Mouse cursor problem

lost_lemming · 13 February 2010, 23:33

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.

rkauer · 14 February 2010, 00:18

Can be a CIA or Paula problem. Replace one at a time with another good ones from another A500.

lost_lemming · 14 February 2010, 01:08

Thank you very much for your quick reply. I will try and give that ago tomorow.

I love the people on this messageboard

Toni Wilen · 14 February 2010, 09:31

Quote:

Originally Posted by rkauer

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.

lost_lemming · 16 February 2010, 18:31

Quote:

Originally Posted by Toni Wilen

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?

lost_lemming · 17 February 2010, 00:03

just got back from work, i was kinda hoping some one had replied

Toni Wilen · 17 February 2010, 08:00

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..)

8bitbubsy · 17 February 2010, 08:33

Quote:

Originally Posted by Toni Wilen

(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.

Toni Wilen · 17 February 2010, 08:39

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)

lost_lemming · 17 February 2010, 20:19

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.

lost_lemming · 24 February 2010, 12:35

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.

Dimlow · 28 February 2010, 09:22

I had to say this, Try Cleaning the mouse!

Yea, i know im wrong. 7 mouses and all

lost_lemming · 01 March 2010, 17:33

^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!

13 February 2010, 23:33	#1
lost_lemming Registered User Join Date: Aug 2009 Location: Birmingham Age: 38 Posts: 391	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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14 February 2010, 00:18	#2
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 58 Posts: 3,482	Can be a CIA or Paula problem. Replace one at a time with another good ones from another A500.

14 February 2010, 01:08	#3
lost_lemming Registered User Join Date: Aug 2009 Location: Birmingham Age: 38 Posts: 391	Thank you very much for your quick reply. I will try and give that ago tomorow. I love the people on this messageboard

17 February 2010, 00:03	#6
lost_lemming Registered User Join Date: Aug 2009 Location: Birmingham Age: 38 Posts: 391	just got back from work, i was kinda hoping some one had replied

17 February 2010, 08:00	#7
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,505	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..)

17 February 2010, 08:39	#9
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,505	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)

17 February 2010, 20:19	#10
lost_lemming Registered User Join Date: Aug 2009 Location: Birmingham Age: 38 Posts: 391	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.

24 February 2010, 12:35	#11
lost_lemming Registered User Join Date: Aug 2009 Location: Birmingham Age: 38 Posts: 391	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.

28 February 2010, 09:22	#12
Dimlow Likes to be thought of as Join Date: May 2008 Location: Kent,UK Age: 55 Posts: 529	I had to say this, Try Cleaning the mouse! Yea, i know im wrong. 7 mouses and all

01 March 2010, 17:33	#13
lost_lemming Registered User Join Date: Aug 2009 Location: Birmingham Age: 38 Posts: 391	^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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