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 oscilloscope and connect them as follows:
i) The 1st channel: SKA DOUT terminal
DC mode, SV, lOmsec
ii) The 2nd channel: PCBA MFO control TPI (Track 00 sensor), IV range
iii) External trigger: DIRECTION SELECT interface signal (Interface
connector pin No.lB) or Pin 3 of J3 (resistor
network RAI for terminator) on the PCBA MFO
control.
(+) trigger.
(c) Key in "BB F". (STEP observation)
(d) Start the spindle motor by key "5". (MaN indicator turns on).
(e) Install a work disk.
(f) Execute drive select by key "0". (050 indicator turns on).
(g) Set the step rate and the settling time as follows referring to item
4-2-4-3.
Step rate : 6msec
Settling time : lSmsec
(h) Key in "CO" and condirm that the TRACK indicator becomes "00".
(i) Key in "CS". (TOO TIMING, SEEK ±S)
(j) Measure the tA and tB timings according to Fig.427 and confirm the
- 407B -

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