Mouse doesn't work on first port

[RiP]

My Amiga 2000's mouse doesn't work on the first/right port.
Even its buttons don't work but no problem with the second/left port.
Joystick works on both ports though. Anyway to fix it? It's B2000 rev. 6
I have even swapped those two CIA chips but made no difference
http://phota.me/FA23.jpg

[Oldsmobile_Mike]

Did you read through everything in this thread?

http://www.amiga.org/forums/showthread.php?t=56078

[RiP]

Yes, but I have different problem.

[guest11527]

I have even swapped those two CIA chips but made no difference

Unlike common believe, the CIAs are *not* responsible for the mouse pointer.

If the mouse buttons work, but the mouse does not move at all, then this looks for the A2K as if there is no +5V on the first mouse port. This voltage is needed for driving the LEDs in the mice illuminating the position sensor.

Had you checked the battery for leakage? The mouse logic is close to the RTC unit and prone to leakage after so many years.

[RiP]

I said even the mouse buttons don't work but no problem with the second/left port.
Joystick works on both ports though.

[CodePoet]

Hi,

That isn't a picture of your mainboard (it's from BBOAH) - Thomas is right, it looks like the 5v rail may be hosed.

If you have a multimeter, check between Pin 7 and Pin 8 of both of the ports and see what you get. If joysticks work perfectly on both ports, you can pretty much rule out U202 and the pull-up resistor packs

Here's a link to the schematic, the joyports are on the lower left of page 3: http://www.amigawiki.de/dnl/schematics/A2000_R6.pdf

[RiP]

5V is OK on both ports.

[RiP]

Hi,

That isn't a picture of your mainboard (it's from BBOAH

Here's mine. I swapped those two, dunno exactly if those are CIA or not:

http://phota.me/vwjf.jpg

[CodePoet]

Have you tried removing and re-seating Denise (U201)? The M0V and M0H signals eventually end up on pin 38 and pin 9 of Denise respectively.

Here's a list of parts that /could/ be suspect, starting at the signal side (joystick port):

Pull-up resistor pack RP200 (bottom left)
Pull-down resistor pack RP205 (bottom left)
Feed resistor pack RP204 (bottom left)
Quad multiplexer U202 (bottom left)
Denise IC U201 (bottom middle)

It's a bit odd that both joysticks work perfectly, though. If you have an oscilloscope, you could try looking for a pulsetrain at pin 38 and pin 9 of Denise (while moving the mouse plugged into port one), and comparing it to pins 9 and 12 of U202 to check if there is a break in the signal path between both ICs

[Oldsmobile_Mike]

Here's mine. I swapped those two, dunno exactly if those are CIA or not:

http://phota.me/vwjf.jpg

Gah. Get that old Varta battery out of there, asap.

[RiP]

Have you tried removing and re-seating Denise (U201)? The M0V and M0H signals eventually end up on pin 38 and pin 9 of Denise respectively.

Here's a list of parts that /could/ be suspect, starting at the signal side (joystick port):

Pull-up resistor pack RP200 (bottom left)
Pull-down resistor pack RP205 (bottom left)
Feed resistor pack RP204 (bottom left)
Quad multiplexer U202 (bottom left)
Denise IC U201 (bottom middle)

It's a bit odd that both joysticks work perfectly, though. If you have an oscilloscope, you could try looking for a pulsetrain at pin 38 and pin 9 of Denise (while moving the mouse plugged into port one), and comparing it to pins 9 and 12 of U202 to check if there is a break in the signal path between both ICs

I'll try re-seating Denise but fear of de-soldering the rest.
What's the best way to re-seat those ICs?

Gah. Get that old Varta battery out of there, asap.

I know but I fear of de-soldering
Can I replace it with lithium battery or else?

[Oldsmobile_Mike]

I know but I fear of de-soldering
Can I replace it with lithium battery or else?

AmigaKit and others sell coin cell conversion kits for just a few bucks, or you can make your own with commonly available bits (errr, they used to be commonly available, back when Radio Shack was still around).  But you don't have to replace it right away, just rock it back & forth a bit till it snaps out.  That'll solve at least one potential issue with your machine!  

[RiP]

Still fear of de-soldering lol

Found two new things that might help:
1. When I load/boot IK+ from floppy, I should press the joystick/mouse button of the left port to continue.
Pressing the joystick button of the right port won't let me to continue to play the game.
After that, I can play the game with both joysticks though.
2. The left port has stronger/sturdy pins than the right board, doesn't bend at all.

[Oldsmobile_Mike]

Still fear of de-soldering lol

Considering the range of issues you're having, perhaps you should consider buying a replacement motherboard that's already been tested? Or sending yours to someone with skill working on these kinds of components (Acill on this forum comes to mind).  Otherwise you're just going to have to get your hands dirty, I'm afraid.  :lol:

[Oldsmobile_Mike]

One other quick thought - I just went back and looked at the picture you posted earlier.  It looks like you have some kind of ROM switcher installed?  Have you tried removing all expansions from the system and testing your mouse & serial port issues with everything removed?

(you should really, really clean up around that battery, and snip it out of there, btw)