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41CL MMU Backup
06-02-2020, 01:42 AM
Post: #29
RE: 41CL MMU Backup
(06-01-2020 11:48 PM)twoweims Wrote:  
(06-01-2020 10:48 PM)Monte Dalrymple Wrote:  As in the original HP41, these locations are not readable. The bus stays 3-state for these addresses.

The RAM corresponding to those register addresses is accessible using the NEWT WCMD however (I think, not sure I ever tried it.)

I was able to YPOKE a value into 800800 then YMCPY 800>801 then YPOKE a new value into 801800 then YMCPY 801>800 then YPEEK the changed value from 800800.
So it looks like YPEEK/YPOKE and YMCPY can read and write from this location! Smile

That confirms what I expected. All of these functions use the WCMD instruction.
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Messages In This Thread
41CL MMU Backup - twoweims - 05-28-2020, 10:15 PM
RE: 41CL MMU Backup - Monte Dalrymple - 05-29-2020, 04:07 PM
RE: 41CL MMU Backup - twoweims - 05-29-2020, 04:44 PM
RE: 41CL MMU Backup - Monte Dalrymple - 05-29-2020, 05:49 PM
RE: 41CL MMU Backup - twoweims - 05-29-2020, 08:50 PM
RE: 41CL MMU Backup - Monte Dalrymple - 05-29-2020, 10:09 PM
RE: 41CL MMU Backup - twoweims - 05-30-2020, 01:05 AM
RE: 41CL MMU Backup - Ángel Martin - 05-30-2020, 05:22 AM
RE: 41CL MMU Backup - twoweims - 05-30-2020, 02:32 PM
RE: 41CL MMU Backup - Ángel Martin - 05-30-2020, 03:45 PM
RE: 41CL MMU Backup - Ángel Martin - 05-31-2020, 06:09 AM
RE: 41CL MMU Backup - grsbanks - 05-30-2020, 08:27 AM
RE: 41CL MMU Backup - Ángel Martin - 05-30-2020, 03:52 PM
RE: 41CL MMU Backup - Monte Dalrymple - 05-30-2020, 06:47 PM
RE: 41CL MMU Backup - rprosperi - 05-30-2020, 10:36 PM
RE: 41CL MMU Backup - Monte Dalrymple - 05-30-2020, 11:58 PM
RE: 41CL MMU Backup - rprosperi - 05-31-2020, 03:00 AM
RE: 41CL MMU Backup - Monte Dalrymple - 08-07-2021, 02:07 AM
RE: 41CL MMU Backup - Ángel Martin - 05-31-2020, 06:55 AM
RE: 41CL MMU Backup - Monte Dalrymple - 05-31-2020, 06:22 PM
RE: 41CL MMU Backup - twoweims - 05-30-2020, 08:26 PM
RE: 41CL MMU Backup - Monte Dalrymple - 05-30-2020, 10:07 PM
RE: 41CL MMU Backup - twoweims - 05-31-2020, 06:30 PM
RE: 41CL MMU Backup - rprosperi - 05-31-2020, 06:51 PM
RE: 41CL MMU Backup - twoweims - 05-31-2020, 07:44 PM
RE: 41CL MMU Backup - rprosperi - 05-31-2020, 08:09 PM
RE: 41CL MMU Backup - twoweims - 06-01-2020, 09:24 PM
RE: 41CL MMU Backup - Monte Dalrymple - 06-01-2020, 10:48 PM
RE: 41CL MMU Backup - twoweims - 06-01-2020, 11:48 PM
RE: 41CL MMU Backup - Monte Dalrymple - 06-02-2020 01:42 AM
RE: 41CL MMU Backup - grsbanks - 06-04-2020, 07:14 PM
RE: 41CL MMU Backup - Monte Dalrymple - 06-04-2020, 08:50 PM



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