shuyge
Member
I've been working on fixing my first CPU board and I've determined that chip 3D is bad. The local DRAM address line A2 is stuck low. I've got signal coming in, but nothing coming out.
The BOM indicates that the part is a 74153 which is a dual 4 to 1 multiplexer.
The question is which variant of 74153 do I buy and is brand important for the Williams CPU boards? Williams in their infinite wisdom decided to put stickers on all of the chips and I am unable to read the original markings on the existing chip.
Do I get a straight up 74153, a 74LS153?
Any advice from people who have repaired these boards already?
TIA,
Stan
The BOM indicates that the part is a 74153 which is a dual 4 to 1 multiplexer.
The question is which variant of 74153 do I buy and is brand important for the Williams CPU boards? Williams in their infinite wisdom decided to put stickers on all of the chips and I am unable to read the original markings on the existing chip.
Do I get a straight up 74153, a 74LS153?
Any advice from people who have repaired these boards already?
TIA,
Stan
