41CY

[Holger]

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..

[Matthias]

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

[john smith]

What is 41CY? I'm dying to know. How is it different than 41CV or CX?

[Holger]

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

[Raymond Del Tondo]

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

[Johnny Billquist]

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?

[Raymond Del Tondo]

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

[james (UK)]

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!

[Holger]

I lost interest when the bid went above 400 EUR. Probably the last chance to snatch one, however..