Re: TI-H: Someone please help

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: Someone please help
From: "Richard Piotter" <richfiles1@hotmail.com>
Date: Thu, 12 Mar 1998 12:32:15 PST
Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: ti-hardware@lists.ticalc.org

>As I was turboing a TI-85, my brother walking in silently, and scared 
the
>living cr*p out of me.  My soldering iron slipped and burnt the board!  
It
>only destroyed the thicker trace that goes under C9, right next to the 
blank
>pin on the chip, and runs to the display.  I soldered it back on w/ a 
wire.
>Then I beat up my brother :---)  For C9, I couldn't figure out which 
wires
>to put where.  When I finally though I had it right, I turned it on.  
There
>were random horizontal lines on the screen.  Can someone please help 
me?  I
>don't want to pay (or make my brother pay) for a new one, because this 
isn't
>mine.  If it comes down to that, I guess I have no choice, but I'd 
rather
>fix it first.

Well, first make sure no solder is shorting any wires. Next, use a multi 
meter to check that the bottom side of R11 connects to the 10th pin on 
the processor. If it does NOT connect, then solder a wire between pin 10 
and R11 and then connect C9 to the top connection of C9. Connect a wire 
to the other wire at the bottom of R11 and another wire to the 
unconnected side of C9. Those 2 wires lead to a switch, to allow normal 
or turbo speed to be selected.

Normal schematic

                         \ \  |
    Ground___o__________  | |_|Display line 2
             |          | |   |
      _______|______    | |___|Display line 1
    _|_     _|_     |   |     |
   |   |   |   |    |   |   __|No Connection
   |R11|   | C9|    |   |     |
   |___|   |___|    |   |_____|Ground  (9th  pin)
     |       |      |         |
     |_______o______|_________|OSC1    (10th pin)
                    |         |
                    |_________|OSC2    (11th pin)
                              |

Turboed schematic


                         \ \  |
    Ground___o__________  | |_|Display line 2
             |          | |   |
      _______|______    | |___|Display line 1
    _|_     _|_     |   |     |
   |   |   |   |    |   |   __|No Connection
   |R11|   | C9|    |   |     |
   |___|   |___|    |   |_____|Ground  (9th  pin)
     |       o--.   |         |
     |______   __|__|_________|OSC1    (10th pin)
            `o'  |  |         |
             |   |  |_________|OSC2    (11th pin)
             |   |            |
             |___|
            |     |
            |_____|  Switch
               |_|

Just make sure the circuit board's connections match. Also, make sure 
solder didn't splash on other parts. I'm fixing someones calc now and it 
loks like the soldering iron was dropped on it! It has a MASSIVE glob 
shorting the RAM chip and another on the ROM chip! I'll need to get my 
desoldering iron out its such a big glob!!!

Just be careful, and beat the cr*p out of your little bro or whoever it 
was! (;

PS. Super Mario Brothers 1, 2, & 3 are pretty cool on a Mac! Has anyone 
tried making a DECENT asm port of any version to a TI. even just a good 
world or two!

And what ever happened to andreas Ess's home page. Where is it??? and 
has he ever made an update to Daedalus???

Thanks!

Richard Piotter
richfiles1@hotmail.com

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