Current Version Manuals Interfacing To The RC210
Version 4.1 Hardware Manual Interfacing a Kenwood TKR 75x/85x/NXR710/810 repeater to the RC210
Version 4.1 Assembly Manual How to connect IRLP/Echolink/Allstar directly to the RC210
Version 8.05 Firmware Operations & Programming Manual Interfacing a Kenwood TKR 720/820 to the RC210
RAD Audio Delay (new design with pots) Interfacing an MTR-2000 to the RC210
RAD Audio Delay (old design with DIP switch) Interfacing TS64/GE MastrII to the RC210
AP1 Intelligent Autopatch (for RC210 Firmware 7.32 and earlier) Interfacing a Radio Shack WX-250 to the RC210
AP1 Intelligent Autopatch (for RC210 Firmware 7.36 and later) Interfacing a CAT WX-250 to the RC210
RCP Windows© Programming Software (PDF)  Interfacing the Kenwood TM-v71a to the RC210 
RCP Windows© Programming Software (CHM)  Interfacing the Kenwood TM-281a to the RC210 
RTC Real Time Clock Module Interfacing to the Daniels Repeater 
ADR Interface for DR1-X  Using an IC-7300 with the RC210 (by Don L. Blanchard - WA7GTU)
ADR Interface for DR2x  Interfacing the Kenwood TM-271a to the RC210
Modifying the older design DR1x ADR Interface To Use With The DR2x
DVR Upgrade for RC210 

RC210 Modifications RC210 Enhancements
Modification of very early RC210 boards for use with the AP1  How to simulate more than 3 Ports so you don't have to tie up a Port
Fixing audio level changes on early version pc boards  How to add more DVR time (by using an external module)
Curing clicks and pops on early version pc boards Modifying the Kenwood TM-g707 for CTCSS decode operation
Curing CW ID level changes on early version pc boards Modifying the Kenwood TM-271/281 for CTCSS decode operation
  RCP Protocol (how to serially communicate with the RC210)