Search found 3 matches

by spett
Fri Jan 13, 2017 9:23 pm
Forum: Hardware
Topic: 520STfm with 20 bombs
Replies: 7
Views: 1678

Re: 520STfm with 20 bombs

IT's ALIVE! :lol: :lol: While probing /DTACK /CS lines etc I discovered that one address line was not acting correctly @ GLUE. A corroded via was the cause resulting in a ~100k resistance between GLUE and the rest of the address bus. A little rubbing, cleaning and some solder and it is booting :D Th...
by spett
Tue Jan 10, 2017 8:44 pm
Forum: Hardware
Topic: 520STfm with 20 bombs
Replies: 7
Views: 1678

Re: 520STfm with 20 bombs

Or is there more change needed to swap HI/LOW RAM banks? So you do have 2 banks with 512KByte each? ⋅ Get schematics (1040STFM) and Service manual (e.g. Download section of my homepage). ⋅ Read the section "Troubleshooting a dead unit" in the service manual. ⋅&nbs...
by spett
Mon Jan 09, 2017 9:32 pm
Forum: Hardware
Topic: 520STfm with 20 bombs
Replies: 7
Views: 1678

520STfm with 20 bombs

Hi all! After reading alot of great information on this site I finaly decided to create a user account, well, because I need your help! :angel: I got a 520STfm here which don't boot. 20 bomb instant after reset/power. Bougth this broken and it came with a 1 meg Xtra-RAM upgrade installed, this is no...

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