Tandy 1000 Technical Reference Manual

Tandy 1000
item (cl and depress "F" key.
Technical Reference Manual
e.g. Double sided FDD, SIDE 0 ALIGNMENT +3%, SIDE 1 ALIGNMENT -5\,
INDEX TIMING -25ws:
EO 3 F, El B 5 F, E5 B 25 F
INDEX output signal ~~ ~
Index burst (TP7,8)
~~-+--Index burst timing
Notes: 1. The index timing is calibrated in the SKA according to the
following expression.
Calibrated timing = t - calibration value (~s)
2. If the calculated value with the above expression is
positive, the polarity is plus, while the polarity is minus
when the value is negative.
(Fig.4l0) Calibration of index burst timing
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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