Mark, It makes everything much easier with the right tools: Download MPLAB from microchip.com you can use names for all your jump locations, file registers etc. check out the *.inc files after downloading MPLAB, they contain register names etc for each processor. Also you will find example files. Your code listing will look ancient after doing this. regards, Graham Daniel. Marc D. Spencer wrote: > > What am I doing wrong? this should be the simplest start...turn all port b > pins on. > > Code: > > 0000 MOVLW 00 > MOVWF 0A > GOTO 005 > NOP > NOP > 0005 CLRF 04 > CLRF 03 > MOVLW 07 > MOVWF 1F > 0009 BSF 03,5 > CLRF 06 > MOVLW FF > BCF 03,5 > MOVWF 06 > GOTO 009 > > Using a 16C622, wired trivially: > > pin 4 1K to Vcc, .1uF to Gnd > pin 5 gnd > pin 14 to TTL clock module, 10MHz > pin 12 to +5 > > looking at pins 6-13...all have about .25 v on them, but won't sink an LED > (with 1K res). > > Help? > > (I don't have a scope, but im pretty sure the power is clean - 7805 with > appropriate filtering off a wall wart)