HPIL via USB : a propose for emulators



#2

Hi everyone (and excuse me for my bad english),

I think that all we (HP41/HP71/HP75 fans) will be in front of several troubles in the near future.

Indeed we are all migrating (before or after) our PC to the next generation of motherboard/cpu. So....goodbye ISA slot!! And.....goodbye HPIL PC interface!!!!! :-(((

And the PCI slots are going away too (will we have PCI-Express slots only???). Furthermore not all we will be able to maintain a second working PC for this purpose only.
So I think that we must think about some alternatives.

I suggest that a effective option could be a little and portable USB interface. With this little piece of hardware we could travel from one PC to another, with only our beloved HP's calculator and a USB-Disk with the wonderful Jean-Francois's "Emu41"!!

Despite my medium knowledge of hardware and software, I don't know if this is a possible way. But I'm sure that however we need some solutions!

What do you think about this idea?

And are there some people able to realize this?

(I haven't any doubt about Jean-Francois's and Christoph Klug's competence.....so if they want... ;-)

1234


#3

There is a company out there which produces for 100 USD an interface from ISA to USB in a nice little enclosure. I have forwarded their info already to Christoph for his expert opinion. here is a link to the product for those so inclined to check it out:
http://www.arstech.com/usb2isa.htm.

Cheers

Peter


#4

As I recall it, the HP-IL PC link card required, minimally, an 8-bit ISA slot on a PC.

So if your PC didn't have an ISA slot, you can't do HPIL anymore (unless there was a 3rd-party serial<->HPIL converter).

Also, this required an application+driver that I think runs only under a real DOS (not Windows emulation thereof).

If HPIL chips were available still, these could be wired to another small microcontroller (8051, 68HC05/11, PIC, MSP430, etc.) to achieve 'outside world' connectivity for HPIL.

As I recall, HPIL controller chips were really just programmed 8048? 8044? chips using some special features of their serial ports (addressability etc). There also must've been some analog line driver considerations too.
The firmware could probably be extracted from these chips and ported/modified to another CPU that had a similar very flexible serial port.


Bill Wiese
San Jose


#5

Quote:
As I recall, HPIL controller chips were really just programmed 8048? 8044?

All HP-made HP-IL peripherals, and most (if not all) third-party peripherals, used HP's custom CMOS 1LB3 HP-IL interface chip, or the 1LR4 which replaced it. The 1LB3 is an 8-bit peripheral chip with eight addressable registers. It is conceptually akin a UART, HDLC controller, FDC, or the like, except that the interface out the other side is HP-IL. The chip takes care of all of the HP-IL timing and much of the protocol.

The peripherals also all contain a microprocessor. HP variously used the MK3870, 8048, and 6809, though really any microprocessor or microcontroller could be used.

At one time, National Semiconductor was going to second-source the 1LB3 as the NSC851. A data sheet was published, but AFAIK the part did not actually get introduced.

Since the 1LB3 and 1LR4 have not been made for many years, they would not be a good design choice for any new HP-IL devices. Most of the equivalent functionality of the 1LB3 could be implemented today in a small FPGA (e.g., Xilinx XC3S50). A comparator for receive and an opamp for transmit would probably be necessary to meet the required waveshapes given in the HP-IL specification.

I believe I understand the HP-IL protocol and the 1LB3 operation sufficiently that I could implement the digital portion of an FPGA-based replacement, but I do not have time to do so unless I can come up with a way to make some money on it (e.g., if people would actually buy a USB-to-HP-IL interface box that would work with simulators).


#6

> (e.g., if people would actually buy a USB-to-HP-IL

> interface box that would work with simulators)

>

That sounds interesting:-)

I think 'd buy such an interface if it's somewhat affordable.

If only a modular win32 version of Emu41 would exist...J-F?

Regards

Raymond

#7

Good Idea but not an easy task!

One problem is that USB needs operating system support on the PC which is not available under (emulated) DOS. Emu41 runs under DOS and needs a major redesign to operate under Windows.

Would it be an option to attach HP-IL to an ordinary serial port? Serial interfaces should be quick enough for HP-IL traffic and can be replaced by USB/RS232 converters on newer machines. If the HP-IL needs power that con only be supplied by USB, the internal design could nevertheless be based on a regular COM port, i. e. the USB to RS232 converter could be part of the design. The main advantage would be that this port is still recognized by modern operating systems as a COM port, hopefully reachable from DOS applications.


#8

Hi,

there exist some HPIL-to-serial converters,

the most common is the 82164A box from HP,

and compatible devices from FSi and CMT.

But I don't know whether this device

can be controlled from the serial side.

However, there also exists another serial-to-HPIL interface,

which is actually controlled from the serial side.

It was originally made to help customers

to get their data files from an HP-IL device

into the HP-48SX, or in other words, as a migration tool.

For this task there is a special HP-48 library

which includes all the HP-IL module keywords needed.

I demonstrated that device on the 2004 Allschwill meeting,

where we sent data back and forth (both directions) between my

HP-48G+ and Jean-Francois Garnier's HP Portable Plus PC *via HP-IL*.

Before you ask: No, I don't have any further

technical info on this device except the user manual,

which only covers the keywords, not the technical aspect.

And the HP-48 library is nearly twenty KB in size,

with much code written in assembly language.

I think the best solution would be a portable USB-to-HPIL interface,

combined with a software layer which adapts Emu41's
HP-IL features to USB.

Regards

Raymond


#9

My concern about the use of RS-232 is that serial and parallel interfaces too ... are going away! :-(.

Perhaps not so quickly, but the motherboards manufacturers think that these are obsolete interfaces!

I think that the only actual interface that will have long life into ours PC is USB interface.

About the use of USB from DOS, I don't know if it's possible to do, but I remember that exists some programs. You can find them with Google searching for "usbaspi.sys" and in some pages at http://www.freedos.org/.

1234


#10

May be I missed the point, but I bought recently a USB2COM device to connect my HP200LX with my XP "abacus". The LX acts as server and the laptop acts like an HP-40G using Emu48. Of cause, Emu48 is not a DOS program, but why should a DOS-emulation _not_ be able to access the COM port?

Ciao.....Mike

#11

Claudio wrote:
My concern about the use of RS-232 is that serial and parallel interfaces too ... are going away! :-(.
Perhaps not so quickly, but the motherboards manufacturers think that these are obsolete interfaces! (end quote)

The consumer PC industry is tunnel-visioned on non-technical desk-top applications. I think they probably want the older interfaces to go away, and they certainly don't want to be bothered with any of us who have legitimate uses for something other than what they've dictated we should need.

Last year there was an editorial in one of the electronics industry magazines announcing that RS-232 was dead. I believe it was written by ECN's Aimee Kalnoskas. She got quite a flood of responses from people in industry telling why other options were not options at all for them in their work. She had to retract the "death certificate" she had written.

To respond to another post however, even though RS-232 does not have a dedicated power conductor, it definitely supplies enough power for running an interface converter to HPIL. I regularly use Radio Shack's mini tester with seven bi-color LEDs which get lit up plenty bright in spite of the fact that those older bi-color LEDs were very inefficient. The tester has never loaded the lines enough to be any problem to the data getting through. I have seen hand-held terminals advertised that were operated only on the power they scavenged off the RS-232 connection to the host computer.

I don't have any problem however with keeping an older computer along with the newer. I have two here, and use a switchbox to select which one the keyboard and monitor get connected to. (I do have two mice though.) I keep much of the important company work on the one that does not have internet access, which has proved extremely valuable when I was hit with a virus on a couple of occasions.


#12

Quote:
Last year there was an editorial in one of the electronics industry magazines announcing that RS-232 was dead. ..... She got quite a flood of responses from people in industry telling why other options were not options at all for them in their work.

Actually I have a lot of devices that are connected to the RS-232 ports. I have 3 switchboxes to use these devices!!

And I'm concerned about my next PC. Sure it will have only one RS-232 port!! :-(((

However I'm sure that like in the past, when consumer PC industry will decide to move from serial interface we will have no chance and no choice!! :-(((

1234


#13

You wrote:
"And I'm concerned about my next PC. Sure it will have only one RS-232 port!! :-(((
However I'm sure that like in the past, when consumer PC industry will decide to move from serial interface we will have no chance and no choice!! :-((("

Fortunately there will always be companies like Sealevel Systems, Inc. www.sealevel.com and B&B Electronics www.bb-elec.com who provide solutions to the kind of problems you're talking about, regardless of the computer's internal bus type. In fact, I just saw an ad for Sealevel yesterday showing their internal USB-to-RS232 converters that take a slot in the back of the computer but don't actually plug in to any bus. They're only suspended by the little sheet-metal thing that's at the end of normal plug-in boards. I think many of the solutions you'll find however are external, and so can be used even with a laptop that has no place to add a card.

#14

Last year there was an editorial in one of the electronics industry magazines announcing that RS-232 was dead. [...] She got quite a flood of responses from people in industry telling why other options were not options at all for them in their work.

If my HP-48G and my Olympus D-340R could talk, they'd have something to say about that. They are both in excellent health and their serial interfaces still run like a charm. :-)

I find it easier to live with a PC without USB than without RS-232...

#15

Quote:
Emu41 runs under DOS and needs a major redesign to operate under Windows

I have a dream... ;-)

An Emu41 version developed with wxWidgets that runs under Windows and Linux!!!

1234


#16

Quote:
I have a dream... ;-)
An Emu41 version developed with wxWidgets that runs under Windows and Linux!!!

Hmmm... how about a Nonpareil version (including HP-41 simulation) developed with GTK+ that runs under Windows and Linux?

Nonpareil currently supports the 41CV, but doesn't yet save state to disk. I'm working on that.

The Windows port of Nonpareil is now mostly functional.

#17

Quote:
An Emu41 version developed with wxWidgets that runs under Windows and Linux!!!

...and on my brand new Mac mini?

#18

Yep - good idea - great! I once met someone who is for sure able to do it, see here, his HP-41 has an USP port, since 12/31/2004. Nice!

Ciao.....Mike


#19

Exactly. if I recall correctly Meindert's MLDL-2000 will have the USB option already!!!

Best,
ÁM


#20

The MLDL2000 indeed has USB, but this is not an emulator but the real thing with USB!
So far USB can only be used for up- and downloading ROM images, but with the proper support on the HP41 (a ROM has to be made for this) is is pretty easy to exchange information between the HP41 and the PC, but this requires PC software as well, for example to 'simulate' mass storage or the printer.

BTW, I am waiting for a new quote from the PCB manufacturer to confirm pricing, and then the MLDL2000 will be offered to the community.

Meindert


#21

There exist two programs that act as IL-console via COM port from Hrastprogrammer. Then (IMHO) JF's emu41 and emu71 are quite advanced interfaces for IL signals to the PC paltform. So big parts of the puzzle are ready, we need just some glue to put them togehter.

Ciao.....Mike

Edited: 23 Mar 2005, 3:59 a.m.

#22

Yes, but it is not a IL device.

BTW, I'll buy a MLDL2000 as soon as it's available. Meindert - where do I have to queue up?

Ciao.....Mike


#23

Dear HP41 enthusiasts :-)

Thanks for your interest about HP-IL/PC interface card and about EMU41. You are right, a HP-IL / USB interface would be a future orientated system solution. May be there is someone in the handheld computer world, who creates such a modern solution. But up to now the old fashioned HP-IL/PC interface card is the proofed reference system for HP-IL / PC interfacing.

SOFTWARE :

Some different software tools exist for HP-IL / PC interfacing : The classic Link Plus and TRANS41 software and the fantastic EMU41 and EMU71 from Jean-Francois Garnier. Some handheld computer collectors run different software solutions for different handheld computer systems. The software packages above support HP41, HP71 and HP75. Furthermore EMU41 and EMU71 are able to control different HP-IL devices like IL-Plotter, IL-Voltmeter, IL-Mass storage and so on. A modern HP-IL / USB interface solution have to sum up the complete range of features form the well known software solutions above.

HARDWARE :

The actual users of the HP-IL/PC interface card own and uses some HP handheld computers : Minimal they have two handhelds available, in most cases some more machines, and some own a great number of handhelds. This users are advanced users, power users, enthusiasts, collectors, professionals and last not least also fans of nostalgic computer systems. This specific group of people have available some handheld computers – and also some PC hardware. For this group exist minimal one PC, which includes the needed ISA-Bus. If not, they buy an old PC including ISA-Bus from a garage buy next door for really less money. At the other hand, for professional PC users, the ISA-Bus is an industrial standard, which is supported also by modern industrial PC hardware. The reason behind this is, that much exotic industrial computer applications exist which includes ISA-Bus based hardware. This applications are running for much years, and there is no idea to change or replace them by new solutions. In fact there exist some professional / industrial applications, using the HP-IL/PC interface card for measurement, control and data logger applications, and for replacing handhelds by PC hardware.

CONCLUSION :

A modern solution like a HP-IL to USB interface would be nice to have, today the actual existing ISB-Bus based solution would be the reference solution. Remember that the group of handheld users and enthusiasts is limited – and most of them use the actual solution with great benefit and success. Therefore the story of the HP-IL/PC interface card also will go on to future times, and some more handheld computer enthusiasts will start to work with this solution. May be we get additional RS232 support for EMU41, this item have highest importance on the add on feature list for Jean-Francois Garnier.

With best wishes – Christoph Klug


#24

Quote:
today the actual existing ISA-Bus based solution would be the reference solution

I'm sure that this is real. I haven't any doubt that professional users will continue to use this standard solution, with ISA slots into their PC.

Quote:
For this group exist minimal one PC, which includes the needed ISA-Bus

Instead IMHO this is the problem. Enthusiasts and collectors HP users (not professional with HPIL data sampler, logic analyzer etc..), wants to use their calculators, but wants to upgrade their PC too. And not so much people can maintain active 2 computers (i.e. think at the space at disposal for our hobbies in our little houses...).

COM ports can be a good temporary solution, but IMHO only USB can be a long stable solution.

The final target would be a system exactly like the actual (Emu41 - HPIL emulation of mass storage/display/print - PC interface - HP Calculators) with the only change between PC interface and HPIL-USB interface.

Just my 2 eurocent... ;-)

1234

#25

Quote:
Meindert's MLDL-2000 will have the USB option already!!!

Please, don't forget HP71B and HP75C/D....

1234


#26

And pls don't forget, USB may vanish one day as the COM port did. BTW, consider, FireWire is faster.

Ciao.....Mike


#27

Quote:
USB may vanish one day as the COM port did

Sure, but USB is a technology that just now is in it's full expansion. So I think that we have a lot of years before that USB will be obsolete.

Quote:
FireWire is faster

FireWire too it's OK for me. Even if IMHO a fast transfer rate is full useless with a transfer rate like slow HPIL! ;-)

1234


#28

I wouldn't be too sure about USB hardware not becoming obsolete over night. I have seen in the CAD industry new hardware being supported by CAD software in the current version of the software, being unsupported in the next version of the software. Have you ever had to explain to your boss that the Top Of The Line $15,000 plotter that your company bought last year (which has only been in production for 2 years) is now unsupported by the $2,000 CAD software upgrade the company just bought? I had to do that once with a $2,000 digitizer not a plotter. But I thought the plotter would make a larger mental impact.

#29

Do not take all of my append too serious. I just discussed COM/USB/FierWire with a colleague and he mentioned the chance that there may be a change in future just to give the industry a chance to sell new devices.

Ciao.....Mike

#30

> Even if IMHO a fast transfer rate is full useless with a transfer rate like slow HPIL! ;-)

HPIL with the HP-71 was much, much faster than the standard RS-232 speeds (although now I've seen some RS-232 up to about 1Mbps), but modems in its heyday were generally 2400bps, IIRC. But who cared? Modems were mostly used for BBSs for plain text which you couldn't read as fast as a 2400bps link could bring you the info anyway. As long as we're not transferring bloatware (which our dear little HP handhelds hopefully will never have) or music files or large, hi-res graphics, HPIL should remain fast enough.


#31

Folks...

Mainstream PC hardware - both desktops and laptops - will increasingly have BOTH USB2.0 and IEEE1394 (Firewire) ports.
Most of this functionality will be included in the motherboard support 'chipset' - only the 'PHY' physical analog/line-level interface chips may be external.

Lower cost PCs may not actually bring the connector out of the motherboard, but the motherboard silicon will likely have these features. The amount of silicon area required for these in proportion to other features is minimal: most of the cost will be for the connector(s)!

Yes, you're seeing RS232 and parallel ports unfortunately being dropped. There will always be aftermarket PCI, USB, 1394, etc. cards + drivers available to support these necessary evils though. For PC peripherals like printers, scanners, disks, etc. a faster connection than what's offered by legacy connectivity (RS232, parallel) is very useful today though I'm not sure I'm fond of all the software layers + drivers involved (!!)

I do note that quite a few RS232-via-USB converter widgets do have some problems and that some are much better than others. If one doesn't work for you in your application try another that uses a different brand of chip. [A variety of these products from different mfgrs sometime all use the same chip!]

I myself am a fan of ethernet - and silicon is getting cheap. If I had things my way, every non-keyboard/non-mouse device would be a 'smart' web-enabled device on ethernet, have its own webpage+webserver for configuration, etc. PCs would have built-in ethernet switches/routers and local devices (printers, ext. disks, etc.) could be on a separate tree from external connectivity links.


Bill Wiese


#32

Quote:
I myself am a fan of ethernet

Same here. I'd be much more interested in an Ethernet-to-HP-IL interface than a USB-to-HP-IL interface.
Ethernet has many advantages over USB.


#33

Quote:
Ethernet has many advantages over USB.

But in its standard configuration it doesn't supply power to the devices, the cables are stiff and RJ connectors aren't built to last for years :-(

Ethernet is OK for stationary equipment (PCs, printers, routers, PBXs and the like) but not for the standard peripherals (keyboard, mouse, HP-41C).

Could Bluetooth be a better solution? It's not very power hungry, would fit in a standard HP-41 expansion housing, ...

#34

Quote:
------------------------------------------
I myself am a fan of ethernet
---------------------------------------

Same here. I'd be much more interested in an Ethernet-to-HP-IL interface than a USB-to-HP-IL interface. Ethernet has many advantages over USB.


USB is pretty brain-dead and too complex. I've been dealing with some 1394 stuff (RAM disk prototype) and it's more graceful - though the PC 1394 driver can be a bit lame.

My dream: Ethernet everything.

Bill Wiese

San Jose

#35

Quote:
HPIL with the HP-71 was much, much faster than the standard RS-232 speeds

Not really. Typically the best you could get about about 50 Kbps, while serial ports at that time would commonly work at up to 115.2 Kbps.


#36

My understanding was that HP-IL with the 71 could do 5,000 data bytes per second, not including overhead bytes, and that the IL spec. limit was 8,000 bytes per second. The "standard" RS-232 speeds I was referring to were the 19,200bps and down that you could specify in the DOS "MODE" command, for example, MODE COM1:9600,N,8,1,P

The HP-41 could only do about 150 bytes per second on HP-IL IIRC.

#37

I'm happy to see that perhaps this is one of the most interesting matters for HP's calculators enthusiasts.

I can see from all these posts that exist several and valid proposals:

  1. ISA-USB adapter;
  2. HPIL-USB interface;
  3. HPIL-COM adapter;
  4. HPIL-Firewire interface;
  5. HPIL-Ethernet interface;
I'm not full convinced about the simplicity and the portability of the solutions number 1 and 5.

My preference is still for HPIL-USB interface, however IMHO the most important thing is that someone realizes one solution, and not the kind of solution.

So I propose to do a little game: we can declare our preference and our availability to pay some money for a solution that allows to work exactly like the actual Emu41 with the HPIL-PC interface.

I'm available to pay some money like 50 Eur for a Windows/Linux software like Emu41 with HPIL emulation via USB. And I'm available too to pay other 50 Eur (more or less) for a simple HPIL-USB interface.

1234


#38

Dear HP-IL enthusiasts,

I am really enjoyed about the great response of members of the HP-Museum forum about IL/PC interfacing. I think, most of the users, who are discussing this subject are also active users of the EMU41 & HP-IL/PC interface card solution. Seems to be, that handheld computer / PC interfacing have a key function for the today activities of handheld computer enthusiasts :-)

Remember, that a new and modern IL/USB hardware solution also have to replace the classic IL-Transformer and IL-Chip by using modern hardware parts. Furthermore the wanted Windows version of EMU41 would include a complete new software development process. Therefore the whole project grow up to high dimensions - independent of the realised interface type like USB, Firewire or something else, which is acting as gateway to PC world.

Comparing the future hardware design of the IL/USB interface with actual hardware projects like CLONIX, NoVRAM or MLDL2000, the price for an IL/USB interface would be placed in the range of 200 Euro. May be there exist a small group of 20 people up to maximally 50 people worldwide, who would take and use a future IL/USB interface solution ???

Last not least – anything you can do with this future hardware & software system solution, is already available today. You only need the reference EMU41 & HP-IL/PC interface card plus low price PC hardware, which includes the old fashioned ISA-BUS…

With best regards – Christoph Klug


#39

Hello all,

I think I have to give my own point of view regarding this interesting discussion.

My first level answer is that if you have some interest in old calculators and computers (especially HP, like me), you *should* have an old PC with ISA capability. I personnally still use my early HP Vectra (286@8MHz) for this purpose. So I share Christoph's opinion that the current ISA board should be the prefered solution for most of us involved in old hardware.

BUT I can understand that it would be convenient to have physical HPIL capability on modern PC without ISA support. Since a long time I think to develop a smart RS232/HPIL converter to let a computer (whatever type or OS) controls the HPIL from any serial port. From the discussion I see now that USB would be a better choice, but I don't have any plan to support USB.

Be sure that I'm thinking to solutions, and I may have some news for all of you in the next months!

Best regards to all!

Jean-Francois


#40

Dear Jean-Francois,

Thanks a lot for your statement about HPIL/PC interfacing. Because I am realist, therefore also for the next time we take EMU41 as the reference. At the other hand I am also a creative and fantastical dreamer or visionary, actual I prefer small steps of progress. Therefore implementing basic RS232 features to EMU41 would be a great support from your side. We discussed this item about future software features for EMU41 during the last Allschwil meeting.

By using the HP-IL/RS232 interface we get an alternative transfer gateway between PC and handheld computers – independently of the HP-IL/PC interface card. May be, in a second step it would be possible to expand this new link also by a RS232/USB interface, helpfully for modern laptop or notebook PC´s.

With best wishes for Eastern – Christoph Klug

#41

Quote:
Be sure that I'm thinking to solutions, and I may have some news for all of you in the next months!

This is like heavenly music for my ears! :-)

And I confirm you that a RS232/HPIL converter too will make us very happy!!!

1234

#42

I think that is a fabulous idea, I'm in as well for the same solutions (some way to connect HP to PC via USB) and the same amounts (50 Euro).

While I agree with Christoph about the availability of ISA on an old computer, I'd like to throw in a couple additional thoughts:

1) For no appearant reason (maybe it has to do with the shoe-box sized appartments in New York) the female member of the househald (aka 'The Boss') has strong objections against wire and techno creep in our place. While I get already trouble for a thing the size of the HP 41 ("Why do you need two of them? Only because one has a C and the other a CX? here, I draw an X on the firts one...") I can't imagine the brownie points I'd loose for logging in a second computer ("So this one is much faster than your curren one? no honey. But it has better software? No honey. it helps me cooking? No honey...)

2) I actually use my HP for work and I do travel with my laptop. So I'd really like to be able to have a way to connect the HP to my PC while traveling. For play and also for work (e.g. I'd like to use the PC to download prices of securities from the internet and send it over to my HP as I need them in calculations). So for that a HP-IL to USB interface would be fabulous.

Again, notwithstanding the very sensible arguments from Christoph and others, just thought I throw out a couple more points to ponder.

Cheers

Peter


#43

I like this discussion. After all, I seem to be the first who really has connected the HP41 to USB ;)

The big question here is: what do we want the USB to do, or better: do we want a USB Host interface (very complicated, especially in software) or a USB device (very simple). For example controller a USB printer from a calculator will require a very complex software stack.

When developing the MLDL2000 I wanted to have just a fast, cheap and easy conection between the HP41 and the PC world, so the PC could take care of printing, storage, backup etc. The MLDL2000 used an FTDI 2232C chip that comes with free drives, example programs and a very simple interface to any hardware. It costs about EUR 8 in small quantities, an small EEPROM, XTAL and a few R's and C's. There is hardly any software required on the '41, and the PC software is not extremely complex. I just cannot connect a memory stick, printer, USB disk drive or my digital camera to the HP41.

A USB device to HP-IL would be pretty simple and not exensive at all. Christoph should be able to give an idea of the cost of the IL part.

Before we make something, let us first find out what is has to do.

BTW, I like Ethernet too, just a bit more power hungry than USB, because USB can be powered from the cable ....

Meindert


#44

Coding of the needed USB host driver is a hundred times harder project than a simpler USB client.

USB can also bring power to the needed hardware.

Let the PC do the hard work.

Maybe it can simulate a new mass-storage device?

(1TB floppy? :)

[VPN]

#45

Hi Meindert, can you explain me more details about the FTDI 2232C driver in direct (D2XX) driver modality?

(remove the double "_NOSPAM_" from my e-mail address.)

Thanks

1234


#46

Claudio,

The FTID website has some information, appnotes and programming examples. For communication with the MLDL2000 I use the FT2232 in MPSSE mode through the D2XX driver. The specification of the MLDL2000 explains the timing in some detail.

Meindert

#47

Quote:
1) For no appearant reason (maybe it has to do with the shoe-box sized appartments in New York) the female member of the househald (aka 'The Boss').......

Hi Peter and ... thanks very much! You have give me 5 minutes of laughs. :-D

And you have confirmed me that the it's the same music in all the world!!! ;-)

1234

#48

This is a very interesting discussion topic for me, and I agree that we need to define the use for an interface.

I would be very interested to buy either an HP-IL to USB or HP-IL to RS232.

My use would be to transfer programs and data files between the PC and my HP-71B (also HP41). If I could also use the PC printer direct from the 71B then that would be a nice bonus.



So if anyone is willing to develop the interface I will buy!


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