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(41CL) backup RAM to computer over serial port
03-10-2019, 01:57 AM
Post: #1
(41CL) backup RAM to computer over serial port
Having recently done my first flash update over the serial port, using Sylvain & Monte's excellent tools, and discussing Ángel's possible updates to YWALL to allow backup of RAM to flash on the V5 board, I wondered…

Is it feasible to backup RAM pages 0x800 & 0x804 over the serial port to a PC, using YEXP, and subsequently use YIMP to successfully restore the state?

Flash backup is convenient, and covers most cases, but doesn't cover loss or damage of the 41CL itself. e.g. I drop it, or lose it, in the pub.

I have just ordered a PIL-Box from Jean-Francois, and am now looking for an HP-IL module & cable, which will give me another way to back things up, but is the above feasible?

Cambridge, UK
41CL, 12C/15C, DM15/16, 71B, 17B, 28S, DM42, 48GX, 17bII+, 50g (& newRPL), 35s, 30b (WP 34S), Prime G2
& Casios, Rockwell 18R :)
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03-10-2019, 07:43 PM
Post: #2
RE: (41CL) backup RAM to computer over serial port
(03-10-2019 01:57 AM)cdmackay Wrote:  Is it feasible to backup RAM pages 0x800 & 0x804 over the serial port to a PC, using YEXP, and subsequently use YIMP to successfully restore the state?

I have never done this but it should work fine.
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03-10-2019, 09:54 PM
Post: #3
RE: (41CL) backup RAM to computer over serial port
(03-10-2019 07:43 PM)Monte Dalrymple Wrote:  I have never done this but it should work fine.

Thanks Monte, I'll have a play.

Might also be fun to write a few PC programs to extract/decode the contents of those backups, e.g. RPN registers, key assignments, files in extended memory, MMU registers etc. I'll have a go at that, too.

Cambridge, UK
41CL, 12C/15C, DM15/16, 71B, 17B, 28S, DM42, 48GX, 17bII+, 50g (& newRPL), 35s, 30b (WP 34S), Prime G2
& Casios, Rockwell 18R :)
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