emulatorII-list

Hi
Be very careful with this. Please don't make the mods until you are
absolutely sure RS422 does not work properly.
Most Emulator II's work with RS422 with no problem.
Simple way is to check the serial number. 950 to 1100 may require the mod.

Regards
Rob

-----Original Message-----
From: emulatorII-list@yahoogroups.com
[mailto:emulatorII-list@yahoogroups.com] On Behalf Of Jeremy Campbell
Sent: 30 March 2009 14:42
To: emulatorII-list@yahoogroups.com
Subject: [emulatorII-list] Re: RS232/RS422


Ahh, I did not know it was also an issue with some rev 1s. Apologies.  
So if these mods were made already, I could just swap out the boards?  
Or would I just be able to use the connection jack? If they were not I  
would have to do steps 1-5 below? Is that correct?

Jeremy

> Hi, please note that not all Rev.1 digital boards had the needed
> mods to utilize the RS422 connection, and you might want to ask the  
> seller if they have been done already, or if he or the seller ever  
> used it along w/a Mac or CD-ROM set-up? Some Rev.1 digital boards  
> made it out w/ the mod done already, but some still require  
> modifications to be done. Emulator II's with Rev.1 digital boards  
> have the RS-422 drivers installed at the factory (IC's 108 & 132 of  
> the digital board). These will be an 8-pin IC vs. the 7-pin on the  
> Rev.0 boards. Rev.1 boards do not require the installation of an  
> additional RS-422 interface board (Mac Int PCB). However, due to E- 
> mu design changes several modifications are made at the factory to  
> allow the Mac and Emulator to communicate. Unfortunately, these mods  
> were not made at the factory to a number of Rev.1 Emulator II's.  
> Check to be sure that
> the following mods have been made to the digital board:
>
> 1. The trace leading to the end of R48 closest to the back panel has
> been CUT. R48 is immediately to the left of CN12, the 25-pin  
> computer connector.
>
> 2. The trace going to lC132, pin 10 has been cut. This may be
> difficult to see. The trace runs right next to the body of the IC  
> socket of IC1 32, on the right side of the chip, between the middle  
> and the bottom of the chip (quite near pin 10). If it has not been  
> cut, or you are not sure, then lift pini 0 of 10132 up out of the IC  
> socket so that nothing contacts it. Do this by removing the entire  
> chip from the socket, then bending pin 10 up and re-inserting the  
> chip into the socket. Pin 10 should not go into the socket.
>
> 3. If you do not have AT LEAST VERSION 2.3 of Emulator II OS
> software, then the following mod must be performed: Lift pin 22 of  
> IC107 and solder one end of a 1K ohm 1/4watt 5% resistor to it.  
> Solder the other end of the resistor to +5 volts DC anywhere nearby.
>
> 4. To improve data integrity, change resistor R47 on the logic board
> from 10K ohms 1/4W 5% to 1K ohms 1/4W 5%. Soldering a 1K ohm  
> resistor in parallel with the existing 10K ohm resistor at R47 will  
> also work.
>
> 5. Verify that the two internal EPROM's in the Emulator (MAIN and
> SCANNER) are AT LEAST Rev. 2.1. Verify that the Emulator II OS  
> software being used is at least Rev. 2.2.
>
> Cheers, emulator_island


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