English Amiga Board

Go Back   English Amiga Board > Support > support.Hardware

Thread Tools
Old 15 April 2019, 16:50   #1
Registered User

Join Date: Mar 2019
Location: Hafrsfjord
Posts: 12
Is my Amiga Cursed? ALICE dying? Bad RAM?

so, having had 2 bad amiga boards, and not enough knowledge (yet) to fix them properly, i managed to trade some stuff for a new amiga1200 mainboard.
my first issue was the keyboard not working properly, this turned out to be two lifted chips from the keyboard chip (from a previously removed external kb hack)
i managed to push them back with my soldering iron and got everything working seemingly fine again.

I also have a blizzard 1220 for expanded ram and faster cpu, which i ordered a ADD4 ram expansion for.
expansion arrived, and i plugged onto the 1220, but the system still only reports 4mb expanded memory. the ADD4 board has a jumper, but still only reports 4mb with jumper on or off (i am not using pcmcia slot at all)

I tried starting some WHDload games, but got a memory error, however regular workbench with apps worked fine.
then after a little while of testing, it started restarting and keyboard became unresponsive after a while. (ctrl-A-A still works, as do capslock light)
opening a text editor shows random keystrokes (seems to be from numlock area)
i unplug the keyboard (i have a onboard keyboard app in workbench if i need keypresses) and notice i get the same issue. tapping/pressing on the CIA-A or Keyboard chip showed nothing. though the issue only starts after a while, so i start checking the chips, and find that ALICE is getting very hot just from workbench idle.. i find a fitting heatsink from and old motherboard (northbridge heatsink as perfect size) and put it on with some noctua ceramic thermal paste, and load some system diagnostics to a CF card to diagnose the amiga. (my floppy doesn't work properly, and i don't have any disks available (but winuae and a cardreader works just as good)
this issue occurs with or without 1220 expansion (with or without ADD4 attached)

starting up amiga test kit, i only still get 4 mb expanded ram showing, even when ignoring kickstarts, however ram tests seems to be working without fail, however, the amiga still presses keys after a while (with heatsink, maybe 5-10 minutes just idling in amiga test kit's keyboard tester) this last time showing keystroke "ff" every third second or so.

Alice still gets very hot no matter what i try.

Long story short;
most likely ALICE chip overheats and creates issues/restarts
also ADD4 expansion does not supply 4mb extra ram (not sure if ADDfor or 1220 or ALICE is to blame for this, or something else entirely)

i've tried:
*two different card reader harddrives (SD and CF) - both work, no change
*with 1220 and add4 - no change (only reports 4mb instead of 8)
*with 1220 without add4 - no change
*without 1220 - no change
*without keyboard - no change
*Had priest perform extensive exorcism
*combinations of with/without keyboard/expansion
*with heatsink on Alice: - no change, but takes longer for issues to arise

is my ALICE chip dying? all the caps look fine, and seem to be changed recently, however i do have an extra set of caps from amigakit i could use to replace them, but i don't want to do that before i've exhausted other less "intrusive" solutions (if there are) or am i looking at a possible alice chip replacement?

i swear, i'm starting to believe that i'm somehow cursed to not have an opreational amiga, if i can't get this fixed, i might just sell off all my amiga stuff and use winuae instead

Last edited by Changis; 15 April 2019 at 16:55. Reason: added issues to title for easy identification
Changis is offline  
Old 16 April 2019, 08:56   #2
old bearded fool

modrobert's Avatar
Join Date: Jan 2010
Location: Bangkok
Age: 52
Posts: 525
I'm assuming you have the A1200 schematics.

Did you try to measure voltage pins on Alice using a multimeter?

Might be a good idea to check other voltage points as well, since Alice gets hot, maybe there's a short somewhere. If so you should be able to measure significantly lower voltages on the power rails.
modrobert is offline  
Old 16 April 2019, 10:18   #3
Registered User

Join Date: Mar 2019
Location: Hafrsfjord
Posts: 12
Yes, i have schematics and amigapcb handy, ill go over the chip when i get home and can get out my multimeter.

After a quick glance yesterday, i could not see any obvious cracks or similar on the ALICE chip, but i might go over it with the soldering iron or hot air station if nothing else works (worst case, i have two more a1200 boards i could steal chips from)

I have attached a "screenshot" of what the amiga thinks the keyboard is doing (note, this is as stock as possible, only cf card harddrive and a serial to usb mouse adapter (shouldn't affect anything)
This is from just after about 2-3 minutes of on-time, not being taxed more than loading the diag software / workbench.

Click image for larger version

Name:	20190416_090452.jpg
Views:	37
Size:	748.9 KB
ID:	62807

I also read somewhere that it might be the kickstart? I have several kickstarts available to test with (3.0, 3.1, 3.x) but i doubt this is the issue?
Changis is offline  
Old 16 April 2019, 12:40   #4
Jope's Avatar
Join Date: Jul 2003
Location: Helsinki / Finland
Age: 39
Posts: 7,400
The problem is in the CIA or the keyboard MCU, I'm sure.
Jope is offline  

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
cursed floppy disks Z3k support.Hardware 7 28 April 2013 16:18
What do you do when your Amiga hardware is cursed? alkis21 Nostalgia & memories 24 15 December 2010 20:30

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT +2. The time now is 23:27.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Page generated in 0.06611 seconds with 16 queries