HP48GX RAM card design

[pdo]

(01-20-2021 03:48 AM)wan Wrote:  About the bank switching card, I have some questions.
1 Can the high-level signal of the switches be connected to vccon instead of vcc, for power saving?
2 Can write protect switch be connected to the we line instead of the cdet line, for hardware level protection?

Hmm, interesting questions, but I can't answer them with any certainty because I don't know in detail how the processor chip works.

Perhaps there is some design documentation from HP somewhere that would enlighten us in this area, but unfortunately I'm not aware of any.

Paul