Pinouts for the UC1147 CPU in the Uniden BC200xlt scanner.... Note: ! means "not," If a pin does not have a designation, its destination is given. Ex. "Gnd" means the pin is designated "Gnd" but "to Gnd" means the pins was unlabeled but connected to ground. This info comes from my reading the schematic from the service manual--sorry for any errors! Pin Pin 1 CL1 (Keypad) 33 !CS1 2 CL3 (Keypad) 34 !CS2 3 CL4 (Keypad) 35 to Gnd 4 CL5 (Keypad) 36 to Gnd 5 CL6 (Keypad) 37 to Gnd 6 to VCC 38 to Gnd 7 to VCC 39 to Gnd 8 RW1 (Keypad) 40 to Gnd 9 RW2 (Keypad) 41 !SKIP (to Gnd via R(10k) 10 RW3 (Keypad) 42 to Gnd 11 RW4 (Keypad) 43 RESET 12 to VCC 44 !TEST 13 to Gnd 45 OSC1 14 to Gnd 46 OSC2 15 to Gnd via R(unknown) 47 GND 16 !HLT 48 !BL 17 to Gnd 49 SC 18 to Gnd via R(unknown) 50 !800 19 to Gnd via R(unknown) 51 !UHF (assumed) 20 to Gnd 52 AIR 21 !BUSY 53 VHI 22 !RST 54 VLO 23 !C/D 55 n/c 24 !CS 56 SHIFT 25 VLC3 57 n/c 26 VCC 58 MUTE 27 !SCK 59 !P/OFF 28 SI 60 to VCC 29 SC 61 to VCC 30 PLLEN 62 to VCC 31 !EN1 63 LIGHT 32 !EN2 64 CL2 (assumed) (keypad) R(unknown) values were not listed on the schematic or in the parts list. (assumed) labels are based on the implications of other labels on the schematic. 15, 18, and 19 look like they could be interesting.... And 41 should be interesting to people who don't want their scanner to "skip" certain frequency ranges.... OSC1 and OSC2 are the feed in for the 400mhz oscillator. This oscillator can be replaced with a faster one to increase the scan/search speed...but it will also decrease your light on-time... And as far as keeping the light on all the time...one could connect a switch to the LIGHT pin and a VCC. When off, it would function as normal. When on, the light would go on and off with the power. Watch out for short circuits if you do this...I fried a transistor on mine when I had a VCC to Gnd short.... Happy hacking! Brett brett@surfpix.princeton.edu