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Old 14 February 2010, 00:33   #1
lost_lemming
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Mouse cursor problem

After fixing my a500. (dodgy IC pins seating) I have it going on now, turned on since about early 2000s. Annoying thing is, I've tried about 7 mouses (So i know it's not the mouses) I put it in Joystick1port (it doesn't do anything on port 2) and where ever I move the mouse it makes its way down to the bottom-right of the screen until you can't see it.

I can click the mouses buttons though. Any idea what is it? is it a dodgy port or is it yet another IC problem?

I might try and capture a video of it if you dont know what I mean by this.
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Old 14 February 2010, 01:18   #2
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Can be a CIA or Paula problem. Replace one at a time with another good ones from another A500.
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Old 14 February 2010, 02:08   #3
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Thank you very much for your quick reply. I will try and give that ago tomorow.

I love the people on this messageboard
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Old 14 February 2010, 10:31   #4
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Originally Posted by rkauer View Post
Can be a CIA or Paula problem. Replace one at a time with another good ones from another A500.
Why do you always have to repeat this incorrect information?

Mouse movement is handled by Denise. (+multiplexer TTL chip that selects between mouse ports, select signal also comes from Denise)

It is usually always the TTL chip or solder joint problem if another port works fine.
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Old 16 February 2010, 19:31   #5
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Quote:
Originally Posted by Toni Wilen View Post
Why do you always have to repeat this incorrect information?

Mouse movement is handled by Denise. (+multiplexer TTL chip that selects between mouse ports, select signal also comes from Denise)

It is usually always the TTL chip or solder joint problem if another port works fine.
Is this a removable chip? I couldn't find it anywhere, there's those 3 small ones sitting just by the end of the floppydrive?
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Old 17 February 2010, 01:03   #6
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just got back from work, i was kinda hoping some one had replied
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Old 17 February 2010, 09:00   #7
Toni Wilen
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Chip is marked as U20 (74<something>) and it most likely is soldered. (EDIT: not sure if my schematics are for early or late A2000s..)
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Old 17 February 2010, 09:33   #8
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Quote:
Originally Posted by Toni Wilen View Post
(EDIT: not sure if my schematics are for early or late A2000s..)
He talked about his A500... If they are different on that part, that is.
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Old 17 February 2010, 09:39   #9
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I read it as early A2000

A500 problem is usually always U15 (74LS157), soldered on PCB. Very common problem. (but replace socketed Denise first if you have spares, not that I have ever heard of Denise getting damaged that way)
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Old 17 February 2010, 21:19   #10
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problem fixed! finally, to cut a long story short, the multiplexer chip was okay. It was something on the board that got damaged. a damaged track to suply 5 Volts (I think) to the Clock TTL (under the Denise) if that clock chip isn't working, then the multiplexer chip doesn't operate.
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Old 24 February 2010, 13:35   #11
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ok problem's back, it's been back for a while now. EXCEPT, only the vertical axis works, but not the horizontal? after about 10 minutes, sometimes it will sort it's self out.
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Old 28 February 2010, 10:22   #12
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I had to say this, Try Cleaning the mouse!

Yea, i know im wrong. 7 mouses and all
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Old 01 March 2010, 18:33   #13
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^hehe

this is a funny one, it works now. I think it was the Denise/ECS all along, after getting a new 48 pin desise socket to replace the old bent one, the mouse problem has gone away!
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