Welcome, Guest. Please login or register.

Author Topic: Almost got it, but now a sticky mouse on A500?  (Read 2117 times)

Description:

0 Members and 1 Guest are viewing this topic.

Offline ferix

  • Full Member
  • ***
  • Join Date: Aug 2009
  • Posts: 136
    • Show all replies
Re: Almost got it, but now a sticky mouse on A500?
« on: November 09, 2010, 12:51:06 PM »
Follow these steps (if one fails, continue to the next):

1. Check power. A faulty 5v line can get your A500 crazy.
2. Reseat de CIA (the one that is close to the joystick and mouse ports).
3. Swap the CIAs
4. Reseat DENISE chip (It, or she, drives the mouse signals).
5. Replace EMI400 and EMI401 (check value on schematics, It changes from version to version).
6. Replace the 74LS157 chip (U15?)

If your mouse buttons work well, you can skip steps 2 an 3.
I bet It's the 74LS157

Good luck!!!
« Last Edit: November 09, 2010, 01:00:14 PM by ferix »
[Master of puppets I\'m pulling your strings  
Twisting your mind and smashing your dreams  
Blinded by me, you can\'t see a thing  
Just call my name, \'cause I\'ll hear you scream]
...
We are The Borg.
Lower your shields and surrender your ships.
We will add your biological and technological distinctiveness to our own.
Your culture will adapt to service us.
Resistance is Futile.

 

Offline ferix

  • Full Member
  • ***
  • Join Date: Aug 2009
  • Posts: 136
    • Show all replies
Re: Almost got it, but now a sticky mouse on A500?
« Reply #1 on: November 10, 2010, 12:30:44 PM »
Quote
I will give the DENISE a reseat next since I have a PLCC tool around here somewhere.

AFAIK DENISE has DIL packaging on A500, not PLCC...
Only AGNUS has PLCC packaging, and It (or she) has nothing to do with the mouse or joystick.
[Master of puppets I\'m pulling your strings  
Twisting your mind and smashing your dreams  
Blinded by me, you can\'t see a thing  
Just call my name, \'cause I\'ll hear you scream]
...
We are The Borg.
Lower your shields and surrender your ships.
We will add your biological and technological distinctiveness to our own.
Your culture will adapt to service us.
Resistance is Futile.

 

Offline ferix

  • Full Member
  • ***
  • Join Date: Aug 2009
  • Posts: 136
    • Show all replies
Re: Almost got it, but now a sticky mouse on A500?
« Reply #2 on: November 10, 2010, 04:57:21 PM »
Quote from: hoptoit;590735
[..] no change in the mouse behavior.

Next logical step is to replace EMI400 and EMI401, but I'm pretty sure the problem is U15 (74LS157).
[Master of puppets I\'m pulling your strings  
Twisting your mind and smashing your dreams  
Blinded by me, you can\'t see a thing  
Just call my name, \'cause I\'ll hear you scream]
...
We are The Borg.
Lower your shields and surrender your ships.
We will add your biological and technological distinctiveness to our own.
Your culture will adapt to service us.
Resistance is Futile.