HP-41 - Memory modules

[grsbanks]

(04-08-2019 06:42 PM)Jurgen Keller Wrote:  I once wrote a small test program. Unfortunately, the article is in German but maybe Google translate helps ...

Here's a translation of that article that got nowhere near Google

In the HP-41 Memory Test article I promised an Extended Memory test program. It's high time to keep that promise!

It works in a similar way to earlier programs, i.e. a value is written to every X-Mem register and then read back. If the same value is read back then the register under test is deemed to be OK.

An HP-41CX - or an HP41C/CV with X-Func module - has 124 X-Mem registers. An HP 82181A X-Mem module adds a further 238 X-Mem registers. Up to two such modules can be plugged in, bringing the maximum memory configuration up to 124 + 2 * 238 = 600 X-Mem registers.

The "XMEMT" program starts by using EMDIR to find out how many X-Mem registers are usable. If they're all in use, the program bails out with a "DATA ERROR." If you want to make sure that all registers are tested then you must delete any pre-existing files.

Here's the program.

It may take some time...