Near death experience

Yesterday I was busy building a bootselector with a 74ls241, when ready I checked for short circuits, everything looks good.
But when powering the Amiga some smoke appeared from her…
I double checked the circuit, but couldn’t find any error..
I removed the 74ls241 from the schematics and used a 4 wire cable to connect the switch.
I wanted to use the 74ls241 to avoid having big cables running through her.
I tested the bootselector and it worked.

 

Searching for memory

To upgrade my Amiga 500 (rev 5.) to 1 Mb chip ram I need an A501 extension board or 16 ram chips.
As I can’t find an extension board, I started to look for 16 4256 or 41256 fast mode dram chips.
on Ebay I can find them for $2.50 per piece (so totaling $40.00 without shipping), this is to expensive for me, so I continued my search.
I found some shops that still sell them, but most are in the same price range (or charge high shipping costs for shipping to Europe).

But I seems to find one place now, but I’m not sure if this are the correct ones.
I send them a mail, asking for the brand, so I can check the datasheets
Check the Futurlec website, the part number seems correct, and for $0.95 per piece.