SE/30 mouse issue.

[crazyben]

My recapped SE/30 is having weird mouse issue. The cursor won’t move. It does register click. I tired connecting through keyboard or straight to adb port no effects. Keyboard works as expected. When I tested on LC3 keyboard and mouse both work. This was working on SE/30 recently until i decided I wanted to upgrade the RAM. Any idea on what might be going on here?

 

[croissantking]

My recapped SE/30 is having weird mouse issue. The cursor won’t move. It does register click. I tired connecting through keyboard or straight to adb port no effects. Keyboard works as expected. When I tested on LC3 keyboard and mouse both work. This was working on SE/30 recently until i decided I wanted to upgrade the RAM. Any idea on what might be going on here?

Could be an issue with a VIA or the ADB chip

 

[bibilit]

If the click is registered, maybe just a bad trace, the chip is probably OK

 

[giolicious]

Try running your Mac without extensions by holding the shift key when booting.

 

[joshc]

Is the whole machine freezing or just the cursor movement? This could be nothing to do with the mouse or ADB at all. Have you tested the voltages from the power supply?

 

[zigzagjoe]

Definitely roll back any recent changes you've made and try a different disk image. Also PRAM reset, etc. If the issue persists them you've got an issue that's preventing the VSync interrupt from firing which is most likely trouble with a VIA.

 

[cheesestraws]

Agreed; before you take anything apart, boot from a new disc image to check it isn't a software issue (there are multiple ways that software can cause this behaviour). There are few things more annoying than dismantling a machine completely for what turns out to be a software issue

 

[crazyben]

I will try with new disk image as only cursor is frozen. I did roll back the RAM upgrade.

 

[zigzagjoe]

realistically you don't even need a disk image: the cursor should move at the blinking question mark icon. if it doesn't, even with pram reset, it's a hardware issue.

 

[crazyben]

No change after PRAM reset. Do I need to the rule out the PRAM battery too?

 

[zigzagjoe]

the PRAM battery is a super long shot that was not expected to do much.

if the issue persists and you've taken the board down to minimums (no drives, no battery, a standard ROM module, 4 sticks of RAM, nothing but a mouse externally) then you've got an issue with the board I'm afraid.

 

[crazyben]

Let me try to do barebones like you suggest and see what happens. Is this chip only found in se/30 board I can source from another if needed?

 

[zigzagjoe]

you are more likely to have a corroded or bridged connection, cut trace, or similar rather than a bad chip.

generically all we can say right now is it appears that the vsync interrupt isn't firing, it ought to be a ~60hz signal going into one of the VIA inputs. Not entirely sure how it's managed without digging into things though

 

[crazyben]

Sounds good. I will take a board out and inspect it.

 

[crazyben]

So i realized that i missed a big detail to include about my SE/30. I have xceed micron card with neck board installed on this. Just to rule out if that has anything to do with it I swapped the board to another SE/30 and the mouse works.

I did recap the PSU and logic board. Before I installed the xceed card. Do I need to recap the analog board too. Maybe that is the culprit?

 

[Arbee]

Check continuity on the PDS interrupt pins back to, I believe, VIA2. The Xceed card's interrupts aren't being received. Nothing to do with the analog board.

 

[crazyben]

Check continuity on the PDS interrupt pins back to, I believe, VIA2. The Xceed card's interrupts aren't being received. Nothing to do with the analog board.

can you guide me where that would be?

 

[clopes66]

Hi!
I had exactly that symptom some months ago. Suddenly, the mouse was stuck but everything else worked. Clicking was functional and the ADB keyboard also worked. I was getting nowhere until I tested with a different analog board (w/ PSU replaced by a mini ATX). It started to work!

I reinstalled the original analog board and rechecked voltages. All voltages appeared to be in acceptable ranges but the problem with the mouse reappeared. I am using the alternative analog board (with mini ATX PSU) since then. The original analog board and PSU might need recapping (which haven't done yet).

 

[Arbee]

can you guide me where that would be?

Yes. I've attached the SE/30 schematic. The first page has the PDS slot. Pins 4, 44, and 84 are the 3 Interrupt ReQuests (IRQs). Slot pin 84 (IRQ1) should have continuity to pin 2 of the chip at UK11 (page 4 of the PDF). Pin 44 (IRQ2) should have continuity to pin 3 of UK11, and pin 4 on the slot should have continuity to pin 4 of UK11.

 

[crazyben]

Hi!
I had exactly that symptom some months ago. Suddenly, the mouse was stuck but everything else worked. Clicking was functional and the ADB keyboard also worked. I was getting nowhere until I tested with a different analog board (w/ PSU replaced by a mini ATX). It started to work!

I reinstalled the original analog board and rechecked voltages. All voltages appeared to be in acceptable ranges but the problem with the mouse reappeared. I am using the alternative analog board (with mini ATX PSU) since then. The original analog board and PSU might need recapping (which haven't done yet).

Oh wow. I have recapped the PSU but not the analog board. i can try switching the PSU and see if the help. i need to look into mini ATX PSU.