LJ Electronics Emma 2

[BigEd]

As a reference and an FYI, I found someone with an Emma board and with the information that LJ Electronics is still active but now called LJ Create:
http://www.anf.nildram.co.uk/beebcontro ... /emma.html
http://www.ljcreate.com/About/index.asp
http://www.ljcreate.com/products/factsheets/p5430.pdf
(It's possible they still have documentation for their earliest products)

[g4gya]

I have an Emma 11 but it has no monitor chip in the socket
i have an eprom programmer and a blank 2716 but no code
to put on it
help much appreciated
roy

[marian]

Hello cheekyfox John

Are these manuals scanned and available somewhere? Those will be really helpful.


Thanks
Marian

[BigDumbDinosaur]

marian wrote:

Hello cheekyfox John

Are these manuals scanned and available somewhere? Those will be really helpful.


Thanks
Marian

cheekyfox hasn't visited here since May 2016.

[BigEd]

BigDumbDinosaur wrote:

... hasn't visited here since May 2016.

♬♪♫ You can check out any time you like, but you can never leave... ♫♪♬

[marian]

Where these books eventually scanned ? I don't see any more updates on that regard ...


Thank you.

[marian]

Thanks. I just saw the previous updates. Can't we find his email address ?

[BigEd]

Cheekyfox will have already have got a notification from the forum when you woke up the thread.

[BigEd]

See also this later thread - not that there's any definitive answer anywhere I can see:
viewtopic.php?f=4&t=3703

[BigDumbDinosaur]

BigEd wrote:

BigDumbDinosaur wrote:

... hasn't visited here since May 2016.

♬♪♫ You can check out any time you like, but you can never leave... ♫♪♬

Funny! When I posted my message I was thinking the same thing.

[marian]

Thanks a lot for spotting the other thread. I could at least download emma2_manual.pdf from there.

Regarding the email. Well...if we know that his email address is not working anymore then we can drop the idea of waiting for any replays.

[jaevans]

Greetings all,

I recently obtained an EMMA II board and, like other owners, am dying for documentation. The only potential leads I've located are :

1 - store.lathes.co.uk seems to be selling the Experiment Manual and the Technical Manual for 55 pounds each - pricey for sure.
2 - a lab manager at Southern Illinois University in Edwardsville, IL - Steve Muren - may be the one who used to host the copy of the User Manual that is floating around.

Someone here mentioned that they were working on a disassembly of the monitor ROM - that would be a great place to start. Also another poster began a schematic of the board, at least of the address decoding section - would be nice if that were available.

What I would love right now would be a way to serially connect to the board for uploads and downloads.

Film at eleven.

John - Colorado Springs, CO

[jaevans]

Hello folks,

OK, I've located and obtained a scan of the EMMA II Technical Manual. I emailed the POC here to see if the document can be stored at 6502.org and am awaiting a reply. The document is 112 pages plus cover and contents and is large at 50MB. I am sure folks will be interested in this document, for sure.

Also, I have not located a detailed schematic for the board (the technical manual has sheets 1 and 3 of the schematic and a low resolution image of the address decoding circuit) so if anyone ever locates a complete set, I'd appreciate that if it were shared. Also, I have the addon/external Memory Expansion Module and would like technical data on it - it has room to add 6116 RAM chips and 2716 EPROMs, plus it has an on-board EPROM programmer with an EPROM that seems to be dedicated to programming EPROMS. I can get the program to start and it lets me enter a start and end address for data to be programmed into the EPROM but I can't seem to get it to do anything.

I also was able to dump the code from both EPROMS (SE 116/A, D8-DD, FE-FF on the EMMA II board and SE 118/A. 90-97 on the Mem Exp Module). I can provide binary or hex dumps from both EPROMS. Disassembling code from the Mem Exp Module EPROM will be a task, but should help in figuring out how to use the programmer.

John

[8bitstedy]

jaevans wrote:

Hello folks,

OK, I've located and obtained a scan of the EMMA II Technical Manual. I emailed the POC here to see if the document can be stored at 6502.org and am awaiting a reply. The document is 112 pages plus cover and contents and is large at 50MB. I am sure folks will be interested in this document, for sure.

Also, I have not located a detailed schematic for the board (the technical manual has sheets 1 and 3 of the schematic and a low resolution image of the address decoding circuit) so if anyone ever locates a complete set, I'd appreciate that if it were shared.

John

Hi,

I'm a newbie here, found this site and topic whilst on a 6502 nostalgia trip. Used to use the Emma II between 1993-1995 when I was at college here in the UK. 22 years later, I still have the boards and a stack of manuals.

I have the schematics, extracted from the 118 page technical manual. Enjoy, http://www.ianstedman.co.uk/downloads/E ... matics.pdf (909KB)
I also have the technical manual, http://www.ianstedman.co.uk/downloads/E ... manual.pdf (18 Mbyte)

I have not scanned these manuals but can do it if there is interest:

• Emma II users manual
  Microprocessor application system MA04/1 Experiment manual.
  Microprocessor application system MA02/1 Experiment manual.
  Microprocessor fault simulation and diagnosis expansion system MA08
  These manuals for various plugin modules have code listings within;
  A/D converter MS3
  Relay module MS13
  Strain gauge module MS13
  Stepper motor MS4
  Buffered loudspeaker MS6
  I/O port monitor MS12

If the server bandwidth is not too nigh, I can host the manuals on my website, will monitor the traffic but I am happy to share them.
Finally some hardware pron

6502.org wrote:

Image no longer available: http://www.ianstedman.co.uk/downloads/Emma_II-small.jpg

6502.org wrote:

Image no longer available: http://www.ianstedman.co.uk/downloads/Emma_II_Modules_1-small.jpg

6502.org wrote:

Image no longer available: http://www.ianstedman.co.uk/downloads/Emma_II_modules_2-small.jpg

[BigEd]

Fantastic! (And welcome)

I know Mike will be more than happy to put up this material, or a mirror if you put it up.

This machine was evidently fairly widely used in U.K. Education but has faded to invisibility.