Tandy 1000 Technical Reference Manual

Tandy 1000
4-2-4-5. Alignment disk calibration
Technical Reference Manual
Setting of the following calibration value is required for accurate
measurement before the check and adjustment of the track alignment.
Use a correctly calibrated (0% center) alignment disk with a calibration
value written on the label. The setting will be maintained until
the main DC power (for SKA) is turned off or until the RESET switch of
the SKA is depressed.
If the calibration value is the same as the initial value (0\) of the
SKA, the initial setting of the following is not required.
(1) SIDE 0 alignment
(a) Key in "EO". (CALIBRATION SIDE 0 ALIGNMENT)
(b) The calibration value set at the time is indicated in the latter two
digits of the DATA indicator [I][I] (\), and the polarity is indicated
in the initial digit. If a "0" is indicated, the polarity is positive.
Polarity indication: plus
I
,-,
minus -
(c) Key in a polarity and a new calibration value (two digits, Max.)
written on the alignment disk label.
Designation of polarity: Depress "B" key only for minus designation,
(No designation is required for plus).
(d) Key in "P". (STOP)
(2) Side 1 alignment (Double sided only)
(al Key in "EI". (CALIBRATION SIDE I ALIGNMENT)
(b) The same as in item (l)-(b) ~ (d).
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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