Canon A-200 series Service Manual page 121

Diagnostic Programs
In order to check the computer and peripherals effectively and quickly, the A-200 has two diag ­
nostic programs as standard software. One is ROM-based power-on diagnostics and the other
is contained in the supplied disk.
ROM-based power-on diagnostics
This test program is contained into the built-in ROM and whenever a customer turns the com­
puter on or the RESET button is pressed, the computer will perform this test automatically. The
test program checks such devices or functions as ROM, RAM, keyboard, timer and video.
Following is a detailed flow chart of this test.
' - _ - . -_ _ JMP:
FE05B
Disable interrupt
Disable display
Initialize the DMA Page Register
Initialize the PPI
Disable parity error
Disable the N M I
Disable the DMAC
Check the ROM (FEOOO-FFFFF)
YES
Check the PIT
YES
HALT
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