Tandy 1000 Technical Reference Manual

Tandy 1000
4-2-5. Others
(1) Total error test
Technical Reference Manual
In the check and adjustment in item 4-4, read/write error test is not
included. After the adjustment or the replacement of the maintenance
parts, it is recommended to perform a data error test by connecting the
FDD to the user's system or the TEAC simulator KB. The window margin
test is the most recommended item.
(2) Setting of FDD straps
It is required to confirm. before the operation that the straps (short
bars) on the PCBA HFD control are at the appropriate position for the
system to be used in the check and adjustment.
When the SKA is used, depress a key which number is the same as the
on-state short bar among DSO ~ 3 straps of the FDD and confirm that
the indicator is on before various key operations.
If the IU short bar is on, you can turn on the front bezel indicator
by "A" (IN USE) key of the SKA.
Notes: 1. For simplifying the explanation, following shows only the case
when the DSO short bar is on.
2. If the strap position of the FDD is changed from the initial
setting at the system installation, be sure to change it back
to the initial position after the maintenance operations.
(3) Connection of the probe ground
Connect the probe ground of the equipment as follows:
(a) For the observation at the test points (TP) 7 ~ 10:
Connect the probe ground to the G test point (OV) on the PCBA HFD
control.
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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