ARRGGG HP 41 double x memory experts, help



#4

After following Christoph Klugs adobe file to the letter (IMHO) I doubled up my x-memory module with two x-memory chips.

I installed it in the Full nut HP 41 cx and did a cat 4 and got 600. Yahoo! so I then filled it with programs to the 589 point, i.e. 21 registers left and catalog 4 gave back all the correct program headers and byte counts. I then downloaded back to main memory a bunch of programs which loaded correctly.

I then tried to execute a program and the screen froze. Removing the module allowed the program to run. Single stepping the program with the module in and out also correctly ran. The calc freezes up with the module in and using the R/S function only.

I then tried my half nut 41cx and got the same response.

I then tried my 41c with Quad memory, extended functions module and the new 2-X memory module and it WORKS PERFECTLY with the new module, loading, downloading and executing.

To summarize:

HP 41 CX halfnut with new 2-x Module installed uploads and downloads to the module correctly. Programs operate correctly in main memory using SST command but not R/S. Cat 4 = 600.

HP 41 CX fullnut displays the same symptoms. Cat 4 = 600

HP 41 C fullnut with new 2-x Module installed uploads and downloads to the module correctly. HP 41 C also has Quad memory module and extended functions module installed. Programs operate correctly in main memory using SST command and R/S. EMDIR = 600.

Does it look like I just created a 2-x Module for the HP C only?

Help,

Geoff


#5

Did you follow Winfried Maschke's hints when wiring the chips?

Pointer: His comment in the 'Triple module thread'

HTH

Raymond


#6

Unfortunately no,

I used the articles published in the PPC and the article at the museum by Christoph Klug.

After about 90 minutes of finicky soldering I managed to get the module assembled.

It works in the HP 41C with an x-functions module and quad memory chip perfectly allowing all programs to execute.

It works in the HP 41CX for uploading and downloading but will not allow any file to execute as long as it is installed. The programs do execute with SST with the module in place.

WEIRD

Edited: 5 Apr 2008, 2:50 p.m.


Possibly Related Threads...
Thread Author Replies Views Last Post
  ALL The Experts ARE HERE! Ron Ross 1 186 12-06-2013, 01:50 PM
Last Post: Kévin Ouellet (Canada)
  HP-41(CL): The easiest way to transfer FOCAL programs from a Linux PC to the HP-41 Geir Isene 13 707 12-05-2013, 02:40 AM
Last Post: Hans Brueggemann
  [wp34s] Converting to/from IEEE 754 Binary64 (Double Precision) David Maier 1 137 06-15-2013, 09:21 PM
Last Post: Paul Dale
  41 User Memory vs System Memory Gerry Schultz 6 339 07-01-2012, 12:02 AM
Last Post: Monte Dalrymple
  Double-shot Molded Keys Jeff Dinkins 4 189 04-23-2012, 07:19 PM
Last Post: Eric Rechlin
  Need an experts advice: which is currently best CAS? Mike (Stgt) 18 624 04-16-2012, 07:48 AM
Last Post: Mike (Stgt)
  HP-41 Memory chips info (for those HW guys out there :-) Diego Diaz 3 197 03-24-2012, 08:06 PM
Last Post: Diego Diaz
  WP 34S: Double precision registers - What are your feelings? Marcus von Cube, Germany 16 554 12-26-2011, 10:49 AM
Last Post: Dieter
  HP-15LE: Anybody else see double key registrations? BobVA 5 245 11-13-2011, 06:48 AM
Last Post: Jan
  [WP 34S] A-D double duty suggestion Dominic Richens 19 636 10-17-2011, 02:20 AM
Last Post: Marcus von Cube, Germany

Forum Jump: