HP48GX RAM card design

[pdo]

(06-12-2017 01:08 AM)EugeneNine Wrote:  I was going to ask about SX but see you mentioned it. I was thinking the SX can't address that much so I'd need to use a smaller ram chip.

Yes, I hoped that the addition of the A17 and A18 switches would allow operation in an SX as well as operation in either slot of a GX but, as I described in the README, something I don't understand is going on there, so now I can't be confident of it working in an SX.

When I have some more time I'll write a bit of software and look at the signals on a scope to try to figure it out (unless someone out there knows what is happening and can educate us first!).

Paul