Tandy 1000 Technical Reference Manual

Tandy 1000
Technical Reference Manual
(Fig.425) Alignment check lobe pattern
e.g. VA=0.58V, VB=0.61V, Calibration value= -6(\),
Relative humidity=65\
Misalignment (true value) = ( 0.58 - 0.61 x IOO-(-6)} _ (65-50)
0.61
xO.26 '" -2.8\
If the calculated value is positive, the magnetic head is shifted
inward from the reference position, while the head is shifted outward
from the reference position when the value is negative.
(g) Conversely, measure VA and VB when the head is on the alignment check
track by stepping-out after one or several step-ins.
(h) Calculate the true value of misalignment as described in item (f).
(i) Confirm that both of the calculated values in items (f) and (h) are
within the following range.
True value of misalignment: 30\, Max.
(j) For a double sided FOO, execute items (c) through (i) for the side 0
and the side I heads respectively.
(k) If the value in item (i) or (j) is out of the specified range, adjust
the track alignment according to the following procedure:
i) Loosen two fixing screws of the stepping motor a little.
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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