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Another Prototype Lisa Card

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AlexTheCat123:

--- Quote from: ried on August 06, 2025, 09:58:19 pm ---Should I burn a 2716 and add both chips back to the board? Or does this look like it'd do ghastly things to an otherwise working Lisa?

--- End quote ---

I think I'd replace the chips and plug it in! It looks like the resistors are probably just loading the power rails, so it's understandable for them to get hot and burn the board if the card has been plugged in for a long time. Assuming you check for shorts on the power rails before sticking it in a slot, I don't think you've got much to worry about.

stepleton:
That was my conclusion about the resistors too: they are just there to put a load on the power rails, giving this card an additional testing function besides DMA testing.

As mentioned elsewhere in the thread, there is not a whole lot that's interesting inside the ROM. But it seems better to have it than not!

ried:
It works! Well, it does whatever a DMA Test Card does... Behavior is consistent with other cards in this thread:

https://youtu.be/qFD37dJXe0E

Special thanks to stepleton for making his card's ROM available, and to Lisa2 for burning me a copy. You guys rock.  8)

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