MCT Serial board mystery - Can you crack the pinout code?
tothwolf at concentric.net
Sat Nov 15 15:00:29 CST 2014
On Sat, 15 Nov 2014, tony duell wrote:
>> It sounds like you've just about got it figured out though. If you have
>> the datasheet for the 1458 (aren't there 1459s on the board too?) then
>> you can follow the signals through the level converters back to the
>> UART, and its datasheet should then tell you exactly which signals are
> Are you not thinking of the 1488 and 1489 (commonly used RS232 driver
> and receiver chips)? The 1458 is a dual op-amp.
> Op amps were often used as level shifters in older RS232 devices. I
> guess that's what is happening here.
Yup, I was thinking 1488 and 1489. I guess there wouldn't be a 1489 on
there if they were using a 1458 as a level converter.
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