Re: IIGS clock -- which chip is it?

[buggie@ben14.unm.edu (stephen e buggie)]

Taking David Wilson's advice, I measured voltages on the no-slot-clock and
found 1.5 volts between the two points on the ASCII art of the chip, shown
below:



  28-pin wide   __________________________________________________________
     chip       |                                                        |
                |                                                        |
  No-SLOT       |                                                        |
  CLOCK         |                                                        |
                |               _|___|____|____|____|___|___|____|_      |
        notch   \               |                                 |      |
                /               \                                 |      |
                |               /     DALLAS  DS1216              |      |
                |    O      O   |                                 |      |
                |               |_________________________________|      |
voltage:        |                |   |    |    |    |   |   |    |       |
 1.5 volts DC   |    O      O                                            |
                |  * neg                       * pos                     |
                |________________________________________________________|



The "bad" NSC even shows 1.3 volts beteen the two points, so I will try
that unit on a diofferent IIe before getting involved in soldering tiny
wires.

What 1.5 volt battery is recommended???  Lithium is always 3 volts, right?
How about an AG-13 calculator battery???  Should it be a ni-cad
rechargeable battery????
Thanks David Wilson for your advice.

Bye, Steve.


 **=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=**
 ** Stephen Buggie  UNM-Gallup,  200 College Road,      Gallup NM 87301 **
 ** buggie@unm.edu      IIgs/IIc/IIe  voice: (505) 863-2390 or 863-7504 **
 **               Apple ][ Forever ---- the "trailing edge"!            **
 **=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=**








stephen e buggie (buggie@ben03.unm.edu) wrote:
: 		REPLACEMENT OF CLOCK CHIP ON IIGS MOTHERBOARD
:                 =============================================


: One of my IIgs computers has a jammed clock!  I replaced the battery ---
: still doesn't advance the clock.  The control panel settings remain
: stable, so I deduce that the clock is bad.

: WHICH IC CHIP IS THE CLOCK?  I also have a scrapped IIgs motherboard from
: which I might desolder the clock, and fit it into the working GS
: motherboard.

: BTW, If the chip is a surface-mounted part, I'll try copper desioldering
: braid to remove it.  But if anyone else has worked with surface-mounted
: components, any help on soldering techniques will be appreciated!   I
: receive the magazine, SURFACE MOUNT TECHNOLOGY, but its all manufacturing
: topics --- nothing for hardware hackers..... 8-(    Steve Buggie


:   Stephen Buggie                                  |Sorry sir, "APPLE II |
:   Psychology Dept.                                |  FOR DUMMIES"  was  |
:   Univ. of New Mexico, Gallup                     |   never published;  |
:   200 College Rd.                                 |could you get the IBM|
:   Gallup, NM  87301                               |   version instead?  |
:  **=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=**
:  ** buggie@unm.edu                    voice: (505) 863-7504 or 863-2390 **
:  **              Apple IIgs/IIe/IIe;  Mac SE/Classic                    **
:  **=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=**