I have a CPU Controller card (8085 based, vintage �1987). The motor blew on the machine, power surges came and went, and now it won't communicate with the outside world. One chip is totally (I mean tetotally) destroyed, right beside the serial port. The com port on the relevant pc has also been blown, beacuse it was connected at the time.
What was it? I know it's Texas Instruments, silver topped (SN something)
and 14 pin. It's partner in the RS232 circuit is a 75152 (a Line Driver). On this mystery chip, pin 7 is 5V ground, Pins 4, 9, 12 are to the 5V circuit. Pin 4 was really blown off the chip, and there sure was some heat around. Miraculously, the machine (A huge Turret Punch)
Has anyone a memory long enough to remember how these circuits were
configured? I am used to MAX 232s with electrolytics around; this board has no capacitors in sight. No power supply onboard. How did they do RS232 back in those days?
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With Best Regards,
Declan Moriarty
-- Author: Declan Moriarty INET: [EMAIL PROTECTED]
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