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hello,thanks for your reply.
I cannot use the keyboard to print,cause i would print some symbol and not number.
I thought that is some eeprom where the chacarcter are stored and if so i can reprogram this to print my own symbol.
But if not so, how can i sniffer the communication between the cpu and the printer mechanism to know how interface my own circuits?
Good price on that printer Harvey, but it's a thermal printer not a dot matrix, not sure if this matters, but you're going to be stuck with whatever charactor set is built into it, unless you want to modify it, for the price though it looks like a really good deal. The site Nigel posted looks good but I'd be a little wary, there are no prices listed and the only naked dot matrix line printers I've ever seen are in the digikey catalog and they're 150+ dollars each.