Is there a self test for HP41CV?
Thanks
Pio
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Self Test for HP41CV
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12-25-2001, 06:17 PM
Is there a self test for HP41CV? Thanks Pio ▼
12-25-2001, 08:30 PM
Yes there is, but unfortunately not built-in.
Raymond
12-26-2001, 03:04 AM
I have seen a display test on the PPC ROM if you have one. However, as the name says, it is only a display test. It is named "DT" on the ROM. It should work for any 41C series. Randy ▼
12-26-2001, 09:14 AM
Ok. So, the 41 doesn't came with a self test in rom.I think here in Brazil will be almost impossible to get on of these testing roms. Thanks. Peace, prosperity and happy new year for all Marx Pio
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12-27-2001, 02:31 AM
to find a test ROM anyway! I have never seen one offered for sale. They certainly would be expensive too since they were never meant to be released outside HP repair centers. ▼
12-27-2001, 06:20 AM
Hi, Randy (and falks) I've seen some posts mentioning the test ROM and recently this one from Pavel called my attention. I was not known that a separate RAM was needed to perform the test. After reading the post I realized that that would depend on what sort of tests were performed so an additional RAM would be needed to store intermidiate results, maybe, to be compared (does the FLAG name come from this?) to references already built inside the test ROM itself. Just wondering. I have never seen the test ROM itself, and I would like to know how deep the tests go into calc's both O.S. and H.W., say, would the results give significant information for us who will try to repair the calculator? Or it would be valuable just to confirm the calculator's O.K. status? As Randy mentions, the test ROM is somewhat hard to find. Is it important having it? I believe e-bay dealers should have one, so the 41's walking around there would be tested before going to final buyer... Just wondering. Cheers. ▼
12-27-2001, 06:38 AM
Hi,
I don't know if any of these Test ROM's are available as modules, Many years ago I had these, and they worked.
Raymond ▼
12-27-2001, 07:31 AM
Hi, Raymond; thanks answering the post. Now I'm somewhat curious: as the ROM is not a module, what is it? One single IC that is placed/soldered inside the calculator? I cannot visualize it. What is it physicaly? Thanks. ▼
12-27-2001, 10:01 AM
Hi Luiz,
I don't know they have ever been produced as modules,
I used the images many years ago in my MBK ProfiSet,
I loaded them into the first RAM bank, then switched the base address to 4xxxh. There were some tests, of which I only recall the keyboard test.
It was somewhat difficult to get rid of it again, Regards, Raymond
BTW: Obviously there existed another maybe interesting module for the HP-41: the remaining key labels are just the numbers and the R/S label. I got this kbd overlay from an HP dealer in the early eighties, but unfortunately not the ROM;-)
12-28-2001, 02:55 AM
raymond, cheers, hans
12-27-2001, 04:31 PM
The HP41C servive manual (on the HPMUSEUM disks) mentions the "FLAG" module as being a modified RAM module used to test the flag inputs in the calculator I/O ports. I don't think it actually uses the RAM chip, but has a manual switch input that connects to the bus FLAG line. |
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