Дубли имеете ввиду другие микросхемы?
на самоц микросхеме написано c46cm3 на следующей строке логотип ST и надпись 450A.
по датащиту нашел,что это 96с43с. в нем указано,что они взаимозаменяемые с 93с46.С одним но:
DIFFERENCES BETWEEN ST93C46A AND
ST93C46C
The ST93C46C is an enhanced version of the
ST93C46Aand offers the following extra features:
– EnhancedESD voltage
– Functional security filtering glitches on the
clock input (C).
Refer to Table 2 (Absolute Maximum Ratings) for
more about ESD limits. The following description
will detail the Clock pulses counter (available only
on the ST93C46C).
In a normal environment, theST93C46 is expected
to receive the exact amount of data on the D input,
that is the exact amount of clock pulses on the C
input.
In a noisy environment, the amount of pulses received
(on the clock input C) may be greater than
the clock pulsesdelivered by the Master(Microcontroller)
driving the ST93C46C. In such a case, a
part of the instruction is delayed by one bit (see
Figure 9), and it may induce an erroneous write of
data at a wrong address.
The ST93C46C has an on-board counter which
counts the clock pulses from the Start bit until the
falling edge of the Chip Select signal. For the
WRITE instructions, the number of clock pulses
incoming to the counter must be exactly 18 (with
the Organisation by 8) from the Start bit to the
falling edge ofChip Select signal (1 Start bit + 2 bits
of Op-code + 7 bits of Address + 8 bits of Data =
18): if so, the ST93C46C executes the WRITE
instruction; if the number of clock pulses is not
equal to 18, the instruction will not be executed
(and data will not be corrupted).
Вот кстати фото с моим дампом и дампами других машин GS300
