HP48GX RAM card design
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01-20-2021, 03:48 AM
(This post was last modified: 01-20-2021 12:07 PM by wan.)
Post: #16
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RE: HP48GX RAM card design
According to the 48gx inside board photo and circuit schematic, the built-in sram chip is connected directly to Saturn chip. That's why I think the series resistors can be cancelled.
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? |
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