Fisher MT-750 - FUNCTIONAL DESCRIPTION; MICROCOMPUTER PORTS AND FUNCTIONS

FUNCTIONAL DESCRIPTION
MICROCOMPUTER PORTS AND FUNCTIONS
INTRO LED ay TR-7 LED
TR-9 LED a TR-8 LED
Lift Down SW. ;
Lift Up SW. - Phono Motor
Speed
PBo~PB2 Arm Position
Arm Motor (left) ..ON
PCo~PC3 Key Scan Arm Motor (right) ..ON
PDo~PD3 Key Scan
Lifter Motor (down) ON
PEo TR-1 LED as Lifter Motor (up) ON
PE1 TR-2 LED “as Muting Relay ..ON
PE2 TR-3 LED ei Repeat ..ON
PE3 TR-4 LED
Reflector .. reflected
PFo TR-5 LED ae Back Pulse for Jeadin . OFF
PFi TR-6 LED ns Signal (sound) .. signaled
Xtal (1 EXtal
PCo [J 2 VDD (+5V}
PCi CJ3 PB3
Pc2 (4 PB2
Pc3(J5 PB1
iNT (6 PBo
RES(J7 PA3
PDo[]8 PA2
PD1[]9 PAI
PD2([]10 PAO
PD3(_J]11 Pl2
PEo(PLAo){_}12 Pit
PE1(PLA1) Pio
PE2(PLA2)(] 14 PH3
PE3(PLA3) (J 15 PH2
PFo(PLAa){_]16 PH1
PF1(PLA5){ 417 PHo
PF2(PLA6){_J18 PG3
PF3(PLA7)[_J19 PG2
TEST PG1
(OV) Vss ([] 21 PGo
-12-