HP Forum Archive 13

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RamBOX Message #1 Posted by Matthias on 20 July 2003, 4:38 p.m. Is it possible for anybody to rebuilt a RamBOX, so that this powerfull instrument would become a Xmas present for some of us? What would be the problem for this? I know that there are some hardware designers like Christoph Klug that could perhaps built this... I would buy it...

Re: RamBOX Message #2 Posted by Emmanuel, France on 20 July 2003, 5:52 p.m., in response to message #1 by Matthias dear matthias, First you have to find plans. They are certainly not available as public domain. May someone be able to understand a 4K RAM MLDL plans?! Yours.

Re: RamBOX Message #3 Posted by Raymond Del Tondo on 20 July 2003, 6:12 p.m., in response to message #2 by Emmanuel, France Hi, maybe in some PPC Technical notes are some hints. AFAIR the ERAMCO compatible design is or was available somewhere. PPC Journal CD's ? Or perhaps Meindert has an idea ? ;-) Raymond

Re: RamBOX Message #4 Posted by Matthias on 20 July 2003, 6:16 p.m., in response to message #2 by Emmanuel, France Is a opened RamBox not enough? You only need the plan of the print, do you? Second you need a system software... W&W is ok...

Re: RamBOX Message #5 Posted by Emmanuel, France on 20 July 2003, 6:45 p.m., in response to message #4 by Matthias I have a W&W 32K RSU too. But only 28K are available (4K RAM out of order). I opened it, there's a lot of CMS and connexion are really thin between components and some hidden behind them. May be Jean-François would be better than me. Please contact him: jfgarnier@wanadoo.fr

Re: RamBOX Message #6 Posted by Meindert Kuipers on 21 July 2003, 2:38 a.m., in response to message #1 by Matthias Do you mean to rebuilt an original old design? I am working on a completely new design that is a RAMBox! See the specifications at www.kuipers.to/hp41. Meindert

Re: RamBOX Message #7 Posted by Christoph Klug on 21 July 2003, 7:32 a.m., in response to message #6 by Meindert Kuipers Dear Meindert, It makes much sense, that you complete your actual design (working with modern technologie and parts). Rebuilding existing Eramco or W&W Ram-Box solutions is too much work and some storage IC parts not available today or exotic and hard to find. The "traditional" Eramco and W&W Ram-Box solutions are absolutely nice parts for active HP41 user and for any collector. Unfortunately Ram-Box systems hard to find. Up to now (and for future times) Zeproms are the leading solution for concentrating maximally power in only one HP41 plug in port... Best wishes from Germany -Christoph

Re: RamBOX Message #8 Posted by Meindert Kuipers on 21 July 2003, 9:19 a.m., in response to message #7 by Christoph Klug Christoph, Can you actually make the ZEPROMS or just program them? Meindert

Re: RamBOX Message #9 Posted by Grant Goodes on 21 July 2003, 10:30 a.m., in response to message #8 by Meindert Kuipers Yeah, my question exactly. I have a dual-Zeprom programmer, but no Zeproms, and haven't been able to find any. The guy I bought the programmer from had a stock of unmounted Zeprom EPROMs, but threw them out! If anyone (Christoph?) has Zeprom that they'd be willing to sell me (don't need the voltage convertor, and can be totally blank, which would normally make it pretty useless to people), I'd be willing to pay well for it. grant..

Re: RamBOX Message #10 Posted by Matthias on 21 July 2003, 11:03 a.m., in response to message #9 by Grant Goodes Cool, and I'm looking for a ZEPROM burner and do not get on.. ZEPROMs I have some....

Re: RamBOX Message #11 Posted by Raymond Del Tondo on 21 July 2003, 2:19 p.m., in response to message #10 by Matthias Hi Matthias, too late. I used to have a very huge Zengrange ZEPROM programmer with 8 (EIGHT) ZEPROM module slots. I traded it away a while ago ... Raymond

Re: RamBOX Message #12 Posted by Matthias on 21 July 2003, 4:11 p.m., in response to message #11 by Raymond Del Tondo Grrrrrrrrrrrrrrr........

Re: RamBOX Message #13 Posted by Peter on 22 July 2003, 10:45 a.m., in response to message #12 by Matthias Don't say so, Matthias, it's a nice piece... -peter

Re: RamBOX Message #14 Posted by Jeff on 21 July 2003, 8:02 p.m., in response to message #7 by Christoph Klug I am currently building the old version of the MLDL posted in the PPC Journal some years ago. The only IC's that I cannot find are the 4k x 1 Static Ram, TC5504AP-2. Does anyone know where these can be found?

Re: RamBOX Message #15 Posted by James on 22 July 2003, 4:44 a.m., in response to message #14 by Jeff Quote: I am currently building the old version of the MLDL posted in the PPC Journal some years ago. The only IC's that I cannot find are the 4k x 1 Static Ram, TC5504AP-2. Does anyone know where these can be found? I suggest you use an 8 bit SRAM chip in place of two 1 bit chips, and waste 6 bits (tie them to ground, perhaps through a resistor). HTH, James

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