ACR Y HAD LTSS FROM VFR SMA X IN TCA. EVASIVE ACTION TAKEN. SYS ERROR.

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SMA X DEPARTED RWY 29L AT MSP VFR TO ST CLOUD; MN. HE WAS GIVEN A 300 DEG HDG TO MAINTAIN 3000 FT AND CLRED FOR TKOF. DURING HIS DEP ROLL; A STAFF SPECIALIST DOING AN EVALUATION OF THE TWR PLUGGED IN TO LISTEN AT LCL CTL. SOME GENERAL CONVERSATION ENSUED WHILE HE SETTLED IN. ACR Y WAS PUT INTO POS ON RWY 29L. AFTER A LNDG ACFT TURNED OFF; ACR Y WAS CLRED FOR TKOF ON RWY HDG. ACR Y WAS SEBOUND AND WAS TO BE GIVEN A 260 DEG HDG AFTER DEP. DUE TO NOISE ABATEMENT CONSIDERATIONS ACFT CAN'T BE TURNED UNTIL THEY'RE PAST THE END OF THE RWY. GND CTL WAS STILL BUSY AND I WAS CHKING HIS TFC REF MINE COMING OFF THE RWY. IN THE MEANTIME I HEARD THE TWR COORDINATOR IN THE BACKGND TALKING TO THE TRACON ABOUT SMA X. I FIGURED HE HADN'T CHANGED FREQS; SO I TRIED TO SHIP HIM TO DEP AGAIN. IN THE MEANTIME; ACR Y RAN ABOUT 1 MI OFF THE DEP END OF THE RWY WITHOUT GETTING THE TURN TO 260 DEGS. I OBSERVED SMA X ABOUT 1 MI AHEAD OF ACR Y SO I ISSUED THE 260 DEG TURN TO ACR Y. ACR Y STARTED THE TURN AND WAS SHIPPED TO DEP. ABOUT 15 SECONDS LATER ACR Y CAME ON FREQ STATING HE WAS TURNING N TO AVOID TFC. I TOLD THE ACR Y ABOUT SMA X AND ASKED HIM IF HE HAD HIM IN SIGHT. HE STATED HE DID. ACR Y CLBED ABOVE AND TO THE N OF SMA X; THEN WHEN ALT SEPARATION WAS ESTABLISHED HE WAS TURNED W.