How do i get the EII library from my PC into a MAC SE30?

[dr.c]

What do you mean by "top and bottom" ?

Gonna sleep, its 23:20 here.

Seya tomorrow

[dr.c]

Okay, I had a doubt, but this circuit is OK (see attached doc)
I have to find the other one...

[dr.c]

Hi,

As you can see, the 26LS32 and 26LS31 (attached) are complementary. One is ti SEND datas, the other one is to RECEIVE datas
The reason of the use of these circuits is simple : they change a +5 v signal to 12V (for example) and makes it balanced. At the end, the other decodes it.
It allows to send over capicitive cables and long distance. You can use it for MIDI, for example !!!

I've got the E2 diagram, but its rev 0, I don't have the modification diagram for Rev 1 !!!

Let me check !

[lennox]

thanks for your effort, i appreciate your help 

[dr.c]

Can you please dissassemble the wire you bought on the Emu side (not the emu connector, the one of the cable, note the pin numbers and send this here ? I want to trace this on the diagram.

[esynthesist]

My first Emulator II's RS422 also didn't work after I bought it.
Mine is a Rev 0 machine, so it had the additional board to add RS422 support instead of the original RS232.
This board is also based on the 26LS31 driver chip and 26LS32 receiver chip.

The problem was solved by replacing the driver (26LS31). This is a commonly available IC and it's very cheap.
My tech guy said that both ICs are not protected for electrostatic pulses on the DB25 connector's pins, so they can fail easily.

Just for your information, and for what it's worth: at that time I compared voltages on the DB25 connector pins between my bad EII and a good working EII. Here are the voltages of the GOOD working port (these are simple DC voltage measurements done with a multimeter)

* Measurement when EII is connected to the Mac (but not transferring data):
  - pin 11 (TXD+): +4.0 V
  - pin  3 (TXD-): +0.15 V
  - pin 10 (RXD+) +4.20 V
  - pin  2 (RXD-): -4.20 V
  (FYI: the BAD EII gave +0.12 V on pin 11 and +3.91 V on pin 3 - the other voltages where the same)
 
* Measurement when EII is not connected to the Mac:
  - pin 11 (TXD+): +4.5 V
  - pin  3 (TXD-): +0.15 V
  - pin 10 (RXD+) +3.50 V
  - pin  2 (RXD-): +1.40 V

I hope this helps.

///E-Synthesist

[lennox]

hi guys, i can't thank you enough for helping!

i located the other IC

IC108 is the receiver DS26LS32CN
IC132 is the Transmitter AM26LS31PC

perhaps its best to swapthese for new ones and see what happens, i hope to do this tomorrow

i keep you posted 

[dr.c]

Exactly, this is what I wrote previously :

According to the schematics, its IC108 (1489) et IC139 (4088).
Please try to find them and make a picture of each with what is around.
Sorry, but this is for YOU, its just to be sure at a 100% !

Even if we change them for nothing, THEY WILL die, soon or late, these circuits ALWAYS do, and they are standard ones, you find them anywhere there are connectors leading to to external world, like printers, modems, etc...

I can add that 26LS32 and 31 are National Semiconductors pin to pin replacement circuits to Motorola 4088 and 4089.

[lennox]

i found a shop nearbye exept that they don't have the exact matching type for the AM26LS31PC
they have some others with different end letters hmmm. i'm not sure wich one to take

here is the link to there website with different types wich one should be suiteble?

http://nl.farnell.com/jsp/search/browse.jsp?N=500012+1004477&Ntk=gensearch_001&Ntt=26ls31&Ntx=

thanks 

[dr.c]

This guy should change his job, sell frankfurters, for example.

These letters indicate the package and as well, the temperatures, look at the documentations !!!!

[lennox]

you are right about that he must change his job, he didn't bother to search for a matching type.

Good news is i found them at another store, they have the AM26LS31PC in stock the other type DS26LS32ACN (matching type i found out in the document you send) as well, should receive them tomorrow

I hope it works, i let you know

[dr.c]

Suffix PC stands for Plastic and Consumer, so not very good, if you can have CN for both Ceramic  and -55°C till +125C°, it would be better.

[lennox]

   installed the new ic's today and still can't communicate, this is getting on my nerves 

does anybody have other suggestions?

[dr.c]

can you try another Mac ? Or this mac on another E2 ? Another cable ? I do'nt know, I am not in front of the machine and even tough, I wonder...

I feel sorry not to be of any more help, but I would start from scratch and check everything.

First, take the damn Computer and cable and go to your friend to validate it.

After then, you can be sure it comes from the E-Mu.

[JMP]

Where are you located Lennox?