68kMLA Classic Interface
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| Click here to select a new forum. | | Interest in adapting 744x to 7400? | Posted by: herd on 2025-04-22 15:22:07
There are a number of differences between the "7400" G4 and the "7450" G4. You have the schematics for the iMac you were working on, right? | Posted by: indibil on 2025-04-22 21:50:12
Well, I haven't looked at that schematic, but I've been comparing the datasheets and looking at the notes over the last few weeks, and from what it says there, the connection should be like this on the 744x:
A[0:3] pulldown to GND
A[4:35] -> A[0:31] 7410
AP[0] pullup OVdd
AP[1:4] -> AP[0:3] 7410
BMODE0 -> EMODE 7410
BMODE1 pullup OVdd
Only one PLL would be missing between the 744x and the 7410. It could be added to the interposer, but I don't see that you've added it to yours. Do you have two versions, one to OVdd and the other to GND?
And I think the rest of the pads have their corresponding 7410. | | < 4 |
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