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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: onemaddude on May 25, 2011, 11:56:03 AM

Title: Mouse & floppy problems on A500
Post by: onemaddude on May 25, 2011, 11:56:03 AM: Can anyone help with my problems

Mouse
One of my A500s (rev 6 board)
move the mouse in any direction and it goes down and right - no up or left
i have tried two mice with the same problem.

The mice work fine on another A500

Floppy
Same A500 put in a disk eg "Workbench" and after much clicking as if loading tell mes the disk is "Not a DOS disk" but use an old demo etc which isn't a standard disk format and it will load it happily.
I can use an external to load the same DOS disk so dont think its the disk

Can anyone help/advise
Title: Re: Mouse & floppy problems on A500
Post by: lost_loven on May 25, 2011, 12:08:15 PM: try swapping around the cia chips and see what that does.

lost
Title: Re: Mouse & floppy problems on A500
Post by: onemaddude on May 26, 2011, 01:01:14 PM: Tried that no joy
on the good news side I have got it working with a serial mouse
Thanks for the idea - I thought that was only for serial/printer problems
Title: Re: Mouse & floppy problems on A500
Post by: lost_loven on May 26, 2011, 10:12:58 PM: The cia chip's (one of them) does help with mouse joystick control and floppy. I think maybe paula chip ( i could be wrong, maybe gary) has some thing to do with floppy as well as sound. try swapping that too!

lost
Title: Re: Mouse & floppy problems on A500
Post by: lost_loven on May 26, 2011, 10:36:30 PM: http://en.wikipedia.org/wiki/Amiga_custom_chips
good reading on chips and links to chip sets and functions!

lost
Title: Re: Mouse & floppy problems on A500
Post by: mongo on May 27, 2011, 01:35:44 AM: Quote from: onemaddude;640146
Can anyone help with my problems

Mouse
One of my A500s (rev 6 board)
move the mouse in any direction and it goes down and right - no up or left
i have tried two mice with the same problem.

The mice work fine on another A500

Floppy
Same A500 put in a disk eg "Workbench" and after much clicking as if loading tell mes the disk is "Not a DOS disk" but use an old demo etc which isn't a standard disk format and it will load it happily.
I can use an external to load the same DOS disk so dont think its the disk

Can anyone help/advise

The mouse problem could be caused by U15. It's a 74ls157. It could be bad, or there might be a problem with the connection between pin 4 on U33 and pin 1 on U15.

The floppy problem is most likely a dirty or dying drive.
Title: Re: Mouse & floppy problems on A500
Post by: onemaddude on May 27, 2011, 09:18:29 AM: OK will give them a try later
Title: Re: Mouse & floppy problems on A500
Post by: onemaddude on May 27, 2011, 01:06:16 PM: still no joy looks like i will have to either find another serial mouse driver or register the one i have.