar waveform to that in Fig.425.
Note: The above number of tracks to be stepped is required to make the
alignment track position be fit with the magnetized condition of
the basic magnetized phase "A" of the stepping motor. I f the
stepped track numbers are inassured, set it again from track 00
(TRACK 00 output signal becomes TRUE).
For the FDD, the lobe pattern as in Fig.425 should be observed
at the track of even number.
(e) After one or several step-outs from the check track, step in the
head to the check track again and measure VA and VB at that time.
(f) Calculate the true value of misalignment by substituting the value
in item (e) and ALIGNMENT calibration value (see alignment disk label,
attention to the side) .
Misalignment (true value) E
VA-VB
Larger value in VA & VB xlOO
- Calibration value) - (Relative humidity - 50) x K
K
is humidity compensation factor.
K = 0.26
- 4067 -

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