Tandy 1000 Technical Reference Manual

Tandy 1000
(2) SKA method
Technical Reference Manual
(a) Connect the SKA referring to item 4-2-4 and set the FO PWR switch
to the PSA side.
(b) Use two channels of an oscilloscope. Connect the 1st channel to the
DOUT terminal of the SKA and the 2nd channel to the DIF terminal of
the SKA. Apply positive trigger by DOUT terminal.
Oscilloscope range
The 1st channel: DC mode, 2V, 20rnsec
The 2nd channel: AC mode, IV, 20msec
(c) Key in "B9F" (INDEX observation)
(d) Start the spindle motor by key "5". (MaN indicator turns on).
(e) Install an alignment disk.
(f) Execute drive select by key "0". (050 indicator turns on).
(g) Key in "CO" and confirm that the TRACK indicator becomes "00".
(RECALIBRATE)
(h) Set the head to the alignment check track.
Key in "C2 16" and confirm that the TRACK indication becomes "16".
(i) Confirm that two lobe patterns as in Fig.425 can be observed by the
oscilloscope (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-in or step-out operation for 2 track
space to obtain the most similar waveform to that in Fig.425. Step
operation can be done by key "8" (STEP-IN) and key "9" (STEP-OUT).
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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