DISK DRIVE PORT (FLOPPY)

       CONNECTION TYPE: DB23 FEMALE (EXTERNAL)

       PIN     NAME       I/O       DESCRIPTION
       ----------------------------------------------------------------------------
       1       /RDY       I/O       DISK READY
       2       /DKRD      I         DISK READ DATA
       3-7     GND        -         EARTH
       8       /MTRXD     OC*       DISK MOTOR CONTROL
       9       /SEL2      OC*       SELECT DRIVE 2
       10      /DRES      OC*       DISK RESET
       11      /CHNG      I/O       DISK REMOVED FROM DRIVE--LATCHED LOW
       12      +5V        -         +5 VOLTS DC (250 mA MAXIMUM)
       13      /SIDE      O         SELECT DISK SIDE--0=UPPER, 1=LOWER
       14      /WPRO      I/O       DISK IS WRITE PROTECTED
       15      /TKO       I/O       DRIVE HEAD POSITION OVER TRACK 0
       16      /DKWE      OC*       DISK WRITE ENABLE
       17      /DKWD      OC*       DISK WRITE DATA
       18      /STEP      OC*       STEP THE HEAD--PULSE, FIRST LOW, THEN HIGH
       19      DIR        OC*       SELECT HEAD DIRECTION--0=LNNER, 1=OUTER
       20      /SEL3      OC*       SELECT DRIVE 3
       21      /SELL      OC*       SELECT DRIVE 1
       22      /INDEX     I/O       DISK INDEX PULSE
       23      +12V       -         +12 VOLTS DC (160 mA MAX.)

       OC=OPEN COLLECTOR

       COMPILED & WRITTEN BY PAUL ANDREWS JR