Paltest; Vp Age - Tandy Color Computer 3 TRS-80 Diagnostic Manual

TECHNICIAN SERIES DIAGNOSTIC SERIES
------------- TANDY COMPUTER PRODUCTS -------------
- PALTEST/BAS -
PALTEST is a Basic program which tests the color palette registers of the
ACVC chip of the color computer-3.
To execute this diagnostic: type
RUN "CPUSPEED/BAS"
and press
<ENTER).
The test should then appear on the screen.
Observe the 16 circles on the screen. Each of these represents a palette
register. The color inside of the circle is the current color of that pallet
register. These will change as each palette register is being tested.
The test terminates if an error occurs or when it .is completed. If an error
occured, it will report the palette# of the error, the data written, and the
data read. If no error occ ured, the test will display, "All Pallets OK!".
- VP AGE /BAS -
VPAGE is a Basic program which tests the Video Paging Register of the
Advanced Color Video Chip (ACVC). The program uses a machine language
routine to fill memory with a graphics pattern, then the basic program
initializes the video paging register for the test.
To execute this diagnostic: type
RUN "VPAGE/BAS"
and press
(ENTER).
The test should then appear on the screen.
A pattern should appear on the screen when the test begins. As the program
tests the video paging register, it is repointed making the screen appear to
move left, up, and diagonally to the upper left corner. The pattern on the
screen should appear to move these three directions, if it doesn't then check
the ACVC. It's section that positions the video in memory may be faulty.
Since VPAGE is a continous test, press the
<Q>
key to exit to Basic.
COLOR COMPUTER-3 DIAGNOSTICS
- 8 -