Amiga 1200 Mouse Problems

kratam · 06 April 2016, 20:16

Good Evening,

Further problems persist with the Amiga 1200 that I have been modding to internally mount a gotek drive in (http://eab.abime.net/showthread.php?t=82256).

Now the mouse will not work, all I get is erratic movement as shown in the video at the link (http://vid1181.photobucket.com/album...403_163936.mp4). In the video I am moving the mouse quite a bit but as you can see it does not move much. The mouse buttons still work. I have also tested a second mouse that I know is working and that exhibits the same behaviour.

Could anyone tell me what that possible causes be and also a way to fix the problem?

Thanks.

Amiga1992 · 06 April 2016, 20:25

CIA problem? Have you recapped the motherboard?

nogginthenog · 06 April 2016, 20:28

Try portswit.lha on Aminet. It allows you to plug your mouse into the joystick port.
Worth a try, maybe your mouse is faulty!

kratam · 06 April 2016, 20:47

CIA problem? Have you recapped the motherboard?

I've not recapped the motherboard would you recommend that as a next step?

Also, what is a CIA problem, if there is one and how is that diagnosed/repaired?

kratam · 06 April 2016, 20:48

Quote:

Originally Posted by nogginthenog

Try portswit.lha on Aminet. It allows you to plug your mouse into the joystick port.
Worth a try, maybe your mouse is faulty!

I've tried two mice, both work on my Amiga 500.

Amiga1992 · 06 April 2016, 21:00

Yes you probably have to recap your unit if it hasn't yet, it's the first thing to suspect.

If after that it still doesn't work, maybe your CIA chip is fucked.

kratam · 06 April 2016, 21:26

Quote:

Originally Posted by Akira

Yes you probably have to recap your unit if it hasn't yet, it's the first thing to suspect.

If after that it still doesn't work, maybe your CIA chip is fucked.

I'll get some capacitors ordered online and recap it. If the CIA chip is fucked, is it repairable?

bebek · 06 April 2016, 22:29

I have neer seen caps causing the mouse problem (not electrolitic ones) but hey, it is remotely possible if Paula legs are covered with leak from caps, simple recap will not cure this problem. For mouse movement is responsible Paula not CIA.

If you need a repair drop me PM

.

Jope · 07 April 2016, 08:44

The CIA doesn't read mouse movement.

U34 (74SL166) encodes the movement to send to U4 (Lisa) which actually contains the mouse registers.

kratam · 07 April 2016, 16:17

Quote:

Originally Posted by Jope

The CIA doesn't read mouse movement.

U34 (74SL166) encodes the movement to send to U4 (Lisa) which actually contains the mouse registers.

I did a bit research on my lunch break. And found this on lemonamiga http://www.lemonamiga.com/forum/view...791ae893723558.

Could this be a possible avenue of investigation?

Arnie · 07 April 2016, 16:23

Wouldn't hurt to check and it wouldn't take long.
Have you ever removed or inserted the mouse while the Amiga is powered up?

bebek · 07 April 2016, 16:32

Quote:

Originally Posted by Jope

The CIA doesn't read mouse movement.

U34 (74SL166) encodes the movement to send to U4 (Lisa) which actually contains the mouse registers.

Brain fart and statement withdrawn

Jope · 07 April 2016, 16:54

Paula has the analogue inputs. http://old.pinouts.ru/Inputs/AmigaMouseJoy_pinout.shtml

Zetr0 · 07 April 2016, 17:28

@kratam

I would check the input cleaning of E363 and E364, its quite likely a dry solder joint - run a little bit of solder and flux and it should be good, however if you need to - for replacements you will need 470pF

I would also take the opportunity to check C313 and C314 to see if they are pulling the voltage down properly, again quiet likely a dry solder joint, so a little reflow is a good idea, however if need be - .047uF is the replacement value for these.

Amiga1992 · 07 April 2016, 17:57

Quote:

Originally Posted by Jope

Paula has the analogue inputs. http://old.pinouts.ru/Inputs/AmigaMouseJoy_pinout.shtml

Thanks for the clarification, I am a tit for suggesting CIA failure. I'm very sorry.
It seems, like with the C64 before, the chip in charge of reading analog inputs is again the one in charge of sound. Funny that. I learned a new thing today

Jope · 07 April 2016, 18:33

Analogue is rarely ever used on the Amiga, so there's not much talk about that. The Amiga mouse is not analogue. :-)

Amiga1992 · 07 April 2016, 19:07

I'm thoroughly confused now , then :P

kratam · 07 April 2016, 20:55

Quote:

Originally Posted by Arnie

Wouldn't hurt to check and it wouldn't take long.
Have you ever removed or inserted the mouse while the Amiga is powered up?

I've never removed or inserted the mouse while the Amiga is powered up.

bebek · 07 April 2016, 21:02

How does it move in early boot menu?

Jope · 07 April 2016, 22:19

Quote:

Originally Posted by Akira

I'm thoroughly confused now , then :P

No need to be, http://eab.abime.net/showpost.php?p=1082422&postcount=9 is still true.

06 April 2016, 20:16	#1
kratam Registered User Join Date: May 2005 Location: Huddersfield Age: 42 Posts: 44	Amiga 1200 Mouse Problems Good Evening, Further problems persist with the Amiga 1200 that I have been modding to internally mount a gotek drive in (http://eab.abime.net/showthread.php?t=82256). Now the mouse will not work, all I get is erratic movement as shown in the video at the link (http://vid1181.photobucket.com/album...403_163936.mp4). In the video I am moving the mouse quite a bit but as you can see it does not move much. The mouse buttons still work. I have also tested a second mouse that I know is working and that exhibits the same behaviour. Could anyone tell me what that possible causes be and also a way to fix the problem? Thanks.

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06 April 2016, 20:25	#2
Amiga1992 Registered User Join Date: May 2001 Location: ? Posts: 19,645	CIA problem? Have you recapped the motherboard?

06 April 2016, 20:28	#3
nogginthenog Amigan Join Date: Feb 2012 Location: London Posts: 1,311	Try portswit.lha on Aminet. It allows you to plug your mouse into the joystick port. Worth a try, maybe your mouse is faulty!

06 April 2016, 20:47	#4
kratam Registered User Join Date: May 2005 Location: Huddersfield Age: 42 Posts: 44	CIA problem? Have you recapped the motherboard? I've not recapped the motherboard would you recommend that as a next step? Also, what is a CIA problem, if there is one and how is that diagnosed/repaired?

06 April 2016, 21:00	#6
Amiga1992 Registered User Join Date: May 2001 Location: ? Posts: 19,645	Yes you probably have to recap your unit if it hasn't yet, it's the first thing to suspect. If after that it still doesn't work, maybe your CIA chip is fucked.

06 April 2016, 22:29	#8
bebek Registered User Join Date: Dec 2009 Location: Poole UK Posts: 349	I have neer seen caps causing the mouse problem (not electrolitic ones) but hey, it is remotely possible if Paula legs are covered with leak from caps, simple recap will not cure this problem. For mouse movement is responsible Paula not CIA. If you need a repair drop me PM .

07 April 2016, 08:44	#9
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	The CIA doesn't read mouse movement. U34 (74SL166) encodes the movement to send to U4 (Lisa) which actually contains the mouse registers.

07 April 2016, 16:23	#11
Arnie R.I.P Smudge 18-08-16 Join Date: Aug 2005 Location: Leicester/UK Age: 66 Posts: 3,968	Wouldn't hurt to check and it wouldn't take long. Have you ever removed or inserted the mouse while the Amiga is powered up?

07 April 2016, 16:54	#13
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	Paula has the analogue inputs. http://old.pinouts.ru/Inputs/AmigaMouseJoy_pinout.shtml

07 April 2016, 17:28	#14
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	@kratam I would check the input cleaning of E363 and E364, its quite likely a dry solder joint - run a little bit of solder and flux and it should be good, however if you need to - for replacements you will need 470pF I would also take the opportunity to check C313 and C314 to see if they are pulling the voltage down properly, again quiet likely a dry solder joint, so a little reflow is a good idea, however if need be - .047uF is the replacement value for these.

07 April 2016, 18:33	#16
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	Analogue is rarely ever used on the Amiga, so there's not much talk about that. The Amiga mouse is not analogue. :-)

07 April 2016, 19:07	#17
Amiga1992 Registered User Join Date: May 2001 Location: ? Posts: 19,645	I'm thoroughly confused now , then :P

07 April 2016, 21:02	#19
bebek Registered User Join Date: Dec 2009 Location: Poole UK Posts: 349	How does it move in early boot menu?

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