allisonlastname wrote:
the 62256s I have don't play nicely with the 6502 for whatever reason
Was there any followup on this matter? In
this post you mentioned fixing an error in a RAM test jig you created. And the 62256s then tested successfully in the jig, but still failed when installed in your project. One possible explanation is, the inputs on the test jig recognize TTL voltage levels, whereas the inputs on a modern WDC CPU do
not. It's plausible that the 43256 you got from your dad significantly *exceeds* the spec (as many TTL-rated chips do), but the 62256s... not so much.
allisonlastname wrote:
exploded
I assume you're just being colorful with your speech... although chips truly can and do sometimes explode! Check out the DC-to-DC buck controller IC in the Keyence industrial vision controller I repaired earlier this year! A surge on the incoming 24VDC left a crater in the IC and also vaporized one of the tiny PCB traces underneath.
-- Jeff
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