|Re: HP-41CX Speedup|
Message #7 Posted by Diego Diaz on 29 Sept 2008, 5:10 a.m.,
in response to message #5 by Garth Wilson
Though it is physically possible to combine Adv + Zeprom, this will turn up into a very restrictive module.
The reason behind this is that Advantage already uses both pages of the port it is plugged in, thus Zenrom (or whatever othe module you may want to combine with it for that matter) must be hardwired mapped to a different physical port. Therefore, you must keep the port, "occupied" by Zenrom, free or use it with a System addressed module (the double X-MEM for example).
According to the list of modules you've supplied, and assuming you need all of them plugged into your calc saving as much ports as possible; the best module combination to my mind should be:
Zenrom (usses upper page) + Ext I/O into one module. -> Port 1
Advantage + HP-IL into HP-IL housing. -> Port 3
Double X-MEM is ok as it is. -> Port 2
This will leave port 4 free, both phisical and address, to use any other module or peripheral you may need.
However, I'd rather prefer to get the original modules as they are and even remove Ext I/O from the HP-IL housing and place it back into its housing; and use a Clonix instead... and no, I'm not saying this because I build Clonix, just because, these original modules like Ext -I/O or Zenrom are rare and valuable, and I wouldn't put'em into risk by sending them to someone to open and re-solder. While you can have Adv + Zenrom + Ext-I/O into a single Clonix and still have one extra page to load any other 4k .ROM module image. Further more, you'll still have port 4 empty (only lower page) to plug yet another 4k ROM pack, or the Card Reader, or Wand...
Hope this helps.
Cheers from The Canary Islands.
Edit: Meindert, You've said it faster, clearer, and into fewer words... kudos!! ;-))
Edited: 29 Sept 2008, 5:15 a.m.