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This test also determines if the CPU is a 486SX without an NDP or a DX with the
NDP. If the 486SX is installed, the test isn't executed. If the 486DX is installed,
the test is executed.
3.14 Expansion Unit Test
NOTE: If an expansion unit is not connected to the system, this test cannot be executed.
Subtest 01
Box Wraparound
NOTE: To execute this subtest, a wraparound board must be installed in the expansion
unit.
The following tests are executed.
Clock test (LSC, CLK, ALE)
Interrupt test (IRQ3, 5)
DMA test (channel #1, 3 or TC status)
Data bus test (00h - FFh)
Address bus test (A0000h - AFFFFh)
Wait CNT test
Subtest 02
Box Mono Video - RAM
NOTE: To execute this subtest, a monochrome display card must be installed in the
expansion unit.
This subtest writes data (FFh, AAh, 55h, 00h) into the monochrome display memory
(B0000h to B0F9Fh), then reads the data out and compares it with the original data.
Subtest 03
Wraparound Test (51-bus)
NOTE: To execute this subtest, a wraparound board must be installed in the expansion
unit.
The following tests are executed.
Clock test (OSC, CLK, ALE, DACK0)
Interrupt test (IRQ7-3, IRQ14, IRQ12-9)
DMA #1 test (channel 1...3, or TC status)
Data bus test (00h-FFh)
Address bus test (C0000h-CFFFFh)
Memory W/R test
IO16 test
MASTER test
3-33
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