Tandy 1000 Technical Reference Manual

Tandy 1000
Technical Reference Manual
INDEX output signal
lJ
11
Lobe pattern
(TP9,10)
A B
A
B
Notes: 1. The lobe pattern ratio is calibrated in the SKA according to
the following expression.
A-B
Lobe pattern ratio : Lar er one of A & B xlOO-Calibration valu'
after callbratlon 9
2. If the calculated value with the above expression is posit)
the polarity is plus, while the polarity is minus when the
value is negative.
(Fig.409) Calibration of alignment lobe pattern
(3) Index burst timing
(a) Key in "E5". (CALIBRATION INDEX TIMING)
(b) The calibration value set at that time is indicated in the latter
three digits of the DATA indicator CIJ:I] (~s), and the polarity i~
indicated in the initial digit. (Refer to item (l)-(b)).
If a "0" is indicated, the polarity is positive.
(cl Key in a polarity and a new calibration value (three digits, Max.)
written on the alignment disk label. Refer to item (l)-(c) for the
polarity designation.
(d) Key in "F". (STOP)
Note: If there is no change in the calibration value in item (b), omit
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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