HEPAX/NoVRAM HOWTO?



#3

Hello all,

I'd like to get PPC into HEPAX. I have two 8192 byte ROM images. I have tried multiple attempts to get them on a diskette and read with READROM, but I get the following error: FL TYPE ERR

Using LIFUTIL I tried to force the TYPE to E070 (ROM41), but that did not seem to help.

How are others getting ROM images into HEPAX?

Thanks.


#4

Hi Egan,

I assume you have written your PC files (.ROM images in DOS format) into a 3-1/2 floppy by using LIFUTILS. The file itself will be copied into your LIF diskette but, as you've already noticed, the file type is not suitable to be loaded into HEPAX RAM (nor any other HP-41 peripheral for that matter).

The reason is that the HEPAX command "READROM" needs a file with a different format.

.ROM DOS files writes every single HP-41 word (10 bits) into a couple of bytes (16 bits), wasting the remaining 6 bits of every even word. Back in the late eighties when every byte was valuable (and expensive) wasting memory or mass storage space was by no means acceptable.

Therefore, the required ROM image files format for HEPAX "READROM" to handle it appropriatedly is much more compact, using the exact amount of bits required to hold the ROM image: 5.120 bytes.

Apart from that there are some few mods that must be made in the DOS->LIF procedure when running LIFUTILS as HP-41 file format is somehow "weird" from LIF standards point of view.

Keep an eye on your mail inbox.

Kind regards.

Diego.


Edited: 31 Aug 2008, 11:41 p.m.


Possibly Related Threads...
Thread Author Replies Views Last Post
  HEPAX Revisited: Revision 1E available Ángel Martin 4 642 05-03-2013, 01:57 PM
Last Post: Diego Diaz
  NOVRAM 64 / HEPAX bug? M. Joury 2 466 11-03-2012, 02:49 PM
Last Post: M. Joury
  Beta 41CL --> Best CL UTILs to burn in NoVRAM 64? Gene Wright 5 654 07-01-2012, 03:06 PM
Last Post: Matt Kernal
  NoVRAM 64 USB programmer Gene Wright 4 583 06-29-2012, 11:43 AM
Last Post: Diego Diaz.
  [41CL] CLUTILS HEPAX Kerem Kapkin (Silicon Valley, CA) 3 490 06-06-2012, 10:52 AM
Last Post: M. Joury
  NoV-64: The Incredible Shrinking HEPAX RAM Les Wright 31 2,441 05-27-2012, 08:48 AM
Last Post: M. Joury
  Non-HEPAX configurations for NoVRAM/NoV-32 Diego Diaz 1 360 02-07-2012, 07:27 AM
Last Post: Ignazio Cara (Italy)
  NoVRAM-M and NoV-32-M cgh 6 702 02-01-2012, 05:50 PM
Last Post: Richard Wagoner
  Getting HEXEDIT to work on the HEPAX itself Ángel Martin 1 328 01-29-2012, 06:42 AM
Last Post: Ángel Martin
  HP-41CL & NoVRAM/NoV-32 issue fixed... ;-) Diego Diaz 8 850 12-21-2011, 06:25 PM
Last Post: Diego Diaz

Forum Jump: