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eblc1388 said:It is unlikely to be MAX232 as this IC needs four external electrolytic capacitors to work and the capacitors are not visible in the image. I would guess the IC is a microcontroller, based on the two crystals, 330 ohms resistors, and the two LEDs near it.
Are you trying to repair it? If you want to build it, you're in for a big surprise.
There are also two crystals on the board, one is 6.000MHz and the frequency of the other not readable from the image.
You can buy these crystals no problem, but the presence of crystals indicate hiding somewhere there is/are microcontroller(s) or custom made IC which you cannot obtain or obtainable but won't work without firmware code .
eblc1388 said:The PIC is probably hiding under the black plastic in the form of a black blob.
OP already told us the power pins of the visible 14-pin DIP is 7 and 14 so it is unlikely to be a PIC.
eblc1388 said:I got it. The PIC is under the black plastic but on the inserted card.
The components are supporting chips act as signal source or buffer. I still think it is a simple serial port interface using resistors and transistors.
Nigel Goodwin said:Sorry, I didn't realise you didn't know that there is a PIC on the inserted card?, which is the complete reason for the programmer :lol: