(Ultimem) expansion RAM cleared on hard reset?

[pixel]

My stuff's in storage, so I cannot check myself.

[Mike]

Not on its own. I'd guess at least.

What happens in VICE is probably another matter. Ctrl-R performs a reset but keeps RAM contents - internal, normal RAM expansion, and presumably of banked RAM expansions as well -, Shift-Ctrl-R clears the RAM, better said, applies the RAM init pattern to BLK0..BLK3 but fills BLK5 with all zeroes.

On real hardware, you'd need a routine in firmware to clear the banked RAM, as the KERNAL of course knows nothing about Ultimem. Also, the KERNAL only initialises pages 0, 2 and 3 upon power on/reset and doesn't touch other RAM, i.e. the RAM test performed is non-destructive.

...

You're concerned the contents of a RAM disk on Ultimem (hopefully) survive a reset?

[pixel]

You're concerned the contents of a RAM disk on Ultimem (hopefully) survive a reset?

That would be lovely. And it's key to the fast restore on reset. Want "Ingle" to jump right back to where it was.

Cannot work on that game at the moment but wanna nail something down anyway. Am starting a new job next week, so even I should get an own place to live here in Berlin again.

[pixel]

Oh, well, and multi-processing. Not multi-tasking.

And thanks for your help, btw.

[brain]

Sorry for the delay. RAM is not reset on reset.

Jim

[eslapion]

The RAM in 32k/35k Ultimate Expanders I have sold in the past is also not cleared on reset.

Some of them used Cypress SRAM ICs which had trickle power mode. If you had a 1541 disk drive attached to the IEC port, the trickle amount of power flowing back in the VIC-20 through the reset line would be enough to keep the content of the SRAM intact even when turning the VIC-20 off.

[pixel]

Hey, that's great! Thanks! Works out pretty well. Returns to the GUI within a blink of an eye. Will show off later.