ATARI 520STFM Keyboard and Mouse Problem

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seyia
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ATARI 520STFM Keyboard and Mouse Problem

Postby seyia » Tue May 23, 2017 7:22 am

Hi friends.
I am owner of ATARI 520STfm , and It had to switch-ON for 25 years, due a problem on the VGA 13PIN Cable.
I fix that, and the machine is a live again. I spend 3 hours to check my old floppy disk games and suddenly after a reboot, the cursor on desktop not move at all.
My expectation was that is a mouse cable problem, but my digimeter shows that all the mouse pinouts is OK. Even from board circuit to the mouse.
I try to move the cursor by keyboard (alt + arrow) but nothing.
I have the impression that all the keyboard an serials (mouse , joystick) is dead.
I don’t know what can be wrong. How to proceed? Any ideas? is there a useful way to check the pinouts of Keybord board. (7 pins)

Ps. Sorry for my English.

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Re: ATARI 520STFM Keyboard and Mouse Problem

Postby exxos » Tue May 23, 2017 7:40 am

I would start by resoldering the ports and the cable connectors (not shown in images)

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Re: ATARI 520STFM Keyboard and Mouse Problem

Postby seyia » Tue May 23, 2017 7:51 am

Hi exxos , i already done that yesterday. I made resoldering behind the keybord board, the 9 pins of Mouse and Joystick and the i have meter with polymeter from the pins to inside the mouse. The connections is OK but the problem exist.

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Re: ATARI 520STFM Keyboard and Mouse Problem

Postby exxos » Tue May 23, 2017 7:53 am

Did you resolder the cable connections on ST and keyboard side ? re-seated the IC on the keyboard ? Also use a fresh formatted floppy to get to desktop to make sure something is not locking up your keyboard.
4MB STFM 1.44 FD- VELOCE+ 020 STE - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - various clutter

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Re: ATARI 520STFM Keyboard and Mouse Problem

Postby seyia » Tue May 23, 2017 9:00 am

thank you for Reply

I will resolder all the connention Keyboard <> ST . I mean the 7 pin out keyboard slot. I will re-seat the IC.
About the floppy disk , i am able to format a disk right now , but as i boot up without a floppy is this ok? after 1~ min it came the desktop screen but with the cursor unmove.

It is possible to be a Operating system problem?? a virus from a floppy?? is that possible??

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Re: ATARI 520STFM Keyboard and Mouse Problem

Postby exxos » Tue May 23, 2017 10:21 am

You can leave a floppy out to get to desktop (takes about 45 seconds to get to desktop). the OS is on ROM, so can't be infected with a virus.

I don't understand how you can format a floppy if you can't move the mouse ?
4MB STFM 1.44 FD- VELOCE+ 020 STE - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - various clutter

http://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
http://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.
http://ataristeven.exxoshost.co.uk/Steem.htm Latest Steem Emulator

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Re: ATARI 520STFM Keyboard and Mouse Problem

Postby seyia » Tue May 23, 2017 10:30 am

"I don't understand how you can format a floppy if you can't move the mouse ?"

sorry 'i mean unable to format' syntax error :D

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Re: ATARI 520STFM Keyboard and Mouse Problem

Postby seyia » Tue May 23, 2017 6:23 pm

Finally i resolder all the connections of the Keyboard <> mainboard and the 10pin chip.
I counted +5V on 10pin chip and the microcontroller (all on the keyboard unit) with polymeter and the connections seems to be ok.
I clean with contact cleaner the main board of the ATARI. (Wrong move). I waited to dry out, even I dried it with hairdryer and Now the situation is worst.
When boot up without a floppy disk, is loading quickly (dont wait 45'') the desktop has no floppy disk icon , no recycle bin icon , and the cursor not moving with the mouse or with the keyboard (alt+arrows).
I am very disappointing. :(
Anyway thank you for the replays exxos. Maybe i will send you the Unit and pay you for the job. I am no kidding. :shrug:

Regards.

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Re: ATARI 520STFM Keyboard and Mouse Problem

Postby exxos » Tue May 23, 2017 6:34 pm

That sounds like a odd fault. Just to confirm you haven't put the floppy cable in backwards as that causes odd drive related issues relating to desktop icons missing.
4MB STFM 1.44 FD- VELOCE+ 020 STE - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - various clutter

http://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
http://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.
http://ataristeven.exxoshost.co.uk/Steem.htm Latest Steem Emulator

seyia
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Re: ATARI 520STFM Keyboard and Mouse Problem

Postby seyia » Wed May 24, 2017 8:41 am

Hi , Back to work again , the system returned to previews state with the icons & floppy drive to work.(change the cable of floppy drive)
About the keyboard and Mouse , tomorrow i will change the 10pin chip DM74LS244N (Keyboard Unit).
Is there any way to measure, testing the DM74LS244N(10pin) and HD6301V1P (20pin), or the rx, tx of 7 pin out of keyboard?
I want to figure where is the problem. IS the keyboard unit faulty or after the 7pin out. (motherboard)?

Thanks


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