I got a RT-200 gas flow analyzer,test function is normal. I want to know if any individual or organization is using it now?If you are still using, please contact me, send an email or post
I disassembled it,and backup 6 EEPROM programs,if there is a failure in the future, please use it for future maintenance,at the same time, I will upload the backup and share it with friends who need it
I see that the microcontroller on the motherboard has been polished,if you know the model number please let me know By observing the motherboard, I found that it has RS-232 function,I guess it may be used for calibration,you can contact me if you are interested
I hope to increase the functionality of this machine through my own efforts If you are interested or related questions, you can contact me, thank you
... and U14 (above J2) - MM74HC32N - is a Quad 2-Input OR Gate.
I see a few SN74LS374N there on the main board ... these are basically sets of eight clocked flip-flops; typically used for "driving the bus lines in a bus-organized system"!
OK ... here's another random guess:- it seems to me that U8 is tied to the two main expansion connectors (J5 and J6). I'm wondering if it (U8) is a VIA (Versatile Interface Adaptor); mainly as VIA's used to be popular back in the 1980's (again, the BBC Micro comes to mind). It looks like it may be an Intel device (with forty pins). Could it be the Intel 8255, I wonder?
That's enough for now, as I don't want to be dreaming about this stuff (it's midnight here).