NoV-64D and HEPAX Questions

[BitWiz]

Sylvain,

I'm sorry for not making what I'm trying to accomplish very clear.

First let me give you a little background on me. I've been an embedded systems engineer for more than 40 years. I started synthetic programming not long after Bill Wickes book came out. Once I got my ERAMCO 16K RAM box I started M-Coding. So I am familiar with both the FOCAL and M-CODE architecture of the 41.

My goal with the NoV-64D is to maximize the number of ROMs I can have in the M-CODE Address space. If the capabilities are there I would like to be able to switch some of ROMs enabled on and off without removing the module from the 41.

The only use for all of the memory on the Nov-64D will be either to hold ROM images or for M-Code development. I will not be using the HEPAX 64K RAM for anything other that. I don't need to have FOCAL programs in the M-CODE address space.

I totally understand what QROM (ROM Emulation) is.

Here's what I understand the NoV-64D can do:

1. NoV-64D 48K flash ROM - Map any 4K block of flash ROM to any HP-41 Page and Bank.
2. Nov-64D 64K FRAM - Map "RAM Chip" 1, 2 or 3 (16K) to HP-41 Pages 0x8 to 0xB.
3. Nod-64D 64K FRAM - Disable flash ROM and MAP, "RAM Chip" 1, 2 or 3 (16K) to HP-41 Pages 0xC to 0xF.

What I don't understand is what the HEPAX capabilities are for using it's RAM only as QROM. That includes the following questions:

1. Can the HEPAX RAM (regardless of what RAM chip it is) be assigned in 4K blocks to any HP-41 Page and Bank like the NOV-64D flash ROM?

2. Clonixconfig puts the HEPAX ROM at HP-41 Page 8. However, the NoV-64D configuration, in both 16K and 32K mode puts RAM there. If all HP-41 Pages below 8 are in use (library 4 in HP-41 Page 4, HP-IL module installed). Will the HEPAX module see that HP-41 Pages 0x8 - 0xB are RAM and then move itself to HP-41 Page 0xC?

3. The NoV-64D can assign HEPAX 16K RAM chips 1, 2 & 3 but there are 4 16K RAM chips in the NoV-64d. How does that last 16K get used.

4. In conjunction with the answer to #1, how do I assign HEPAX RAM as QROM 4K blocks to HP-41 Page and Bank?

5. Are there HEPAX ROM commands that will allow me to reconfigure the HEPAX RAM (as QROM) mapping in the HP-41 M-Code address space so that I can enable and disable QROMs (with a power cycle) under software or manual control without having to download new ROM images into the HEPAX RAM? This would allow me, for example, to turn on the PPC ROM when I want to use it but map that out and map the HP-IL DEV ROM into the same 2 HP-41 Pages?

6. Will #5 work with bank selected ROM in QROM.

If this still doesn't make clear what I am trying to accomplish, please DM me and I will send you my phone number and maybe we can clear all of this up in a quick phone call.

Thank you again for all of your help and please forgive my ignorance,

Mike