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回复 1# yovish

1. check how many pins of the chips.
2. check all lines

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回复 3# yovish

I did not have this chip for testing.
Did you test with actual 7491 chips?
If you use GAL to test, because the number of pins is different, so that the chip cannot be automatically identified

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回复 5# yovish
all first vector line should be reset(if possible).
this is a  8 bits shift register . but no reset pins.The initial value may be wrong when searching.

so:
data inputs=0.   reset rigister  with 8 clks line
then  Starting  test.

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回复 7# yovish

I mean  that your vector table should have 16 rows, the first 8 items set the initial value, the output result ignore(x), and the next 8 rows starting test the output results.

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回复 9# yovish

I know the reason that it can’t be automatically identified
Because this chip is actually as shown in the figure below, these two pins are not used (NC). During the automatic find, check the number of pins. This chip is set to 14-pin in software, but it is detected that this chip is 12-pins, Only 12-pin chips will be tested in the software, so it cannot be recognized.

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2021-8-14 08:32

If you want to be able to identified automatically, the vector table is made by the 12-pins chip

This is a very special type
I will modify this vector table to make it be recognizable.