SMT X NON ADHERENCE TO ATC INSTRUCTIONS RWY INCURSION. PLTDEV.

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SMT X CALLED GND CTL ON FREQ 121.9 AND WAS INSTRUCTED TO TAXI VIA THE YELLOW LINE UP TO AND HOLD AT THE DEP END OF RWY 26L. THERE WAS ALREADY A HIGH WING SMA HOLDING AT THAT POINT AND SHORTLY THERE WAS TO BE AN AIRLINE REGIONAL LTT TO ARRIVE AT THE SAME PLACE. AS I MONITORED GND FREQ I DISCOVERED THAT THE INDIVIDUAL (THE LONE INDIVIDUAL) IN THE TWR WAS BROADCASTING ON GND; TWR; AND APCH CTL FREQS SIMULTANEOUSLY AND WAS CONDUCTING AN ASR APCH FOR AN MLT TO RWY 17. THE WINDS RPTED ON ATIS WERE 140 DEGS AT 26 KTS GUSTING TO 31 KTS. RWY 17 WAS THEREFORE MOST INTO THE WIND FOR LNDGS AND TKOFS WITH RWY 8L & R BEING THE NEXT CLOSEST. THE MLT Y; OBSERVING IT FROM MY COCKPIT WAS A GOOD 5 MI OUT ON FINAL WHEN I REQUESTED A DEP ON RWY 8L AND DECLARED AT THAT TIME THAT I WAS ENRTE TO A FIRE EMER. GND CTL THEN GAVE ME INSTRUCTIONS TO CROSS RWY 8R TO HOLD SHORT OF RWY 8L VIA TXWY CHARLIE. MLT WAS A GOOD 2 TO 3 MI OUT ON FINAL AND I DIDN'T QUERY THE GND CTLR CONCERNING THE TXWY DESIGNATIONS AND SINCE HE DIDN'T ASK IF I'D TAKE AN INTXN DEP I FIGURED I WAS CLRED TO THE TKOF END OF RWY 8L; WHICH HAPPENED TO BE VIA TXWY BRAVO WHICH CROSSES RWY 17. I TURNED AROUND THE SMA AND PROCEEDED W ON BRAVO UNTIL I REACHED A POINT APPROX 20 TO 30 FT ONTO THE TXWY WHEN THE CTLR YELLED FOR ME TO 'STOP' AND TO HOLD MY POS. I DID AS I WAS INSTRUCTED AND NOTED THAT I WAS ON AN OLD HOLD- SHORT LINE THAT HAD BEEN PAINTED OVER WITH BLACK PAINT. AT THIS TIME; I NOTED THE MLT'S POS AND IT WAS HIGH ON THE APCH WHAT LOOKED LIKE A MILE FINAL. THE GND TWR APCH CTLR THEN ISSUED A GAR FOR MLT; WHICH SEEMED TOTALLY UNNECESSARY AS I WAS NOT IN A POS THAT WOULD HAVE INTERFERED WITH ITS SAFE LNDG IF THAT WAS THEIR INTENT. NEEDLESS TO SAY IT WAS MY RESPONSIBILITY TO HAVE FOLLOWED THE INSTRUCTIONS CORRECTLY OR QUERIED THEM; BUT HIS ORDER TO THE MLT SEEMED ONLY BENT ON EXPANDING THE INCIDENT TO A HIGHER PLATEAU AS IF I HAD INDEED INFRINGED ON THE RWY RENDERING THAT TXWY USELESS FOR LNDG TFC. MY ERROR WAS NOT BEING MORE FAMILIAR WITH THE TXWYS AND THEIR DESIGNATIONS VIA THE ALPHA CALL SIGNS. IN ADDITION; I FEEL THAT THE CTLR WAS IN AN EASY POS TO GET 'TOO BUSY' AS TFC FLUCTUATED AND THE OTHER TFC WAS PENALIZED FOR IT OR BECAUSE OF THIS SIT.