I PLUGGED THESE INTO MY PK-88 TNC (TNC NOT INCLUDED). IF YOUR PK-88 TNC EPROM HAS FAILED, OR YOU HAVE THE OLDER PK-88 FIRMWARE. ALL FIRMWARE EPROMS ARE USED BUT HAVE BEEN TESTED TO WORK 100%. THIS ITEM IS SOLD USED BUT TESTED TO BE FULLY OPERATIONAL.
It brought my old, non-working PK-88 back to life. I appreciate that. One other chip needed replacement, but that became clear after the EPROM kicked the box back into life. My PK-88 now is fully functional again and being used with Winlink and with APRS.
These TNCs are are built like a Ship's Anchor. They are no longer made, but, if you are lucky enough to find one at a reasonable price, buy it. They are perfect for a packet node and for APRS.