HP Forum Archive 13

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41CY Message #1 Posted by Holger on 21 June 2003, 5:04 a.m. A 41CY without handbooks but with printer just went over the counter for 969 Euro http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&category=9972&item=2539285844 I guess before long we have to put our hp's into a bank deposit..

Re: 41CY Message #2 Posted by Matthias on 21 June 2003, 7:05 a.m., in response to message #1 by Holger I saw and bidded on this auction too.. a very high price for a "not mint" CY.. I told to the seller before and got a very gentle impression of him.. He will be happy for that much money, cause I told him to sell it on ebay.. he wanted to sell it private and his highest bid from me was $500.... My last bought CY is mint and full working for much less money... Matthias

Re: 41CY Message #3 Posted by John Smith on 21 June 2003, 11:57 a.m., in response to message #2 by Matthias What is 41CY? I'm dying to know. How is it different than 41CV or CX?

Re: 41CY Message #4 Posted by Holger on 21 June 2003, 1:26 p.m., in response to message #3 by John Smith The CY is not from HP, it's a 'CX on steroids'. Some firm whose name I forgot made them. They were supposed to be twice as fast as a genuine CX and had a 'rambox' which's purpose I don't know. There are some rumours that the configuration was not very stable. They are very rare. Matthias has some info on his website. http://www.hp-collection.org/Rechner/hp-41cy.htm

Re: 41CY Message #5 Posted by Raymond Del Tondo on 21 June 2003, 5:02 p.m., in response to message #4 by Holger Forget the rumours about stability, since we're not talking about the 49G;-) Seriously, the CY worked very well. At least the units I worked with. The RAMBox can be seen as module simulator, or simply as additional RAM. 64K is much space for HP-41 programs... Raymond

Re: 41CY Message #6 Posted by Johnny Billquist on 23 June 2003, 7:38 a.m., in response to message #5 by Raymond Del Tondo I'd like to know how this 64K memory worked. The CPU cannot use it in a "normal" manner. Normally addressed memory is read-only in the 41 architecture. The full address range is 64K, but the "OS" itself take a big part of that range, and modules just about can fill up the rest. I don't see how you could have an additional 64K in there. RAM is addressed as a device. But the full address range is only 1024 registers unless my memory fails me. That's 7K. And almost all of it is used if you have a CX and two X-MEM modules. What's left (that I can see) is that you have a module that have 64K as offline storage. Usable in a similar way as X-MEM or as HP-IL mass storage. Perhaps someone else can fill me in here?

Re: 41CY Message #7 Posted by Raymond Del Tondo on 23 June 2003, 8:05 p.m., in response to message #6 by Johnny Billquist Hello, the RAMBox of a CY is divided into 2 32K banks. You can programmatically switch them by the W&W RAMBox OS's commands PG<>, PG01, PG10 . As said in earlier posts, the RAMBox part simulates ROM pages in the HP-41. For the CPU it looks like ROM, but with suitable software, like David assembler, or RAMBox OS's data functions, you can simply modify it, and use it like a RAM disk. Regards, Raymond

Re: 41CY Message #8 Posted by james (UK) on 21 June 2003, 3:27 p.m., in response to message #3 by John Smith See the following re 41CY http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv013.cgi?read=35317 re rambox http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv006.cgi?read=9731 41s rock!

Re: 41CY Message #9 Posted by Holger on 21 June 2003, 1:13 p.m., in response to message #2 by Matthias I lost interest when the bid went above 400 EUR. Probably the last chance to snatch one, however..

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