HP 110 Plus / HP Portable Plus Resource Page


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I present here some personal material for the HP 110 Plus or Portable Plus:

Using the PIL-Box with the Portable Plus

The PIL-Box is working great with the Portable Plus:

With the ILPer software on PC, it is possible to access disc image files on the PC as the discs C: or D: on the Portable, and print to the 'Printer' window of ILPer.

·        Disc C and D: To enable the discs C: and D: set 2 external drives in the PAM system configuration.
In ILPer, choose a MS-DOS disc image file.
Note that ILPer asks for 'LIF' file types, don't worry about that. I recommend to use the .DAT extension for DOS-formatted images used by the Portable to differentiate them from the LIF images used by the HP41C, 71B and 75C.

·        Printer: The printer interface should be set as HP-IL in the PAM system configuration (this is the default).
Any output to the printer will appear in the ILPer 'Printer' window.
For instance, to list the content of the c: directory from the DOS command line, do dir c: >prn

·        The DOSLink device has no use with the HP Portable Plus.

·        Important note: the name of the first drive of ILPer must be changed for operation with the Portable Plus: in the ilper.vil configuration file, change the ID$ parameter of the [Disk1] section to "ID$=FDRIVE1" instead of "ID$=HP9114B". See the ILPer documentation for more details.

I recommend to use the latest PIL-Box firmware (2.1 or later) in 230 kbps speed mode (jumper JP2 removed), due to the large amount of data exchanged between the Portable Plus and the drives during mass storage operations.


MS-DOS formatted disc image templates for ILPer:

The Portable Plus built-in format command can only create 128KB disc image with ILPer because the Portable Plus assumes the mass storage unit is a HP82161 cassette drive.
The Portable can access larger MS-DOS drives, however the "Filbert" protocol used by ILPer limits the size of disc images to 16MB.
Templates of 1MB, 4MB and 16MB disc images are provided below:

HDRV_PP  : 1MB, 4MB and 16MB MS-DOS formatted disc image files (empty) for ILPer versions 1.5x and 2.x.
The 1MB volume provides a flexible way to share data with other software using disc images, such as DOSBox.
The 4MB volume is a good trade-off between access time and capacity.
The 16MB volume offers the maximum capacity, but at the expense of a (relatively) slower access time due to the large FAT area. It is noticeable for instance at the end of the DIR command when the remaining disc capacity is computed from the FAT.

HDRIVEPP : 640KB MS-DOS formatted disc image file (empty) for ILPer versions before 1.5 that were limited to 640KB.

hdrive models : definition files used to build the 640KB, 1MB, 4MB and 16MB disc image files.

Disc images files for the Portable Plus:

Here are the first disc image files I can provide. They come from EPROM sets I built in the past (these EPROMs are also available as binary image below)

·         UTIL1 :
This is a collection of utilities I was using at the time.
  burn, edisk, image: are the HP tools to build EPROM. See the doc below.
  clockprg: is a big, nice analog clock. <Halt> to exit.
  fonts: displays the 3 character fonts of the Portable.
  heebie: is a little game (from HP, I think).
  kermit: is the portable version of the well-known Kermit communication software.
  scope.bas: is a program in basic (done by me) to monitor the hp-il (scope). You need the basic interpreter.
  term71: is my Term71 utility (see below).
  z: is an vi-like editor (if you know the Unix VI editor). <esc :q!> to exit (I mention it cause it's not obvious…).

·         XCMDS1 :
This is a collection of several DOS commands that I found useful. Some are French-localized.
  dump: a simple file dump utility (I don't remember where it comes from).
  fa, qu, si: from an old Norton utility pack. I liked the si utility.
  filetrans: HP file translation utility to convert documents
    between HP Roman character set (used by the Portable) and IBM PC character set. In French.
  mfree: simple utility to report the amount of free memory.
  off: turn off the portable from the DOS command line.
  symdeb: symbolic debugger (advanced version of debug).
  xdir: extended dir. In French.

·         EMU41P :
Emu41p is the Portable Plus version of my Emu41 emulator that I used to provide as an EPROM set (see below), it is now freely available.
This disc image holds the exact content of the Emu41p V2.4 EPROM set, refer to the Emu41p documentation for details.


Portable Paper Subscriber Discs:

Here are the image files of the Portable Paper Subscriber Discs (see below) ready for use with ILPer.
The content of these discs have been limited to 640KB for ILPer compatibility, by keeping only the Portable/Portable Plus relevant files (files for the HP Vectra, LS12, or Vectra portable have been removed):

·         PPSD88 : Portable Paper Subscriber Disc 1988

·         PPSD89 : Portable Paper Subscriber Disc 1989

·         PPSD90 : Portable Paper Subscriber Disc 1990

·         PPSD91 : Portable Paper Subscriber Disc 1991

The documentation of the content of these discs can be found in the Portable/Portable Plus Software section of the hpmuseum.net.


Other disc images:

More Portable Plus programs can be found in this HP Museum article.


Emu41p: an HP41 emulator for the HP Portable Plus

Emu41p is a special version of my Emu41 emulator for the Portable Plus. It uses an optimized, assembly language simulation engine that provides similar speed performance than a slightly accelerated HP-41C.



     Emu41p EPROM set                              Emu41p EPROM set installed in the HP Portable Plus Software Drawer

You will find mode details in the installation and user documentation:
Emu41p EPROM set installation and user notes (pdf file)

See my Emu41 page for more information on Emu41.



EPROM images

Here are the binary images files of my personal EPROM sets, corresponding to the LIF disc image files above.

·        UTIL1

·        XCMDS1

·        EMU41P

The images are to be burned in two 27C512 EPROMs and installed in a high/low socket pair in the ROM drawer.

These files are provided "as is". I can’t provide any help on how to burn your own EPROMs.




Term71 Utility

Term71 is a small utility I wrote 30 years ago ... With Term71, you can use your HP Portable Plus as a display and remote keyboard for your HP-71B.
Term71 is included in the Emu41p EPROM set as a free bonus.
It is now also available in the UTIL1.DAT disc image file for loading using the PIL-Box/ILPer.



I lost the source file several years ago, but I recently rebuilt the assembly language source file from the binary code that was kept in a custom EPROM set in my HP Portable Plus. The source file is now freely provided with Term71.

·        Term71 Utility for the HP Portable Plus (free).

Tools and Documentation

·        Tools Tools to build custom ROM for the HP Portable Plus.

·        Makerom Custom ROM utilities documentation.

·        HP110drawer Expansion Drawers Configuration.

·        HP110config Software Module Configurations.

·        Vger Detailed Image Package Documentation.

·        TechRefManual Technical Reference Manual (TRM) edition 2, Dec. 86.

·        TRM_Add TRM Additions and Clarifications, Oct. 85.
This document is already taken into account in the TRM edition 2 but makes clear what are the changes and ROM A bugs.

·        Bugs HP Portable Plus bug list as of 5/85 (supposed to be applicable to ROM A version).

·        ServiceManual Service Manual, March 87.



HP Portable Plus Training



Here are the presentation slides of a training given in HP Grenoble (France) in 1985 or 1986:

·        Introduction: general information on the Portable Plus: features, target market, …

·        Peripherals: PDL (Portable Desktop Link), Mass Storage, Peripherals

·        Hardware and Assembly Language (with notes)

·        System Software (with notes)


The Portable Paper Users Newsletter

The Portable Paper Newsletter is an outstanding source of information on the Portable Plus.

       Portable Paper Index (1986-1989)

The issues of the Portable Paper newsletter are hosted on the HP Computer Museum.



·        www.hpmuseum.net/display_item.php?hw=49 Portable Plus page with documentation

·        www.hpmuseum.org/software/swcd.htm HP 110 (Plus) documentation on MoHPC's DVD (search for 'HP 110')

·        www.blinkenlights.com/classiccmp/hp150faq.txt Some information on the HP 110 Plus

·        www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/hpjindex.html#1986  HP Journal issue on HP Portable (Plus) - July 1986

·        www.hpmuseum.org/forum/thread-1788.html Portable PLUS Programs on disc images for use with the PIL-Box and ILPer



If you want to have more information on the Emu41p EPROM set, please contact me :

J-F Garnier, 2017