A Lisa Inside An FPGA

[stepleton]

Great to see this, but 37 watts is quite a draw! I'm glad to know that this is what's needed.

[slewis1962]

Great to see this, but 37 watts is quite a draw! I'm glad to know that this is what's needed.

I'm not sure what exact conditions caused the 7.5 amps the other day. I had two disks in just like in this video but it didn't get that high. Unless I just happened to catch the peak that day. I imagine a data logger of some kind could give a more accurate representation of what's normal.

[AlexTheCat123]

It's great to see both drives working! That's some pretty crazy power consumption though. When I designed the board, I was guessing about 2A max when the drives were active (spindle on and seeking), so 7.5A is absolutely crazy. To be fair though, I had no way of knowing given that I don't have any Twiggies myself!

[ried]

That's great!!! One drive confirmed to be fully-working. I wonder what's going wrong with the lower drive though? You are running the latest firmware that's supposed to fix the bug, right?

I jumped back into this today, suspecting that the four-pin TWIG port on the board and the AUX IN on the breakout board might not be making good connections via that 6-pin cable. I bent the prongs further up on each and, sure enough, now the lower drive's spindle motor spins just fine.