Mike Brixius
Experienced Member
While I'm waiting for the parts to come in for the pet i decided to get a ZIF-64 put together out of some old parts for my plan to fix 64 64s in 23 -- which, if you reverse the digits then double it is 64 --
Anyways i took a 250407 rev c that the original owner was using for parts. A lot of ics had already been desoldered very neatly so it seemed like a good candidate. After installing ZIF sockets and populating the board with everything but a SID i was pleased to find only 1 74ls257 needed replacing.
Then i installed the sid and on power up i get a crackle in the speaker and a black screen. Now i know that a bad sid can cause this so i installed a swin-sid i keep for testing and got the same result.
Interesting. I'll put the scope to work on the morning but i thought it was unusual.
Anyways i took a 250407 rev c that the original owner was using for parts. A lot of ics had already been desoldered very neatly so it seemed like a good candidate. After installing ZIF sockets and populating the board with everything but a SID i was pleased to find only 1 74ls257 needed replacing.
Then i installed the sid and on power up i get a crackle in the speaker and a black screen. Now i know that a bad sid can cause this so i installed a swin-sid i keep for testing and got the same result.
Interesting. I'll put the scope to work on the morning but i thought it was unusual.