Threaded Mode | Linear Mode

Ken S · 03-28-2020, 12:14 AM

Hi all,

I recently picked up a lot of what are described as HP41 eproms. I picked them up cheaply enough that if I can't do anything with them it is not a big deal. It looks like like the eproms came with seperate upper and lower banks and the lot appears to have images of the following roms:

FORTH41
MC EPROM
NFC ROM
ASSEMBL
ASS3
ASS3 BURN
BLDROM
DACROM
DAVID ASSEMBLER

So do images of all of these already exist? If not is there any way to extract images of these?

**rprosperi** · 03-28-2020, 12:31 AM

(03-28-2020 12:14 AM)Ken S Wrote: I recently picked up a lot of what are described as HP41 eproms. I picked them up cheaply enough that if I can't do anything with them it is not a big deal. It looks like like the eproms came with seperate upper and lower banks and the lot appears to have images of the following roms:
[snip]

You got the lot pretty cheap, even for empty EPROMs, Wink

Several of these are long available (FORTH41, David Assembler) but it's hard to say about many of the items as the names shown are not exact matches for usual ROM names, though the contents may be.

Do you want to extract the images directly from the chips using normal PC-based tools, or do you want to extract them on a 41, in which case you will need one of the vintage EPROM carrier devices that plug in to a 41 port, and one of the advanced 41 modules like the HEPAX, ZenROM, etc.

Ken S · 03-28-2020, 12:50 AM

Whatever is simplest to create Rom images which could be used with a 41CL or with a hepax module or its equivalent.

Paul Dale · 03-28-2020, 04:19 AM

I've got an EEPROM module for the 41 (ZEPROM) which is blank and I've no programmer. Anyone want to make an offer for it? Obviously I've no way to test that it still programs. The 1, 2, 3 & 4 annunciators light up on boot with it in a calculator. Otherwise, I've very little idea about it.

Pauli

Sylvain Cote · (This post was last modified: 03-28-2020 03:36 PM by Sylvain Cote.)

(03-28-2020 12:14 AM)Ken S Wrote: I recently picked up a lot of what are described as HP41 eproms.

The EPROM lot you got are programmed in U2L8 format that was used by most MLDL/EPROM boxes between 1980 & 1985.

Here is a slide which is part of my HHC2020 presentation (if there is one) that show the format.
[Image: eprom_ul_fmt.jpg]

Sylvain

Sylvain Cote · 03-28-2020, 03:35 PM

(03-28-2020 04:19 AM)Paul Dale Wrote: I've got an EEPROM module for the 41 (ZEPROM) which is blank and I've no programmer.

PM sent!

Ken S · 03-28-2020, 06:28 PM

(03-28-2020 03:21 PM)Sylvain Cote Wrote:
(03-28-2020 12:14 AM)Ken S Wrote: I recently picked up a lot of what are described as HP41 eproms.
The EPROM lot you got are programmed in U2L8 format that was used by most MLDL/EPROM boxes between 1980 & 1985.

Here is a slide which is part of my HHC2020 presentation (if there is one) that show the format.

Sylvain

Thanks Sylvain,

I will keep an eye out for one of those. In the mean time if anyone who has one of those boxes has an interest in extracting any of the roms let me know. I would be happy to ship them.

Ken

Sylvain Cote · 03-28-2020, 07:07 PM

Hello Ken,

I have found these on TOS and in 41CL ROM update file:

BLDROM : Builder ROM from W.D.Wilder
DAVID ASSEMBLER : ES84081B David Assembler for MLDL boxes from Eramco Systems
FORTH41 : FORTH for HP-41 from Serge Vaudenay
MC EPROM : for use with MC00506A HP-IL EPROM Programmer from Mountain Computer
NFC ROM : for use with ProtoCODER, ProtoEPROM, etc boxes from ProtoTECH

Still searching for these:

ASSEMBL : another assembler ?
ASS3 : probably Assembler 3
ASS3 BURN : a variant or extension of Assembler 3 ?
DACROM : Data Acquisition & Control ROM ?

I have several EPROM boxes compatible with these EPROMs, I could easily extract the ROMs and see if you have acquire a lost ROM.
If you have somebody in USA who can do it it is easier for you, otherwise I can do it, I live north of Montreal, Quebec, Canada.

Sylvain

Ken S · 03-28-2020, 08:05 PM

(03-28-2020 07:07 PM)Sylvain Cote Wrote: Hello Ken,

I have found these on TOS and in 41CL ROM update file:

BLDROM : Builder ROM from W.D.Wilder

DAVID ASSEMBLER : ES84081B David Assembler for MLDL boxes from Eramco Systems

FORTH41 : FORTH for HP-41 from Serge Vaudenay

MC EPROM : for use with MC00506A HP-IL EPROM Programmer from Mountain Computer

NFC ROM : for use with ProtoCODER, ProtoEPROM, etc boxes from ProtoTECH

Still searching for these:

ASSEMBL : another assembler ?

ASS3 : probably Assembler 3

ASS3 BURN : a variant or extension of Assembler 3 ?

DACROM : Data Acquisition & Control ROM ?

I have several EPROM boxes compatible with these EPROMs, I could easily extract the ROMs and see if you have acquire a lost ROM.
If you have somebody in USA who can do it it is easier for you, otherwise I can do it, I live north of Montreal, Quebec, Canada.

Sylvain

If you think it is worth your time to extract them I would be happy to send them to you. I will pm you.

HP-Collection · 03-29-2020, 07:16 AM

I suppose it will be easier to determine the EPROMS if you publish the CAT2 entries.
On my website you can determine the contents afterwards:

http://www.hp-collection.org/41database.html
Matthias

PS: We are all eagerly awaiting your answer.

Sylvain Cote · (This post was last modified: 03-29-2020 12:15 PM by Sylvain Cote.)

(03-29-2020 07:16 AM)HP-Collection Wrote: I suppose it will be easier to determine the EPROMS if you publish the CAT2 entries.

Since he does not have a U2L8 style EPROM box, unfortunately that option is off the table for now.

twdeckard · 03-30-2020, 09:21 PM

(03-28-2020 06:28 PM)Ken S Wrote:
(03-28-2020 03:21 PM)Sylvain Cote Wrote: The EPROM lot you got are programmed in U2L8 format that was used by most MLDL/EPROM boxes between 1980 & 1985.

Here is a slide which is part of my HHC2020 presentation (if there is one) that show the format.

Sylvain

Thanks Sylvain,

I will keep an eye out for one of those. In the mean time if anyone who has one of those boxes has an interest in extracting any of the roms let me know. I would be happy to ship them.

Ken

Did you see this:

https://www.ebay.com/itm/LOT-HP-41CX-cal...SwClNef1-e

Sylvain Cote · (This post was last modified: 03-30-2020 11:49 PM by Sylvain Cote.)

(03-30-2020 09:21 PM)twdeckard Wrote: Did you see this: ... EPROM module ...

No I did not, the auction effectively contains an HHP-PE unit that is compatible with U2L8 format.
I cannot bet on it because it is a USA only auction, but you or Ken could.

Some pictures of my HHP-PE (Hand Held Products Portable EPROM) unit.
[Image: HHP-PE-P1.jpeg]

**rprosperi** · 03-31-2020, 12:45 AM

(03-30-2020 09:21 PM)twdeckard Wrote: Did you see this:

https://www.ebay.com/itm/LOT-HP-41CX-cal...SwClNef1-e

Seller will not split the listing, been there, tried that...

Ken S · 03-31-2020, 01:15 AM

If it doesn't go ridiculously high I will take a shot at it.

Sylvain Cote · 04-04-2020, 03:03 PM

(03-31-2020 01:15 AM)Ken S Wrote: If it doesn't go ridiculously high I will take a shot at it.

I saw the auction ended, did you win it ?

Massimo Gnerucci · 04-04-2020, 03:23 PM

Glad it ended @ only $290.50.
Maybe next time they will reconsider their 'USA only' exclusivity.

Sylvain Cote · 04-04-2020, 03:25 PM

(04-04-2020 03:23 PM)Massimo Gnerucci Wrote: Glad it ended @ only $290.50.
Maybe next time they will reconsider their 'USA only' exclusivity.

I will not put any of my money on this bet! Wink