INSTALLATION OF THE KENMORE Z-TIMECLOCK IN AN NORTHSTAR ADVANTAGE 


BOB KOLLER                                       SEP 17, 1986
SYSOP, TUG-NET 
FOG AMO 106
818-882-6045 RBBS

BACKGROUND-

IN THE ADVANTAGE, THE KENMORE BASE MEMORY ADDRESS (0E0H) IS USED
FOR THE FLOPPY DRIVES; THEREFORE, A SUITABLE ALTERNATIVE HAD TO BE FOUND.

ALSO, THE KENMORE BOARD WILL NOT PHYSICALLY FIT IN THE Z-80 SOCKET
WITHOUT THE USE OF AN UMBILICAL CABLE. A MOUNTING LOCATION HAD TO BE
LOCATED; A SHIELD WAS NEEDED TO PREVENT INTERFERENCE FROM THE CRT
CIRCUITRY DIRECTLY ABOVE.

MEMORY ADDRESS-

AFTER CONSULTING THE TECHNICAL MANUAL AND CONFERRING WITH DON APPLEBY
(BANKERS & HACKERS RBBS), IT WAS DECIDED TO TRY 040H. THIS ADDRESS
IS THE NUMBER 2 I/O SLOT. TO EFFECT THIS CHANGE, YOU MUST CUT THE
CIRCUIT JUMPER ON THE Z-TIME BOARD AT E0. THEN, CONNECT A JUMPER
AT 40 ON THE Z-TIME. 

NOTE THAT ON SOME Z-TIME BOARDS THE ADDRESS JUMPERS ARE INCORRECTLY
LABELED ie, 04, 05 06, RATHER THAN 40, 50 ,60 , ETC..

ALSO THE SOFTWARE USED TO SET AND READ THE CLOCK MUST HAVE ITS
BASE MEMORY ADDRESS RESET TO 040H.

PHYSICAL INSTALLATION-

REMOVE THE SIO BOARD FROM SLOT 2. REINSTALL IN SLOT 3, OR WHATEVER
IS APPROPRIAT FOR YOUR SETUP....

BASICALLY, THE Z-TIME FITS, UPSIDE DOWN, OVER THE MEMORY CHIPS, ON
ITS SHIELD. AS FOLLOWS:

                               ^
                          REAR OF ADV

	     H
             D
                        I/O SLOTS 

             ^     ^    ^     ^     ^     ^

                        ^

 	    	    __________________________*******
                    /|                         *     *
                   / |                         *     *
                  /  |                         * Z80 *
                 /   |                         *     *
                /    |                         *     *
               /     |                         *     *
              |_______________________________ *******
              |      |
              |      |
              |      |
              |      |
              |      |          TOTAL CABLE LENGTH ABOUT 6"
              |      |
              |      |
     _______________________
     |                     |
     |                     |
     |                     |
     |     Z-TIME          |
     |                     |
     |     UPSIDE          |
     |     DOWN            |
     |                     |
     |                     | 
     |                     |
     ______________________


I MADE A COPPER FOIL SHIELD LARGE ENOUGH TO  FIT UNDER THE Z-TIME AND  CABLE
AND TO FOLD OVER THE TOP OF THE Z-TIME AND CABLE. I COMPLETELY INSULATED THE
FOIL TO PREVENT ANY SHORTS. THIS IS CRITICAL!!!!!!! IF YOU HAVE ANY!! BARE
COPPER YOU COULD CAUSE PERMANENT DAMAGE!!!!! I SOLDERED A GROUND WIRE FROM
A CORNER OF THE FOIL TO THE SIO BOARD GROUND TRACE.

OPERATION-

I USE ZTIM.COM TO SET THE CLOCK. IT ASKS FOR THE BASE ADDRESS.
I MODIFIED MDATE.BAS TO USE 040H AS ITS BASE TO CHECK THE TIME.

FOR BYE5 USE; THE B5-KCT.INS WORKS FINE WITH ITS BASE SET TO 040H.

FOR VARIOUS BBS PROGRAMS THE READER WILL HAVE TO MAKE ADJUSTMENTS.

LASTLY; I REALLY DON'T RECOMMEND THIS MODIFICATION FOR SOMEONE 
INEXPERIENCED PERFORMING ELECTRONIC SURGERY... THERE IS SOME POTENTIAL
FOR PROBLEMS IF CARE IS NOT EXCERCISED......